Tag: M.W=400-500

Garg, Mayank published the artcileSacrificial Cyclic Poly(phthalaldehyde) Templates for Low-Temperature Vascularization of Polymer Matrices, Application In Synthesis of 7575-23-7, the main research area is sacrificial cyclic polyphthalaldehyde template temperature vascularization polymer matrice.

Sacrificial polymers that depolymerize into small mols. upon exposure to an external stimulus facilitate the fabrication of synthetic structures with embedded vascular networks. Many sacrificial polymers such as poly(lactic acid) (PLA) and polycarbonates possess high thermal stability, leading to a time- and energy-intensive vascularization process. Furthermore, the use of these polymer templates is limited to high-temperature-resistant (>180°C) matrixes. Here, we demonstrate the rapid vascularization of a range of host matrixes through the thermally triggered depolymerization of cyclic poly(phthalaldehyde) (cPPA) at temperatures near 100°C. Complete mass loss of solvent-cast cPPA films is observed within 2 h at 100°C in a thermogravimetric analyzer and after embedding in poly(dicyclopentadiene) matrixes. The thermal processing of cPPA into sacrificial templates for inverse vascular architectures is hindered due to depolymerization at low temperatures We successfully overcome these templating challenges by using solution spinning and 3D printing to fabricate fibers and printed templates, resp. Microchannels are created inside lowglasstransition temperature (42 and 65°C) epoxy-based matrixes by depolymerizing the embedded fibers and printed templates within 1 h at 110°C. This low-temperature cPPA evacuation protocol enables the vascularization of matrixes that would not survive the harsh thermal cycle required for depolymerizing existing sacrificial polymers. Moreover, cPPA depolymerization affords a fivefold reduction in the thermal energy consumed during template removal compared to PLA.

ACS Applied Polymer Materials published new progress about Activation energy. 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

Grewal, Manjit Singh published the artcileBifunctional poly(ethylene glycol) based crosslinked network polymers as electrolytes for all-solid-state lithium ion batteries, SDS of cas: 7575-23-7, the main research area is PEG crosslinked network polymer solid state lithium ion battery.

Polymer electrolyte based lithium ion batteries represent a revolution in the battery community due to their intrinsic enhanced safety, and as a result polymer electrolytes have been proposed as a replacement for conventional liquid electrolytes. Herein, the preparation of a family of crosslinked network polymers as electrolytes via the ‘click-chem.’ technique involving thiol-ene or thiol-epoxy is reported. These network polymer electrolytes comprise bifunctional poly(ethylene glycol) as the lithium ion solvating polymer, pentaerythritol tetrakis (3-mercaptopropionate) as the crosslinker and lithium bis(trifluoromethane)sulfonimide as the lithium salt. The crosslinked network polymer electrolytes obtained show low Tg, high ionic conductivity and a good lithium ion transference number (ca 0.56). In addition, the membrane demonstrated sterling mech. robustness and high thermal stability. The advantages of the network polymer electrolytes in this study are their harmonious characteristics as solid electrolytes and the potential adaptability to improve performance by combining with inorganic fillers, ionic liquids or other materials. In addition, the simple formation of the network structures without high temperatures or light irradiation has enabled the practical large-area fabrication and in situ fabrication on cathode electrodes. As a preliminary study, the prepared crosslinked network polymer materials were used as solid electrolytes in the elaboration of all-solid-state lithium metal battery prototypes with moderate charge-discharge profiles at different current densities leaving a good platform for further improvement. © 2018 Society of Chem. Industry.

Polymer International published new progress about Activation energy. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, SDS of cas: 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Chen, Kai published the artcileA semi-interpenetrating network polymer electrolyte membrane prepared from non-self-polymerized precursors for ambient temperature all-solid-state lithium-ion batteries, Computed Properties of 7575-23-7, the main research area is PEG semi interpenetrating network electrolyte membrane lithium battery.

Solid polymer electrolytes (SPEs) are currently attracting widespread interest for lithium battery applications due to high safety, low volatility, and the ability to suppress Li dendrites. Herein, a novel all-solid-state polymer electrolyte with semi-interpenetrating network (semi-IPN) structure has been prepared The semi-IPN SPE is fabricated by thiol-tosylate polycondensation of pentaerythritol terakis (3-mercaptopropionate) (PETMP) with non-self-polymerized precursors, ditosylate poly (ethylene glycol) (DTsPEG) and p-toluenesulfonyl poly (ethylene glycol) Me ether (TsPEGME), and then blended with a high mol. weight polyethylene oxide (PEO, Mw = 300 kg mol-1). The resulting self-standing membrane achieves an excellent ionic conductivity (1.3 x 10-4 S cm-1) at ambient temperature, and exhibits an electrochem. stability window up to 4.3 V vs. Li/Li+. The LiFePO4/semi-IPN-SPE/Li battery exhibits a first discharging capacity of 143.1 mA h g-1 at 0.2C and the discharge capacity keeps 134 mA h g-1 after 100 charge and discharge cycles.

Journal of Solid State Chemistry published new progress about Activation energy. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Computed Properties of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Li, Qiong published the artcileConcurrent thiol-ene competitive reactions provide reprocessable, degradable and creep-resistant dynamic-permanent hybrid covalent networks, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is polythioacetal polythioether green chem degradation creep resistance recycling thermostability.

A catalyst-free, solvent-free thiol-ene addition reaction was developed to produce a dynamic-permanent hybrid cross-linked polymer from two simple components, a tetrathiol and a divinyl ether, in one pot. The tetrathiol and divinyl ether underwent two competitive Markovnikov and anti-Markovnikov addition reactions simultaneously and sep. generated S,O-thioacetal cross-links and thioether cross-links. The dynamic feature of S,O-thioacetal cross-links imparts excellent malleability, reprocessability and degradability to the obtained network, and the permanent covalent thioether cross-links provide favorable high-temperature creep resistance. This work will broaden the thiol-ene chem. and provide a green method to achieve recyclable cross-linked polymers and covalent adaptable networks (CANs) or vitrimer-like materials with high-temperature creep resistance.

Green Chemistry published new progress about Activation energy. 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

Lin, Xueyan published the artcileImine-Based Reactive Mesogen and Its Corresponding Exchangeable Liquid Crystal Elastomer, Formula: C17H28O8S4, the main research area is imine reactive mesogen corresponding exchangeable liquid crystal elastomer.

To date, exchangeable liquid crystalline elastomers (xLCEs) are mainly fabricated by combining conventional LCEs with addnl. exchangeable functional groups in their networks. While conventional LCEs are frequently made from com. available aromatic-ester reacting mesogens, or from mesogens based on biphenyl core, such reacting monomers are not optimized to fabricating xLCEs whose bond-exchange reaction is fast and clean-cut. Here, we develop a fast synthesis route to produce a new type of reactive mesogen based on an aromatic-imine structure that intrinsically enables a fast and stable bond-exchange reaction in the resulting imine-based xLCE. This new xLCE displays vitrimer plastic-flow behavior and its bond-exchange activation energy is calculated to be 54 kJ/mol. We also demonstrate that this xLCE is thermally stable, to withstand many recycling cycles without visible decay, and its liquid crystallinity is preserved. Finally, we demonstrate the reprogramming and realignment of mesogen orientation in this xLCE, with the realigned xLCE capable of reversible thermal actuation.

Macromolecules (Washington, DC, United States) published new progress about Activation energy. 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

Zhang, Huan published the artcileRecyclable, Self-Healing, Thermadapt Triple-Shape Memory Polymers Based on Dual Dynamic Bonds, Safety of Pentaerythritol tetra(3-mercaptopropionate), the main research area is recyclable self healing thermadapt triple shape memory dynamic bond; butadiene rubber modified double bond dynamic; dynamic bond; recyclability; self-healing; solid-state plasticity; triple-shape memory.

Fabricating a single polymer network with a combination of a multi-shape memory effect (multiple-SME), solid-state plasticity, recyclability and self-healing behavior remains a challenge. We designed imine bond and ionic hydrogen bond dual crosslinked polybutadiene (PB) networks. The resulting PB networks showed a triple-shape memory effect, where imine bonds could be used to fix the permanent shape and ionic hydrogen bonds and glass transition acted as the transition segments for fixing/releasing the temporary shapes. Addnl., the dual dynamic bonds offered PB networks outstanding solid-state plasticity, recyclability and self-healing behavior. This strategy provides some insights for preparing shape memory polymers integrating multiple-SME and multi-functionality.

ACS Applied Materials & Interfaces published new progress about Activation energy. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Safety of Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Dai, Jianxun published the artcileUltrafast Response Polyelectrolyte Humidity Sensor for Respiration Monitoring, Category: alcohols-buliding-blocks, the main research area is polyelectrolyte humidity sensor respiration monitoring; breath monitoring; click reaction; in situ preparation; polyelectrolyte humidity sensors; ultrafast response.

Respiration monitoring is important for evaluating human health. Humidity sensing is a promising way to establish a relationship between human respiration and elec. signal. This work describes polymer humidity sensors with ultrafast response for respiration monitoring. The humidity-sensitive polyelectrolyte is in situ cross-linked on the substrate printed with interdigitated electrodes by a thiol-ene click reaction. The polyelectrolyte humidity sensor shows rapid water adsorption/desorption ability, excellent stability, and repeatability. The sensor with ultrafast response and recovery (0.29/0.47 s) when changing humidity between 33 and 95% shows good application prospects in breath monitoring and touchless sensing. Different respiration patterns can be distinguished, and the breath rate/depth of detection subjects can also be determined by the sensor. In addition, the obtained sensor can sense the skin evaporation in a noncontact way.

ACS Applied Materials & Interfaces published new progress about Breathing (animal). 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

Acosta Ortiz, Ricardo published the artcileTensile strength and fracture mode I toughness of photocurable carbon fiber/polyether-polythioether composites, Computed Properties of 7575-23-7, the main research area is carbon fiber polyether polythioether composite tensile strength fracture toughness.

This paper reports the development of a novel photocurable carbon fiber/polyether-polythioether (TF CFEC) composite and the comparison of its mech. performance with that of a conventional thermally cured carbon fiber-epoxi composite (CTC CFEC). Unidirectional carbon fiber (CF) was used as the reinforcement agent in both composites. In the case of the TF CFEC, the CF employed was surface-functionalized with thiol groups to promote chem. bonding to the polyether-polythioether matrix derived from the epoxy/thiol-ene system. This was achieved by means of a transesterification reaction of (3-mercaptopropyl) trimethoxysilane (MPTS) with the hydroxyl groups produced on the surface of the CF after an oxidative plasma treatment. Mech. testing revealed that although TF CFEC displayed slightly lower mech. properties than CTC CFEC, it exhibited 50% higher fracture toughness. This difference in behavior was explained by the difference in the chem. nature of both polymeric matrixes, where a highly crosslinked poly(hydroxyl-amine) is produced in the case of CTC CFEC, while a polyether-polythioether matrix with inherent toughness due to the flexibility of polythioethers, is obtained during the photo-thermal treatment to obtain TF CFEC. Considering that TF CFEC was cured in only 1h at 40 mW/cm2 of UV intensity and 85°C, and the CTC CFEC was cured at room temperature for 4h, followed by heating at 100°C for 4h, there is considerable energy savings in the production of the photocurable composite. The result is a cost-effective process that could have potential applications in the automotive and aerospace industries.

Journal of Polymer Research published new progress about Aerospace industry. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Computed Properties of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Yeo, Hyunki published the artcilePhotoinduced proton-transfer polymerization: a practical synthetic tool for soft lithography applications, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is photopolymerization proton transfer nanoimprint lithog base catalysis.

Proton-transfer photopolymerization through the thiol-epoxy “”click”” reaction is shown to be a versatile new method for the fabrication of micro- and nanosized polymeric patterns. In this approach, complexation of a guanidine base, diazabicycloundecene (DBU), with benzoylphenylpropionic acid (ketoprofen) generates a photolabile salt. Under illumination at a wavelength of 365 nm, the salt undergoes a photodecarboxylation reaction to release DBU as a base. The base-catalyzed ring opening reaction then creates cross-linked poly(β-hydroxyl thio-ether) patterns. The surface chem. of these patterns can be altered through alkylation of the thio-ether linkages. For example, a reaction with bromoacetic acid produces a hitherto unknown sulfonium/carboxylate-based zwitterionic motif that endows antibiofouling capacity to the micropatterns.

Journal of the American Chemical Society published new progress about Antifouling agents. 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

Kim, Soyoun published the artcileModulation of Interfacial Adhesion Using Semicrystalline Shape-Memory Polymers, COA of Formula: C17H28O8S4, the main research area is interfacial adhesion semicrystalline shape memory polymer.

Semicrystalline shape-memory elastomers are molded into deformable geometrical features to control adhesive interactions between elastomers and a glass substrate. By mech. and thermally controlling the deformation and phase-behavior of molded features, we can control the interfacial contact area and the interfacial adhesive force. Results indicate that elastic energy is stored in the semicrystalline state of deformed features and can be released to break attractive interfacial forces, automatically separating the glass substrate from the elastomer. Our findings suggest that the shape-memory elastomers can be applied in various contact printing applications to control adhesive forces and delamination mechanics during ink pickup and transfer.

Langmuir published new progress about Adhesion, physical. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, COA of Formula: C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts