Month: December 2022

Yang, Jingshu published the artcileCp*Co^III-catalyzed formal [4+2] cycloaddition of benzamides to afford quinazolinone derivatives, Related Products of esters-buliding-blocks, the publication is Chemical Communications (Cambridge, United Kingdom) (2019), 55(92), 13840-13843, database is CAplus and MEDLINE.

A Cp*CoIII-catalyzed arene C-H bond amidation/annulation of benzamides was developed to afford quinazolinone derivatives in one-pot with high yields and broad substrate scope. This method could be applied to the synthesis of quinazolinone drugs and late-stage modification of natural products.

Chemical Communications (Cambridge, United Kingdom) published new progress about 1877-71-0. 1877-71-0 belongs to esters-buliding-blocks, auxiliary class Carboxylic acid,Benzene,Ester, name is 3-(Methoxycarbonyl)benzoic acid, and the molecular formula is C9H8O4, Related Products of esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

He, Meinan published the artcileFluorinated Electrolytes for 5-V Li-Ion Chemistry: Probing Voltage Stability of Electrolytes with Electrochemical Floating Test, SDS of cas: 156783-96-9, the publication is Journal of the Electrochemical Society (2015), 162(9), A1725-A1729, database is CAplus.

Electrolyte formulations containing fluorinated cyclic carbonates and fluorinated linear carbonates with LiPF₆ were evaluated as electrolyte solvents for high-voltage Li-ion batteries. The anodic stability of the new electrolytes on fully charged spinel LiNi_0.5Mn_1.5O₄ (LNMO) cathode was examined by electrochem. floating tests. The effects of F substitution on the cyclic and linear carbonate, ratio of cyclic vs. linear carbonate, and LiPF₆ concentration on the electrolyte oxidation stability were studied. Based on this study, the floating test proved to be an effective tool for identification of stable electrolyte materials.

Journal of the Electrochemical Society published new progress about 156783-96-9. 156783-96-9 belongs to esters-buliding-blocks, auxiliary class Trifluoromethylated Building Blocks, name is Ethyl (2,2,2-trifluoroethyl) carbonate, and the molecular formula is C5H7F3O3, SDS of cas: 156783-96-9.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Zhang, Rong published the artcileImproved Sensitivity of Flexible Conductive Composites Throughout the Working Strain Range Based on Bioinspired Strain Redistribution, Related Products of esters-buliding-blocks, the publication is ACS Applied Polymer Materials (2022), 4(3), 1608-1616, database is CAplus.

Elastomer conductive composites (ECC) are wonderful candidates for stretchable strain sensors. However, the sensitivity of ECC-based flexible strain sensors is limited in low strain range, the main working range for human movements, due to the insignificant geometric change of the sample shape and weak tunneling effect of the conductive network. Herein, bioinspired heterogeneous thermoplastic polyurethane (TPU) /carbon black (CB) composites (TCs) are assembled by hot-pressing two TCs with different Young’s moduli in series. The modulus of the TCs is controlled by CB content, Young’s modulus of TPU, and plasticizer content. Exptl. results and finite element anal. (FEA) confirm the low Young’s modulus component undergoes higher strain compared with the high Young’s modulus component, resulting in a more serious change of conductive network and higher gauge factor (GF) values. Compared with homogeneous TCs, the GF of heterogeneous TCs was improved by a factor of 20.7 and 9.6 in the low strain (0-6%) and high range, resp. The relation between modulus variety and GF is quant. described and the GF values depend on the Young’s modulus of individual components. Constructing a heterogeneous structure with difference Young’s moduli is a valuable and facile way to increase the sensitivity of ECC-based flexible strain sensors.

ACS Applied Polymer Materials published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C8H5F3O3, Related Products of esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Wang, Jinyuan published the artcileImproving the thermal stability of poly(cyclohexylene carbonate) by in situ end-capping, Synthetic Route of 31570-04-4, the publication is Polymer Bulletin (Heidelberg, Germany) (2022), 79(8), 6073-6086, database is CAplus.

Aliphatic polycarbonates derived from carbon dioxide and epoxides are drawing increasing attention from both academic and industrial researchers due to their biodegradability and partially renewable raw material resource. Of all the aliphatic polycarbonates investigated, poly(cyclohexene carbonate) (PCHC) is recognized as highly potential candidates thanks to its high glass transition temperature (T_g) which can bridge the shortcomings of commercialized biodegradable materials. Meanwhile, polymers with high T_g require higher processing temperature during compounding and subsequent casting in mold. It is therefore necessary to investigate the property changes of PCHC during its multiple thermal processing. In this work, the effect of several thermal stabilizers on the thermal stability and mech. properties of PCHC was studied. The results showed that end-capping by maleic anhydride is the best approach to improve the thermal stability and to maintain the mech. properties of PCHC. The possible mechanism for improving the thermal stability of PCHC was further analyzed by Py-GC/MS and ¹H NMR. Partial in situ end-capping of PCHC could mitigate the back-biting reaction at elevated temperature and consequently improved the thermal stability.

Polymer Bulletin (Heidelberg, Germany) published new progress about 31570-04-4. 31570-04-4 belongs to esters-buliding-blocks, auxiliary class Mono-phosphine Ligands, name is Tris(2,4-di-tert-butylphenyl) phosphite, and the molecular formula is C12H15ClO3, Synthetic Route of 31570-04-4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Ma, Jing-Yao published the artcileSolvency and salt addition influence the photoresponsivity and fluorescence in an azobenzene-containing block copolymer, Computed Properties of 135529-02-1, the publication is Polymer (2021), 123941, database is CAplus.

We investigated the effects of solvency and salt addition on the morphol., photoresponsivity, and fluorescence of the block copolymer poly(ethylene glycol)methyl ether-block-poly(6-[4-(4′-methoxyphenylazo)phenoxy]hexyl methacrylate) (PEG-b-PAzo). The morphol. of PEG-b-PAzo was manipulated through dissolution in mixed solvents of DMF (DMF) and H₂O. DMF served as a good solvent for both blocks, whereas H₂O was a PEG-selective solvent. Increasing the concentration of H₂O in the mixed solvent increased the repulsive interaction between H₂O and PAzo chains, resulting in the assembly of PEG-b-PAzo into micelles composed of PEG in the corona and PAzo in the core. The confined geometry forced the mesogens to assemble into H-type aggregates. Adding KCl to the PEG-b-PAzo solution increased PEG segment hydrophobicity, causing an increase in the core radius and a reduction in the corona thickness. The opposite effect was observed when KSCN was added to the PEG-b-PAzo solution The addition of salts led to slight reductions in H-type aggregate percentage and increases in nonassocd. mesogen percentage. The fluorescence behavior of PEG-b-PAzo was closely correlated with a mesogen dispersion state. In the saltless PEG-b-PAzo solution, the increase in the percentage of the H-type aggregates, which was due to the addition of H₂O, caused fluorescence loss. The small changes in mesogen aggregation upon the addition of salts led to only a small change in fluorescence emission.

Polymer published new progress about 135529-02-1. 135529-02-1 belongs to esters-buliding-blocks, auxiliary class azo,Alkenyl,Benzene,Ester,Ether, name is 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, and the molecular formula is C23H28N2O4, Computed Properties of 135529-02-1.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Liu, Jui-Hsiang published the artcilePreparation and characterization of chiral polyacrylates end-capped with bornyl groups in the side chains, Category: esters-buliding-blocks, the publication is Journal of Polymer Science, Part A: Polymer Chemistry (2004), 42(5), 1075-1092, database is CAplus.

Chiral polyacrylates with bornyl end-capped side chains with four kinds of mesogenic moieties (azobenzene, biphenyl, benzoyloxy biphenyl, and Ph benzoate) were prepared The phase properties of the polymers were investigated with X-ray diffraction, differential scanning calorimetry, and polarizing optical microscopy. The thermogravimetric characteristics, the glass-transition temperatures and weight-average mol. weights, of the homopolymers were evaluated. The optical properties of the synthesized polymers in diluted solutions and in the thin-film state were also evaluated. The optical behavior of the composite films upon photoirradiation was investigated through the change in the transmittance of the probe light triggered by UV (365-nm) irradiation UV irradiation and heat treatment caused a reversible intensity change of the probe light at λ = 400 nm. The shrinkage of the photoisomerization of the composite films was also investigated with at. force microscopy. A spot contraction appeared on the surface when it was irradiated with a laser light spot. The contraction was recovered by heat treatment at 80° for 10 min.

Journal of Polymer Science, Part A: Polymer Chemistry published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, Category: esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Zhu, Guangda published the artcileDigital Light Processing 3D Printing of Enhanced Polymers via Interlayer Welding, COA of Formula: C11H15NO2, the publication is Macromolecular Rapid Communications (2022), 43(9), 2200053, database is CAplus and MEDLINE.

Digital light processing (DLP) 3D printing is advantageous in high printing efficiency and printing resolution for fabricating complex structures across various applications. However, the layer-by-layer curing manner of DLP leads to weak interlayer adhesion and the anisotropic mech. properties of printed objects. Here, linear polymers are introduced into com. resins to weld the interlayer by the diffusion and entanglement of linear polymers after DLP printing via heat treatment. This introduction of linear polymers not only shows a strengthening and toughening effect on the printed objects, but also has no neg. impact on the DLP printability. The tensile strengths of objects containing 4.7 wt% polycaprolactone can reach up to ≈500% of that of neat samples in any printing direction. This simple strategy by adding linear polymers into printing resins provides an effective access to prepare DLP printed objects with improved mech. properties as well as ensure printing resolution and printing efficiency.

Macromolecular Rapid Communications published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C3H5BN2O2, COA of Formula: C11H15NO2.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Zhu, Guangda published the artcileDigital Light Processing 3D Printing of Healable and Recyclable Polymers with Tailorable Mechanical Properties, Safety of Ethyl 4-dimethylaminobenzoate, the publication is ACS Applied Materials & Interfaces (2021), 13(29), 34954-34961, database is CAplus and MEDLINE.

Three-dimensional (3D) printing is becoming a revolutionary technique across various fields. Especially, digital light processing (DLP) 3D printing shows advantages of high resolution and high efficiency. However, multifunctional monomers are commonly used to meet the rapid liquid-to-solid transformation during DLP printing, and the extensive production of unreprocessable thermosets will lead to resource waste and environmental problems. Here, we report a family of dynamic polymers with highly tailorable mech. properties for DLP printing. The dynamic polymers crosslinked by ionic bonding and hydrogen bonding endow printed objects with excellent self-healing and recycling ability. The mech. properties of printed objects can be easily tailored from soft elastomers to rigid plastics to satisfy practical applications. Taking advantage of the dynamic crosslinking, various assembling categories, including 2D to 3D, small to large 3D structures, and same to different materials assembly, and functional devices with a self-healing capacity can be realized. This study not only helps to address environmental issues caused by traditional DLP-printed thermosets but also realizes the on-demand fabrication of complex structures.

ACS Applied Materials & Interfaces published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C3H5BN2O2, Safety of Ethyl 4-dimethylaminobenzoate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Wang, Yao published the artcileMacrophage-targeting gene silencing orchestrates myocardial microenvironment remodeling toward the anti-inflammatory treatment of ischemia-reperfusion (IR) injury, Safety of Trimethylolpropane triacrylate, the publication is Bioactive Materials (2022), 320-333, database is CAplus and MEDLINE.

Ischemia-reperfusion (IR) injury represents a major cause of myocardial dysfunction after infarction and thrombolytic therapy, and it is closely related to the free radical explosion and overwhelming inflammatory responses. Herein, macrophage-targeting nanocomplexes (NCs) are developed to mediate efficient co-delivery of siRNA against MOF (siMOF) and microRNA-21 (miR21) into myocardial macrophages, cooperatively orchestrating the myocardial microenvironment against IR injury. Bioreducible, branched poly(β-amino ester) (BPAE-SS) is designed to co-condense siMOF and miR21 into NCs in a multivalency-reinforced approach, and they are surface-decorated with carboxylated mannan (Man-COOH) to shield the pos. surface charges and enhance the serum stability. The final MBSsm NCs are efficiently internalized by myocardial macrophages after systemic administration, wherein BPAE-SS is degraded into small segments by intracellular glutathione to promote the siMOF/miR21 release, finally provoking efficient gene silencing. Thus, cardiomyocyte protection and macrophage modulation are realized via the combined effects of ROS scavenging, inflammation inhibition, and autophagy attenuation, which ameliorates the myocardial microenvironment and restores the cardiac function via pos. cellular crosstalk. This study renders promising solutions to address the multiple systemic barriers against in vivo nucleic acid delivery, and it also offers new options for IR injury by manipulating multiple reciprocal bio-reactions.

Bioactive Materials published new progress about 15625-89-5. 15625-89-5 belongs to esters-buliding-blocks, auxiliary class Polymerization Reagents,Crosslinkers, name is Trimethylolpropane triacrylate, and the molecular formula is C13H13N, Safety of Trimethylolpropane triacrylate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Kutsumizu, Shoichi published the artcileSmectic C to Cubic Phase Transition of 4′-n-Docosyloxy-3′-nitrobiphenyl-4-carboxylic Acid (ANBC-22) and Alternating-Current Electric Field Effect, COA of Formula: C15H14O3, the publication is Journal of Physical Chemistry B (2009), 113(3), 640-646, database is CAplus and MEDLINE.

Smectic C (SmC) to cubic (Cub) phase transition behavior of 4′-n-docosyloxy-3′-nitrobiphenyl-4-carboxylic acid (ANBC-22) and alternating-current (AC) elec. field effect on the SmC phase were examined The most important and unexpected finding is that even at a temperature 8 K below the zero-field SmC to Cub phase transition temperature (T_SmC-Cub ≈ 408 K) determined previously for the compound and without field, the Cub phase growth occurs, after a very long induction period of several hours. The X-ray diffraction measurements revealed the formation of an Im3m-type Cub phase at the temperature It is suggested that the “true” transition temperature, which is difficult to determine precisely, exists around 396 K. The time-dependence of the Cub phase growth both without field and under field was analyzed using the well-known Avrami equation, implying the nucleation and growth mechanism mainly operating in the SmC to Cub phase transformation. The fact uncovered is that between 408 and 396 K, the SmC to Cub transformation is virtually prohibited by the strongly limited nucleation. It is concluded that the effect of the elec. field on the transition is to promote the nucleation of the Cub phase in the temperature region where the Cub phase is potentially more stable than the precursory SmC phase.

Journal of Physical Chemistry B published new progress about 50670-76-3. 50670-76-3 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester, name is Ethyl 4′-hydroxy-[1,1′-biphenyl]-4-carboxylate, and the molecular formula is C15H14O3, COA of Formula: C15H14O3.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics