Tag: 200-300

Effect of polymer matrix on the performance of pressure-sensitive paint comprising 5,10,15,20-tetrakis(pentafluorophenyl)porphinato platinum(II) and poly(1,1,1,3,3,3-hexafluoroisopropyl-co-tert-butyl methacrylates) was written by Obata, Makoto;Asato, Ryo;Hirohara, Shiho;Mitsuo, Kazunori. And the article was included in Journal of Applied Polymer Science in 2016.Quality Control of 1,1,1,3,3,3-Hexafluoroisopropylmethacrylate The following contents are mentioned in the article:

Copolymers of 1,1,1,3,3,3-hexafluoroisopropyl methacrylate (HFIPM) and tert-Bu methacrylate (TBM) were prepared by conventional radical copolymerization as a novel binders for pressure-sensitive paints (PSP). The monomer reactivity ratios r_HFIPM and r_TBM were determined as 0.45 and 0.67, resp. The glass transition temperature of the copolymers increased from 77 to 126°C with increasing mole fraction of TBM units in the copolymer. The PSP were formed by combining the resulting copolymers and 5,10,15,20-tetrakis(pentafluorophenyl)porphinato platinum(II). The pressure and temperature sensitivities of the PSPs were measured at air pressures ranging from 5 to 120 kPa and at temperatures ranging from 0 to 60°C. Modified Stern-Volmer plots indicated slight increases in the pressure sensitivity, but significant decrease in the temperature sensitivity as the mole fraction of HFIPM units increased in the copolymer. Applying a theor. model to our calibration data, we inferred that luminescence quenching is primarily responsible for increasing the temperature sensitivity in the resulting copolymers. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43316. This study involved multiple reactions and reactants, such as 1,1,1,3,3,3-Hexafluoroisopropylmethacrylate (cas: 3063-94-3Quality Control of 1,1,1,3,3,3-Hexafluoroisopropylmethacrylate).

1,1,1,3,3,3-Hexafluoroisopropylmethacrylate (cas: 3063-94-3) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Quality Control of 1,1,1,3,3,3-Hexafluoroisopropylmethacrylate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Ring opening copolymerization of e-caprolactone and diselenic macrolide carbonate for well-defined poly(ester-co-carbonate): kinetic evaluation and ROS/GSH responsiveness was written by Wang, Jiahao;Sun, Chuanhao;Hu, Jieni;Huang, Yanling;Lu, Yunxiang;Zhang, Yan. And the article was included in Polymer Chemistry in 2020.Application In Synthesis of Diphenyl carbonate The following contents are mentioned in the article:

A resurgence of interest has recently propelled poly(e-caprolactone) (PCL) back into the biomaterials arena. Herein, we reported a new poly(ester-co-carbonate) via the copolymerization of e-CL and a diselenic macrolide carbonate monomer (M_SeSe). The structure of the copolymer was confirmed by NMR, FTIR and GPC. The kinetic exptl. studies showed that the monomer reactivity ratios of e-CL (r₁) and M_SeSe (r₂) were different and the final sequence distribution of the copolymer was random, which agreed well with the theor. results based on d. functional theory (DFT) calculations The results of DSC and XRD consistently indicated that the copolymers were inclined to be amorphous with the increase in the M_SeSe fraction. UV, DLS and TEM techniques were employed to demonstrate the variation of transmittance, size and the morphol. of copolymer micelles subjected to the GSH and ROS environments, and the mechanism was clarified by FTIR and GPC, which demonstrated that the copolymers had rich environment responsiveness. Therefore, poly(ester-co-carbonate) with higher ROS and GSH sensitivity has great potential in the biomaterials field. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Application In Synthesis of Diphenyl carbonate).

Diphenyl carbonate (cas: 102-09-0) belongs to esters. Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids. Esters are responsible for the aroma of many fruits. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Application In Synthesis of Diphenyl carbonate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Germanium Hydride Catalyzed Selective Hydroboration and Cyanosilylation of Ketones was written by Khuntia, Anwesh Prasad;Sarkar, Nabin;Patro, A. Ganesh;Sahoo, Rajata Kumar;Nembenna, Sharanappa. And the article was included in European Journal of Inorganic Chemistry in 2022.Category: esters-buliding-blocks The following contents are mentioned in the article:

Two new examples of β-diketiminate or NacNac analogs, i. e., conjugated bis-guanidinate (CBG) stabilized low valent germanium chloride (1) and germanium hydride (2) complexes, are reported. Deprotonation of LH upon treatment with n-BuLi and an in situ generated LLi further treated with GeCl₂·dioxane afforded LGeCl in 79% yield. Compound 1 reacted with hydride source NaHBEt₃ in toluene, afforded Ge (II) hydride (2) in 76% yield. Both compounds 1 and 2 were characterized by NMR and mass spectroscopic methods. Further, germanium hydride catalyzed hydroboration and cyanosilylation of a wide range of ketones have been investigated. Control reactions suggest hydroboration reactions occurred via insertion and Ge-O/B-H bond metathesis pathways. It is worthy of mentioning that, in the case of hydroboration of ketones, reducible groups such as alkene, alkyne, halide, ester, nitro, and heterocycles were untouched. Furthermore, compound 2 was employed for the reduction of carbonate, formate, and anhydride substrates via the hydroboration technique. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0Category: esters-buliding-blocks).

Diphenyl carbonate (cas: 102-09-0) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Esterification is the general name for a chemical reaction in which two reactants (typically an alcohol and an acid) form an ester as the reaction product. Esters are common in organic chemistry and biological materials.Category: esters-buliding-blocks

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Continuous Wave and Time-Resolved Electron Paramagnetic Resonance Study of Photoinduced Radicals in Fluoroacrylic Porous Polymer Films was written by Sheveleva, A. M.;Ivanov, M. Yu.;Shundrina, I. K.;Bukhtoyarova, A. D.;Bagryanskaya, E. G.;Fedin, M. V.. And the article was included in Journal of Physical Chemistry C in 2016.Recommanded Product: 3063-94-3 The following contents are mentioned in the article:

The authors have combined continuous wave (CW) and time-resolved (TR) ESR to study UV photodegradation of thin porous films of a few representative fluoroacrylic polymers. Different types of spectra were detected using CW and TR EPR and assigned to the species formed on the inner surface of the pores and in the bulk of the polymer, resp. The radical pairs formed in the bulk are short-lived, as is evidenced by TR EPR, and most likely recombine back to the initial polymer. On the contrary, the radicals formed on the surface of the pores are metastable in the absence of oxygen; they can be studied by CW EPR and clearly assigned to the radicals of type ·C(CH₃)CH₂– (so-called propagating radicals) formed via the cleavage of the C-C bond of the ester side chains and consecutive β-scission. Remarkably, their CW EPR spectra closely resemble solution-state spectra, indicating that these radicals are localized in the pores where the mobility of Me and methylene protons is not suppressed. UV photodegradation of porous fluoroacrylic polymer films mainly occurs on the inner surface of the pores, which needs to be considered in future development of this type PSPs. This study involved multiple reactions and reactants, such as 1,1,1,3,3,3-Hexafluoroisopropylmethacrylate (cas: 3063-94-3Recommanded Product: 3063-94-3).

1,1,1,3,3,3-Hexafluoroisopropylmethacrylate (cas: 3063-94-3) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Recommanded Product: 3063-94-3

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Evaluation of volatile compounds released during ceramic material sintering produced from industrial waste by TGA/DTG and PY-GC/MS was written by Souza de Caux, Leonardo;Guimaraes, Cleide Castro Justino;Dalvi, Leandro Coelho. And the article was included in Papel in 2013.Formula: C15H22O2 The following contents are mentioned in the article:

The generation of waste occurs due to the growth of industrial activities, causing in a long-term the depletion of natural sources. The kraft pulp industry has a water demand associated to its process, which involves the generation of a residue derived from water treatment plants. The feasibility of using these wastes in red ceramic production has been demonstrated in the literature and in previous works. However, the sintering process of these materials leads to heating the material at a min. temperature of 800°C and also to atm. emissions from gases release. In order to verify if the reuse of this waste could compromise the environment due to the gases released during its processing in the ceramic industry, the volatile compounds from its heat were evaluated. The compounds were analyzed by pyrolysis gas chromatog.-mass spectrometry. The results from a sample of the residue were compared with results obtained by the same technique from a sample of com. clay. The results showed the same classes of compounds released during heating in both samples, leading to the conclusion that the use of this residue does not compromise the pottery operation concerning the atm. emissions. This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7Formula: C15H22O2).

2-Ethylhexyl benzoate (cas: 5444-75-7) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Formula: C15H22O2

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Nanocomposite thin films for surface protection in electrical contact applications was written by Noel, Sophie;Alamarguy, David;Houze, Frederic;Benedetto, Alessandro;Viel, Pascal;Palacin, Serge;Izard, Nicolas;Chenevier, Pascale. And the article was included in IEEE Transactions on Components and Packaging Technologies in 2009.Category: esters-buliding-blocks The following contents are mentioned in the article:

Increased demands on reliability, operations in harsh environments, and miniaturization of elec. contacts justify research on totally innovating coatings. Such films require many specific properties such as proper conduction and mech. behavior. The approach reported here is based on the idea of associating a polymer matrix and a conducting charge. The polymer matrix was chosen to resist mech. degradation while the charge allows good conductivity The first results obtained by associating a carbon nanotube (CNT) network to a fluorinated polymer thin layer are presented here. Several characterization techniques such as XPS, Fourier transform infra red (FT-IR) and Raman spectroscopy have allowed the control of the various steps of the elaboration process. Films were deposited on cuprous coupons with a nickel underlayer and an electrodeposited gold final layer. Several matrixes were studied. The properties of these thin films were investigated in a ball plane contact configuration: first elec. and mech. characterizations show low values of contact resistance and friction coefficient The CNT network influence is investigated both at a macroscopic scale and at a microscopic one. This study involved multiple reactions and reactants, such as 1,1,1,3,3,3-Hexafluoroisopropylmethacrylate (cas: 3063-94-3Category: esters-buliding-blocks).

1,1,1,3,3,3-Hexafluoroisopropylmethacrylate (cas: 3063-94-3) belongs to esters. Carboxylic acid esters of low molecular weight are colourless, volatile liquids with pleasant odours, slightly soluble in water. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Category: esters-buliding-blocks

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Dynamics of polymers in concentrated solutions: A weaker self-concentration effect was written by Yan, Zhi-Chao;Wang, Wei. And the article was included in Polymer in 2018.Recommanded Product: 5444-75-7 The following contents are mentioned in the article:

We examine the validity of the Lodge-McLeish (LM) self-concentration model on polymer dynamics in concentrated polymer/small mol. solutions Three solutions, 1,2-polybutadiene/2-ethylhexyl benzoate, 1,4-polyisoprene/phenyloctane, and polystyrene/2-ethylhexyl benzoate, are investigated by rheol. technique. The temperature dependence of their normalized terminal relaxation times is fitted by the WLF equation to extract the effective glass transition temperature The calculated self-concentration is found lower than the LM prediction, in contrast with the significant values in miscible polymer blends. According to the mol. dynamic simulation, this weak self-concentration effect is explained by the overestimation of the polymer’s interchain concentration, which is postulated as the global average concentration in the original LM model. The lower interchain concentration in solutions is attributed to the higher probabilities for small mols. to fill the cooperative volume Both exptl. and simulation results may motivate the further theor. modification on the interchain concentration in order to establish a self-consistent model predicting both miscible blends and polymer solutions This study involved multiple reactions and reactants, such as 2-Ethylhexyl benzoate (cas: 5444-75-7Recommanded Product: 5444-75-7).

2-Ethylhexyl benzoate (cas: 5444-75-7) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.Recommanded Product: 5444-75-7

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Chemical transformation of terpenoids. X. Ionophoretic activities of macrocyclic lactone epoxides synthesized from geraniol was written by Shibuya, Hirotaka;Ohashi, Kazuyoshi;Narita, Norihiko;Ishida, Toshimasa;Kitagawa, Isao. And the article was included in Chemical & Pharmaceutical Bulletin in 1994.Quality Control of (2E,6E)-3,7-Dimethyl-8-oxoocta-2,6-dien-1-yl acetate The following contents are mentioned in the article:

Two coronand-type 18-membered lactone epoxides, i.e., geranyl dimeric lactone diepoxide (GL₂E₂, I) and tetraepoxide (GL₂E₄, II), were synthesized from geraniol as diastereomeric mixtures Among them, II was shown to exhibit ion-transport activity for Ca²⁺ ion in the test using a W-07 (liquid-membrane type) apparatus and ion-permeation activities for Ca²⁺ and K⁺ ions across the human erythrocyte membrane. Isolation of six component diastereomers of II was effected by HPLC separation of two diastereomeric tetraepoxides, III and IV which were prepared from two diepoxides I. The relative stereostructures of these diastereomers were determined by a combination of X-ray diffraction and ¹H-NMR analyses. Among the six diastereomers, S₂-sym. V exhibited the strongest ion-transport activity for Ca²⁺ ion while C₂-sym. GL₂E₄-6 VI exhibited the strongest ion-permeation activity for Ca²⁺ ion across the human erythrocyte membrane. This study involved multiple reactions and reactants, such as (2E,6E)-3,7-Dimethyl-8-oxoocta-2,6-dien-1-yl acetate (cas: 37905-02-5Quality Control of (2E,6E)-3,7-Dimethyl-8-oxoocta-2,6-dien-1-yl acetate).

(2E,6E)-3,7-Dimethyl-8-oxoocta-2,6-dien-1-yl acetate (cas: 37905-02-5) belongs to esters. Esters typically have a pleasant smell; those of low molecular weight are commonly used as fragrances and are found in essential oils and pheromones. Many esters have the potential for conformational isomerism, but they tend to adopt an s-cis (or Z) conformation rather than the s-trans (or E) alternative, due to a combination of hyperconjugation and dipole minimization effects. The preference for the Z conformation is influenced by the nature of the substituents and solvent, if present. Lactones with small rings are restricted to the s-trans (i.e. E) conformation due to their cyclic structure.Quality Control of (2E,6E)-3,7-Dimethyl-8-oxoocta-2,6-dien-1-yl acetate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Synthesis, Herbicidal Activity, Crop Safety and Soil Degradation of Pyrimidine- and Triazine-Substituted Chlorsulfuron Derivatives was written by Wu, Lei;Gu, Yu-Cheng;Li, Yong-Hong;Zhou, Sha;Wang, Zhong-Wen;Li, Zheng-Ming. And the article was included in Molecules in 2022.HPLC of Formula: 102-09-0 The following contents are mentioned in the article:

In order to obtain sulfonylurea herbicides with good crop safety for both wheat and corn, while maintaining high herbicidal activities, a series of pyrimidine- and triazine-based diethylamino-substituted chlorsulfuron derivatives I [R¹ = Me, MeO, p-tolyl, etc.; R² = CH,N; R³ = H, Me, MeO, Cl] were systematically evaluated. The structures of the synthesized compounds I were confirmed with ¹H NMR, ¹³C NMR and HRMS. The preliminary biol. assay results indicate that the 4,6-disubstituted pyrimidine and triazine derivatives could maintain high herbicidal activity. It was found that the synthesized compounds I could accelerate degradation rates, both in acidic and alk. soil. Especially, in alk. soil, the degradation rate of the target compounds I accelerated more than 22-fold compared to chlorsulfuron. Moreover, most chlorsulfuron analogs I exhibited good crop safety for both wheat and corn at high dosages. This study provided a reference for the further design of new sulfonylurea herbicides I with high herbicidal activity, fast degradation rates and high crop safety. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0HPLC of Formula: 102-09-0).

Diphenyl carbonate (cas: 102-09-0) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Because of their lack of hydrogen-bond-donating ability, esters do not self-associate. Consequently, esters are more volatile than carboxylic acids of similar molecular weight.HPLC of Formula: 102-09-0

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Tyrosine-Reactive Cross-Linker for Probing Protein Three-Dimensional Structures was written by Cui, Lili;Ma, Yongge;Li, Ming;Wei, Zhonglin;Huan, Yanfu;Li, Hongmei;Fei, Qiang;Zheng, Lianyou. And the article was included in Analytical Chemistry (Washington, DC, United States) in 2021.SDS of cas: 102-09-0 The following contents are mentioned in the article:

Crosslinking mass spectrometry (XL-MS) has made significant progress in understanding the structure of protein and elucidating architectures of larger protein complexes. Current XL-MS applications are limited to targeting lysine, glutamic acid, aspartic acid, and cysteine residues. There remains a need for the development of novel cross-linkers enabling selective targeting of other amino acid residues in proteins. Here, a novel simple cross-linker, namely, [4,4′-(disulfanediylbis(ethane-2,1-diyl)) bis(1,2,4-triazolidine-3,5-dione)] (DBB) (I), has been designed, synthesized, and characterized. This cross-linker can react selectively with tyrosine residues in protein through the electrochem. click reaction. The DBB cross-links produced the characteristic peptides before and after electrochem. reduction, thus permitting the simplified data anal. and accurate identification for the cross-linked products. This is the first time a cross-linker is developed for targeting tyrosine residues on protein without using photoirradiation or a metal catalyst. This strategy might potentially be used as a complementary tool for XL-MS to probe protein 3D structures, protein complexes, and protein-protein interaction. This study involved multiple reactions and reactants, such as Diphenyl carbonate (cas: 102-09-0SDS of cas: 102-09-0).

Diphenyl carbonate (cas: 102-09-0) belongs to esters. Esters perform as high-grade solvents for a broad array of plastics, plasticizers, resins, and lacquers, and are one of the largest classes of synthetic lubricants on the commercial market. Polyesters are important plastics, with monomers linked by ester moieties. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. SDS of cas: 102-09-0

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics