Tag: M.W=400-500

Borchers, Philipp S. published the artcileA Viologen Polymer and a Compact Ferrocene: Comparison of Solution Viscosities and Their Performance in a Redox Flow Battery with a Size Exclusion Membrane, Formula: C17H28O8S4, the main research area is bipyridine styrene polymer ferrocene containing pentaerythritol redox flow battery.

In this work, the synthesis and characterization of a compact, ferrocene tetramer and a linear viologen polymer is reported. The latter material is a new, 4,4′-bipyridine containing, organo-soluble polymer. As aimed for solubility in nonpolar solvents, a 2-ethylhexyl-moiety to promote organosoly. and 4-vinylbenzyl serving as a polymerizable group are introduced to a 4,4′-bipyridine. The halide anions of the monomer cation are exchanged to bis(trifluoromethansulfon)imide, which further enhances organosoly. The monomer is subsequently copolymerized with styrene by free radical polymerization In addition, a four-ferrocene-containing compact structure, based on pentaerythritol, is synthesized via the straightforward radical thiol-ene reaction. The polymer solutions are thoroughly characterized hydrodynamically. Subsequently, propylene carbonate-based solutions of both materials are prepared to allow an assessment for future energy storage applications. This is done by testing battery characteristics in a custom-made flow-cell with a simple dialysis membrane for phys. separation of the active materials. The capability of energy storage is verified by leaving the charged materials in solution in an open circuit for 24 h. Here, more than 99% of the stored charges can be recovered. Cycling the battery for 100 times reveals the remarkable stability of the materials of only 0.2% capacity loss per day in the battery setup.

Macromolecular Chemistry and Physics published new progress about Current density. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Formula: C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Sims, Samantha M. published the artcileCorrelating structure with ionic conductivity in bis(phosphonium)-containing [NTf2] thiol-ene networks, Related Products of alcohols-buliding-blocks, the main research area is correlating ionic conductivity phosphonium containing ionic liquid photopolymerization.

Thiol-ene photopolymerization was employed in order to prepare a series of covalently crosslinked bis(phosphonium)-containing poly(ionic liquid) (PIL) networks. While the counteranion was held constant (NTf2), the structure of the bis(phosphonium)-containing ‘ene’ monomer was varied in order to explore the breadth of thermal, mech. and conductive properties available for this system. Towards this end, it was determined that more flexible spacers within the cationic monomer led to PIL networks with lower Tg values and higher conductivities. Most notable was a two- to three-orders-of-magnitude increase in ionic conductivity (from 10-9 to 10-6 S cm-1 at 30 °C, 30% relative humidity) when the R group on phosphonium was changed from Ph to iso-Pr. Changing the functional group ratio to off-stoichiometry also led to a slight increase in conductivity Although the thermal stability (Td5%) of the phosphonium ionic liquid monomers was found to be significantly higher (>400 °C) than that of analogous imidazolium monomers, this improvement was not observed to directly transfer over to the polymer where a two-step decomposition pathway was observed The first step is attributed to the thiol monomer backbone while the second step correlates well with decomposition of the phosphonium portion of the PIL. © 2019 Society of Chem. Industry.

Polymer International published new progress about Dielectric loss. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Related Products of alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Barney, Christopher W. published the artcileFracture of model end-linked networks, Category: alcohols-buliding-blocks, the main research area is fracture model end network; Lake–Thomas theory; chain scission; gel mechanics; loop defects.

Advances in polymer chem. over the last decade have enabled the synthesis of molecularly precise polymer networks that exhibit homogeneous structure. These precise polymer gels create the opportunity to establish true multiscale, mol. to macroscopic, relationships that define their elastic and failure properties. In this work, a theory of network fracture that accounts for loop defects is developed by drawing on recent advances in network elasticity. This loop-modified Lake-Thomas theory is tested against both mol. dynamics (MD) simulations and exptl. fracture measurements on model gels, and good agreement between theory, which does not use an enhancement factor, and measurement is observed Insight into the local and global contributions to energy dissipated during network failure and their relation to the bond dissociation energy is also provided. These findings enable a priori estimates of fracture energy in swollen gels where chain scission becomes an important failure mechanism.

Proceedings of the National Academy of Sciences of the United States of America published new progress about Fracture energy. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Category: alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Yan, Bo published the artcilePluronic F127 gels fabricated by thiol-ene click chemistry: preparation, gelation dynamics, swelling behaviors and mechanical properties, Application In Synthesis of 7575-23-7, the main research area is Pluronic F127 fabricated thiol ene click chem gelation swelling.

Click chem. is an effective tool to fabricate three-dimensional gel network in an accurate way. In this work, Pluronic F127 gels are prepared by thiol-ene click chem., utilizing double-bond end-capped Pluronic F127 (F127DA) and pentaerythritol tetras-mercaptopropionate (PETMP) as the starting materials and triethylamine as the catalyst. Both the mass fraction of F127DA and the initial concentration of PETMP have effects on the properties of the resulting F127 gels. The optimized F127 gel prepared under a F127DA mass fraction of 15 wt% and a PETMP concentration of 17.62 mmol/L exhibits the highest swelling ratio (10) and has the largest elongation at break (194%). When the F127DA mass fraction and PETMP concentration are fixed at 15 wt% and 48.26 mmol/L, resp., the resulting F127 gel has a high stress of 0.25 MPa. The present example has presented a method to fabricate three-dimensional gel network in a controlled way.

Polymer Bulletin (Heidelberg, Germany) published new progress about Click chemistry. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Application In Synthesis of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Shin, Jaeman J. published the artcileEffect of site-specific functionalization on the shape of nonspherical block copolymer particles, Synthetic Route of 7575-23-7, the main research area is nonspherical butadiene styrene diblock copolymer particle functionalization shape; block copolymer; particle shape; site-specific functionalization; thiol-ene.

Shape-anisotropic polymeric colloids having chem. distinct compartments are promising materials, however, introducing site-sp. surface functionality to block copolymer particles has not yet been actively investigated. The current contribution demonstrates the selective surface functionalization of nanostructured, ellipsoidal polystyrene-b-polybutadiene (PS-b-PB) particle and investigate their effects on the particle shape. Photo-induced thiol-ene click reaction was used as a selective functionalization chem. for modifying the PB block, which was achieved by controlling the feed ratio of functional thiols to the double bonds in PB. Importantly, the controlled particle elongation was observed as a function of the degree of PB functionalization. Such an increase in the aspect ratio is attributed to the (i) increased incompatibility of the PS and modified PB block and (ii) the reduced surface tension between the particles and surrounding aqueous medium, both of which contributes to the further elongation of ellipsoids. Further tunability of the elongation behavior of ellipsoids was further demonstrated by controlling the particle size and chem. structure of functional thiols, showing the versatility of this approach for controlling the particle shape. Finally, the utility of surface functionality was demonstrated by the facile complexation of fluorescent dye on the modified surface of the particle via favorable interaction, which showed stable fluorescence and colloidal dispersity.

Polymers (Basel, Switzerland) published new progress about Click chemistry. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Synthetic Route of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Xu, Can published the artcileA class of azocarbazole-based carboxylates: high-efficiency ionic unimolecular photobase generators for thiol-epoxy click polymerization under blue light, Related Products of alcohols-buliding-blocks, the main research area is azocarbazole carboxylate ionic unimol photobase generator; thiol epoxy click polymerization blue light.

Two new unimol. azocarbazole-based visible photobase generators (Ac-C-Base) with different strong bases such as 1,5,7-triazabicyclo[4.4.0]dec-5-ene (TBD) and 1,1,3,3-tetramethylguanidine (TMG) as the potential active species were prepared Their structures were confirmed by 1H NMR, 13C NMR, and HR-MS. According to the photolysis and EPR results, Ac-C-Base could generate free radicals and strong bases simultaneously through the photodecarboxylation mechanism under 455 nm LED irradiation Thus they can effectively catalyze the thiol-epoxy polymerization without post exposure baking under light exposure. In addition, the Ac-C-TBD containing a stronger base shows a faster polymerization rate and higher epoxy conversion.

Journal of Polymer Science (Hoboken, NJ, United States) published new progress about Click chemistry. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Related Products of alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Rangamani, Adithya published the artcileEffect of backbone and end-group regioisomerism on thermomechanical properties of vanillin-based polyurethane networks, Application In Synthesis of 7575-23-7, the main research area is vanillin polyurethane network thermomech property.

Monomer composition, crosslink d., and crosslink distribution are the primary determinants of material properties in thermosetting networks. Here, we investigate the effect of regioisomerism and composition in polymeric networks via a recently developed scalable sequence-defined polyurethane macromer (SD-PUM) platform. The iterative, support-free SD-PUM platform facilitates the assembly of macromers with tunable backbones and pendant groups at the gram-scale. A series of SD-PUMs made with different end-groups and vanillin positional isomers were synthesized and crosslinked into thermosetting networks via multivalent thiol crosslinkers. The results show that the thermomech. properties of the ensuing networks are sensitive to the choice of regioisomer embedded in the SD-PUM backbone as well as the type of macromer end-group. When a crosslinker with higher functionality is employed, regioisomeric differences result in more pronounced changes in material properties. This work showcases the robustness of the SD-PUM platform and its use of backbone and end-group regioisomers to modulate material properties.

Polymer Chemistry published new progress about Complex modulus. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Application In Synthesis of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Jiang, Bing published the artcileWet-spun porous fibers from high internal phase emulsions: Continuous preparation and high stretchability, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is wet spun porous fiber internal phase emulsion stretchability.

Although high internal phase emulsion (HIPE)-templating is promising to prepare macroporous materials (polyHIPEs) with controllable shapes and tuneable property, fibrous polyHIPEs with stretchability and their continuous preparation are still challenging. Here, we report the fabrication of polyHIPE fibers in a continuous manner through wet spinning of HIPEs. The successful fabrication of polyHIPE fibers depends on HIPE dispersed phase fractions, ammonia-catalyzed interfacial reaction and wet spinning. Dry polyHIPE fibers exhibit tunable diameters, hierarchically porous structures, high stability to temperature and to various solutions, and high stretchability (with a high tensile strain of 155%), which is hard to achieve for polyHIPEs. The polyHIPE fibers show enhanced uptakes to both water (14.4 mL g-1) and organic solvents (up to 26.3 mL g-1), and the amphiphilic swelling is rare for polyHIPEs. Moreover, the dry polyHIPE fibers show good thermal insulation, similar to that of cotton. Simple wet spinning, combining with HIPEs with tuneable composition, is promising for preparing various polyHIPE fibers for various potential applications.

Journal of Polymer Science (Hoboken, NJ, United States) published new progress about Cotton textiles. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Liu, Cheng published the artcileRapidly reprogrammable actuation of liquid crystal elastomers, Name: Pentaerythritol tetra(3-mercaptopropionate), the main research area is liquid crystal elastomer reprogrammable actuation.

A rapid and reprogrammable alignment strategy for the reversible actuation of liquid crystal elastomers has been achieved through the phase-transition-induced shape memory effect. This breakthrough, recently reported in Advanced Materials by Xie and colleagues, illustrated the important role of shape-memory-induced stress regulation in developing and improving functional polymer materials.

Matter published new progress about Crystallization. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Name: Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Jeske, Madelyn P. published the artcileTwo-Photon Printing of Shape-Memory Microstructures and Metasurfaces via Radical-Mediated Thiol-Vinyl Hydrothiolation, Synthetic Route of 7575-23-7, the main research area is photon printing shape memory metasurface radical thiol vinyl hydrothiolation.

Shape-memory resists capable of high-resolution curing into arbitrarily designed structures are increasingly demanded for soft robotics, optical sensors, microscale manufacturing, and biomedicine. Amorphous, shape-memory thiol-vinyl networks are printed using two-photon polymerization (2PP) curing of a simple resin formulated with com. available reagents. The ability to print high-resolution feature sizes down to 200 nm is attributed to the use of radical-mediated, thiol-vinyl step-growth polymerization that quickly crosslinks the resin, limiting diffusive transport. The thermomech. behavior of the 2PP-cured material analyzed in compression, tension, and three-point bending is similar to the behavior of the UV-polymerized samples. To demonstrate the ability to design, field, and test 4D responsive microstructures, an array of nine springs with coil diameters of 330μm is printed. Following compressive shape-fixing, printed arrays can release 11μJ of stored elastic strain energy when reheated. Further, a new concept of dichroic-memory of a metamaterial device is demonstrated by printing a twisted woodpile structure with CD as characterized by Mueller Matrix ellipsometry. The results of this study demonstrate how combining high-resolution 2PP curing with stimuli-responsive mol. architectures can further the engineering of responsive microstructures and metamaterials.

Advanced Materials Technologies (Weinheim, Germany) published new progress about Click chemistry. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Synthetic Route of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts