Tag: 200-300

Okada, Satoshi; Takayasu, Satoko; Tomita, Shunsuke; Suzuki, Yoshio; Yamamoto, Shinya published an article in 2020, the title of the article was Development of neutral pH-responsive microgels by tuning cross-linking conditions.Safety of Oxybis(ethane-2,1-diyl) bis(2-methylacrylate) And the article contains the following content:

Polymer microgels that respond in a range of neutral pH can be useful for the development of mol. imaging tools and drug-delivery carriers. Here, we describe a simple approach in developing microgels that undergo volume phase transitions and substantial NMR (NMR) relaxometric changes within a narrow pH range of 6.4 to 7.4. The pH-responsive microgels were synthesized using methacrylic acid and a series of ethylene glycol dimethacrylate cross-linkers with repeating units of ethylene glycol that range from one to four. NMR relaxometry demonstrated that the transverse relaxation time (T2) of a suspension containing microgels that were cross-linked with diethylene glycol dimethacrylate sharply decreases at the pH where volume phase transition occurs. The polymer microgels cross-linked with 40 and 45 mol% of diethylene glycol dimethacrylate caused about 50% T2 reduction with decreasing pH from 6.8 to 6.4. These results demonstrated that responses of microgels to a range of neutral pH can be easily tuned by using appropriate cross-linkers with certain crosslinking degree. This approach can be useful in developing highly sensitive mol. sensors for magnetic resonance imaging (MRI) of tissue pH values. The experimental process involved the reaction of Oxybis(ethane-2,1-diyl) bis(2-methylacrylate)(cas: 2358-84-1).Safety of Oxybis(ethane-2,1-diyl) bis(2-methylacrylate)

The Article related to development neutral ph responsive microgel tuning crosslinking condition, mri, nmr relaxation time, ph-responsive microgels, volume phase transition, Pharmaceuticals: Formulation and Compounding and other aspects.Safety of Oxybis(ethane-2,1-diyl) bis(2-methylacrylate)

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

On July 6, 2020, Tsui, Elaine; Metrano, Anthony J.; Tsuchiya, Yuto; Knowles, Robert R. published an article.Synthetic Route of 2873-29-2 The title of the article was Catalytic Hydroetherification of Unactivated Alkenes Enabled by Proton-Coupled Electron Transfer. And the article contained the following:

The authors report a catalytic, light-driven method for the intramol. hydroetherification of unactivated alkenols to furnish cyclic ether products. These reactions occur under visible-light irradiation in the presence of an IrIII-based photoredox catalyst, a Bronsted base catalyst, and a hydrogen-atom transfer (HAT) co-catalyst. Reactive alkoxy radicals are proposed as key intermediates, generated by direct homolytic activation of alc. O-H bonds through a proton-coupled electron-transfer mechanism. This method exhibits a broad substrate scope and high functional-group tolerance, and it accommodates a diverse range of alkene substitution patterns. Results demonstrating the extension of this catalytic system to carboetherification reactions are also presented. The experimental process involved the reaction of (2R,3S,4R)-2-(Acetoxymethyl)-3,4-dihydro-2H-pyran-3,4-diyl diacetate(cas: 2873-29-2).Synthetic Route of 2873-29-2

The Article related to alkene hydroetherification iridium catalyst proton coupled electron transfer, alcohols, ethers, hydroetherification, photocatalysis, radicals, General Organic Chemistry: Synthetic Methods and other aspects.Synthetic Route of 2873-29-2

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

Ojovan, Michael I. published an article in 2020, the title of the article was On viscous flow in glass-forming organic liquids.Synthetic Route of 118-55-8 And the article contains the following content:

The two-exponential Sheffield equation of viscosity η (T) = A1·T·[1 + A2·exp(Hm/RT)]·[1 + C·exp(Hd/RT)], where A1, A2, Hm, C, and Hm are material-specific constants, is used to analyze the viscous flows of two glass-forming organic materials-salol and α-phenyl-o-cresol. It is demonstrated that the viscosity equation can be simplified to a four-parameter version: η(T) = [A·T·exp(Hm/RT)]·[1 + C·exp(Hd/RT)]. The Sheffield model gives a correct description of viscosity, with two exact Arrhenius-type asymptotes below and above the glass transition temperature, whereas near the Tg it gives practically the same results as well-known and widely used viscosity equations. It is revealed that the constants of the Sheffield equation are not universal for all temperature ranges and may need to be updated for very high temperatures, where changes occur in melt properties leading to modifications of A and Hm for both salol and α-phenyl-o-cresol. The experimental process involved the reaction of Phenyl Salicylate(cas: 118-55-8).Synthetic Route of 118-55-8

The Article related to glass forming organic liquid viscous flow, activation energy, glass transition temperature, glass-forming liquids, viscosity, viscous flow, General Physical Chemistry: General Theories and other aspects.Synthetic Route of 118-55-8

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

Matsumae, Izumi; Wakasa, Kunio; Takahashi, Hitoshi; Senoo, Hirofumi; Morikawa, Akihiro; Urabe, Hidenori; Fujitani, Morioki; Satou, Naoki; Shintani, Hideaki; Yamaki, Masao published an article in 1996, the title of the article was Effect of diluent monomers on color change vector in visible light-cured resin.COA of Formula: C13H20O4 And the article contains the following content:

Studies on the effect of diluent monomers (TEGDMA, GDMA, NPGDMA ; using Bis-GMA as base monomer) on color change vector in visible light-cured resin indicated that there is a high correlation between color changes and the ζ-potential measured. These results suggested that the surface potential played an important role in dental resin coloring. The experimental process involved the reaction of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)(cas: 1985-51-9).COA of Formula: C13H20O4

The Article related to diluent monomer photocurable dental resin color, Pharmaceuticals: Prosthetics and Medical Goods and other aspects.COA of Formula: C13H20O4

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

Yamada, A.; Sakurai, Y.; Nakamura, K.; Hanyu, F.; Yoshida, M.; Kaetsu, I. published an article in 1980, the title of the article was The anticancer drug capsule with controlled-release for a long time and change of release rate.Safety of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate) And the article contains the following content:

The capsule was prepared containing mitomycin-C (I) [50-07-7], poly(Me methacrylate) [9011-14-7], together with glass-forming monomers. The capsule was irradiated with 1 × 106 rad γ-ray. The capsule when located around or in inoperable malignant tumor, caused no severe secondary effects like leukopenia. Changing the volume of anticancer drug, amount of γ-irradiation, and kind of monomer, the release period could be extended from 2-4 wk to 140 days. The experimental process involved the reaction of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)(cas: 1985-51-9).Safety of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)

The Article related to neoplasm inhibitor capsule controlled release, Pharmaceuticals: Prosthetics and Medical Goods and other aspects.Safety of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)

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

On October 31, 1978, Satoh, Hiroshi; Nakabayashi, Nobuo; Masuhara, Eiichi published an article.Safety of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate) The title of the article was Effect of cross-linking agents on mechanical properties of a fluid resin. And the article contained the following:

The effect of crosslinking agents [2,2-bis(4-methacryloxyethoxyphenyl)propane [24448-20-2], trimethylolpropane trimethacrylate [3290-92-4], neopentylglycol dimethacrylate [1985-51-9], hexamethylene glycol dimethacrylate [6606-59-3] and poly(1,2-butadiene) [9003-17-2]] on phys. properties of the liquid resin poly(Me methacrylate) [9011-14-7] was investigated. The phys. properties tested included Brinell hardness, tensile strength, impact strength and transverse strength. Neopentyl glycol dimethacrylate was the best crosslinking agent among the 5 compounds tested, as reflected by their phys. properties. The optimum concentration of added neopentyl glycol dimethacrylate was 5%. Microscopic examinations revealed that the diffusibility of crosslinking agents into the liquid resin powder profoundly affected the phys. properties. The experimental process involved the reaction of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)(cas: 1985-51-9).Safety of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)

The Article related to dental polymethacrylate property crosslinker, Pharmaceuticals: Prosthetics and Medical Goods and other aspects.Safety of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)

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

On July 31, 1979, Horiuchi, Akira published an article.Quality Control of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate) The title of the article was Aging effect on mechanical properties in fluid resin. Part 2. Affect of the crosslinking agent, neopentyl glycol dimethacrylate. And the article contained the following:

Brinell hardness and tensile strength were measured, weight decrease of specimens due to evaporation of residual monomer were also determined, and the relationship between amount of residual monomer and the mech. properties was studied. The addition of neopentyl glycol dimethacrylate [MeC(:CH2)CO2CH2]2CMe2] (I) [1985-51-9] in Me methacrylate [80-62-6] improved the mech. properties nearly the same as the heat processed resins and was effective in decreasing residual monomers. The rate of polymerization increased and the heat of polymerization decreased the temperature of the curing mass. Properties of the new I liquid resin must be improved by loss of residual monomer and crosslinking structure. The experimental process involved the reaction of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)(cas: 1985-51-9).Quality Control of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)

The Article related to dental resin neopentyl glycol methacrylate, Pharmaceuticals: Prosthetics and Medical Goods and other aspects.Quality Control of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)

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

On December 15, 2001, Yourtee, D. M.; Smith, R. E.; Russo, K. A.; Burmaster, S.; Cannon, J. M.; Eick, J. D.; Kostoryz, E. L. published an article.Category: esters-buliding-blocks The title of the article was The stability of methacrylate biomaterials when enzyme challenged: kinetic and systematic evaluations. And the article contained the following:

This study addressed whether methacrylate monomers and polymers used in dentistry might degrade from enzymolysis by acetylcholinesterase (ACHE), cholesterol esterase (CHE), porcine liver esterase (PRLE), and a pancreatic lipase (PNL). Short (hour) and long-term (day) exposures were performed. Product ratios were used to determine surface hydrolysis of the polymeric materials. Enzyme kinetics were studied for the monomers when challenged by ACHE, CHE, and PRLE. In the case of PRLE, the Vmax for the dimethacrylate substrates varied slightly, but amounted to as much as 10% of that of p-nitrophenylacetate. The Km for triethylene glycol dimethacrylate (TEGDMA) was 197 μM for ACHE and 1107 μM for CHE. The Vmax was 2.7 nmol/min for ACHE and 3.5 nmol/min for CHE. TEGDMA was converted by CHE at 2% the rate of cholesteryl oleate. Long-term incubations of monomers with CHE and ACHE produced degrees of hydrolysis that evidenced structure dependency in the ability of the enzymes to effect hydrolysis. Particularly resistant were aromatic derivatives and those with branching in methacrylate linkages. Overall, the study confirms the ability of physiol. important esterases to catalyze the hydrolysis of biomaterial methacrylates. The experimental process involved the reaction of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)(cas: 1985-51-9).Category: esters-buliding-blocks

The Article related to methacrylate biomaterial enzyme stability, Pharmaceuticals: Prosthetics and Medical Goods and other aspects.Category: esters-buliding-blocks

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

On September 30, 1976, Nagata, Katsuhisa published an article.Quality Control of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate) The title of the article was Studies on pour type resins for denture. I. Mechanical properties. And the article contained the following:

Crosslinking agents such as methacrylates added to dental resins at 2-3 mol% increased tensile, bending, and compressive strengths. Neopentylglycol dimethacrylate [1985-51-9] appeared to be the best crosslinking agent among 3 other agents tested. The experimental process involved the reaction of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)(cas: 1985-51-9).Quality Control of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)

The Article related to resin dental property crosslinking agent, Pharmaceuticals: Prosthetics and Medical Goods and other aspects.Quality Control of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)

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

On May 31, 1982, Suzuki, Shiro; Nakabayashi, Nobuo; Masuhara, Eiichi published an article.Product Details of 1985-51-9 The title of the article was The evaluation of new dental resins prepared with polyfunctional methacrylate monomers. And the article contained the following:

The combinations of several composite fillers and dimethacrylates for crown and bridge resins were investigated. The composite filler prepared from trimethylolpropane trimethacrylate (TMPT) markedly improved the mech. and phys. properties of crown and bridge resins. The enhancement of the mech. and phys. properties is due to the highly crosslinked structure which is developed with the use of the reactive composite filler which copolymerizes with the matrix monomer. The combination of the 2,2-bis(4-methacryloxypolyethoxyphenyl)propane  [41637-38-1], dimethacryloxyethyl(trimethylhexamethylene diurethane) [41137-60-4] comonomer and the TMPT composite filler exhibited the maximum compressive strength, transverse strength, and Brinell hardness, and min. abrasion loss and thermal expansion. This hard resin was superior to the resins currently available for clin. use. The experimental process involved the reaction of 2,2-Dimethylpropane-1,3-diyl bis(2-methylacrylate)(cas: 1985-51-9).Product Details of 1985-51-9

The Article related to dental resin polyfunctional methacrylate, Pharmaceuticals: Prosthetics and Medical Goods and other aspects.Product Details of 1985-51-9

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