Tag: M.W=400-500

Ulrich, Sebastian published the artcileNano-3D-printed photochromic micro-objects, Formula: C17H28O8S4, the main research area is three dimensional printed photochromic micro object; 3D-printing; donor-acceptor Stenhouse adducts; photochromism; thiol-ene reaction; two-photon polymerization.

Mol. photoswitches that can reversibly change color upon irradiation are promising materials for applications in mol. actuation and photoresponsive materials. However, the fabrication of photochromic devices is limited to conventional approaches such as mold casting and spin-coating, which cannot fabricate complex structures. Reported here is the first photoresist for direct laser writing of photochromic 3D micro-objects via two-photon polymerization The integration of photochromism into thiol-ene photo-clickable resins enables rapid two-photon laser processing of highly complex microstructures and facile postmodification using a series of donor-acceptor Stenhouse adduct (DASA) photoswitches with different excitation wavelengths. The versatility of thiol-ene photo-click reactions allows fine-tuning of the network structure and phys. properties as well as the type and concentration of DASA. When exposed to visible light, these microstructures exhibit excellent photoresponsiveness and undergo reversible color-changing via photoisomerization. It is demonstrated that the fluorescence variations of DASAs can be used as a reporter of photoswitching and thermal recovery, allowing the reading of DASA-containing sub-micrometric structures in 3D. This work delivers a new approach for custom microfabrication of 3D photochromic objects with molecularly engineered color and responsiveness.

Small published new progress about Charge transfer complexes Role: RCT (Reactant), RACT (Reactant or Reagent). 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

Zhao, Guoqi published the artcileImproving the interlaminar fracture toughness of carbon fiber/epoxy composites using clustered microcapsules, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is clustered microcapsule carbon fiber epoxy composite fracture toughness.

The composite laminates are susceptible to delamination between reinforcing plies during their long-term service. In this paper, we propose a modified carbon fiber/epoxy composite laminate with embedded clustered dual-component microcapsules in order to increase the interlaminar fracture toughness of the lamina. The details of microcapsules were illustrated using scanning electron microscope (SEM). The modified CF/EP composite laminates were fabricated using hot-compaction technique. Mode I interlaminar fracture tests were conducted using double cantilever beam specimens, then the values of opening fracture toughness GIC were calculated to evaluate the toughening effect of modified laminates. The toughening mechanism was revealed and discussed through micrographs of the fracture surfaces obtained by ultra-depth microscope and SEM. The results show that clustered microcapsules after polymerization are equal to special Z-pinning, significantly enhancing the ability of crack arrest, and largely and roundly improved the GIC values of resultant composite laminates. Meanwhile, the clustered microcapsules and matrix resin formed a second-phase material layer, which also absorbed the fracture energy and suppressed the expansion of cracks.

Polymer Testing published new progress about Aminoplasts Role: MOA (Modifier or Additive Use), PRP (Properties), USES (Uses). 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

Sathyan, Ashlin published the artcileRing-Opening Polymerization of Allyl-Functionalized Lactams, COA of Formula: C17H28O8S4, the main research area is ring opening polymerization allyl functionalized lactam.

Aliphatic polyamides containing pendent allyl groups were prepared by anionic ring-opening copolymerization of ε-caprolactam with substituted lactam 3-(3-propenyl)-2-azepanone (1). Copolymerization experiments revealed that up to 11 mol % of 1 was integrated successfully into these novel polyamides, which ranged in mol. weight from 27 to 72 kDa. Relative to the well-known com. polyamide-6 (PA-6), the degree of crystallinity of the copolymers decreased with incorporation of functional monomer. Moreover, the pendent allyl groups afforded rapid access to numerous functional aliphatic polyamides, using photoinitiated thiol-ene chem., providing a pathway to cross-linked polyamide films and gels.

Macromolecules (Washington, DC, United States) published new progress about Polyamides Role: PRP (Properties), SPN (Synthetic Preparation), PREP (Preparation). 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

Zhang, Huan published the artcileSuperstretchable Dynamic Polymer Networks, Application of Pentaerythritol tetra(3-mercaptopropionate), the main research area is superstretchable dynamic polymer network; dynamic crosslinks; polymer network; superstretchability.

Superstretchable materials have many applications in advanced technol. fields but are difficult to stretch to more than 1000× their original length. A superstretchable dynamic polymer network that can be stretched to 13 000× its original length is designed. It is revealed that superstretchability of the polymer network is derived from the synergistic effect of two different types of dynamic bonds, including a small number of strong dynamic imine bonds to maintain the network integrity during stretching and a large number of weak ionic hydrogen bonds to dissipate energy. This approach provides new insights into the design of superstretchable polymers.

Advanced Materials (Weinheim, Germany) published new progress about Butadiene rubber Role: PRP (Properties), RCT (Reactant), RACT (Reactant or Reagent). 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Application of Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ohzono, Takuya published the artcileEnhanced Dynamic Adhesion in Nematic Liquid Crystal Elastomers, Safety of Pentaerythritol tetra(3-mercaptopropionate), the main research area is dynamic adhesion nematic liquid crystal elastomer polyacrylic acrylic adhesive; adhesion; dynamic soft elasticity; liquid crystal elastomer; viscous dissipation.

Smart adhesives that undergo reversible detachment in response to external stimuli enable a wide range of applications in household products, medical devices, or manufacturing Here, a new model system for the design of smart soft adhesives that dynamically respond to their environment is presented. By exploiting the effect of dynamic soft elasticity in nematic liquid crystal elastomers (LCE), the temperature-dependent control of adhesion to a solid glass surface is demonstrated. The adhesion strength of LCE is more than double in the nematic phase, in comparison to the isotropic phase, further increasing at higher detachment rates. The static work of adhesion, related to the interfacial energy of adhesive contact, is shown to change very little within the explored temperature range. Accordingly, the observed enhanced adhesion in the nematic phase is primarily attributable to the increased internal energy dissipation during the detachment process. This adhesion effect is correlated with the inherent bulk dynamic-mech. response in the nematic LCE. The reported enhanced dynamic adhesion can lead to the development of a new class of stimuli-responsive adhesives.

Advanced Materials (Weinheim, Germany) published new progress about Acrylic rubber Role: PRP (Properties), SPN (Synthetic Preparation), PREP (Preparation). 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

Rossegger, E. published the artcilePhoto-switching of surface wettability on micropatterned photopolymers for fast transport of water droplets over a long-distance, Quality Control of 7575-23-7, the main research area is resin methacrylate water droplet photopolymer photoswitching wettability micropatterning.

The present work addresses the directional movement of water droplets (2 μL droplet) across a photopolymer surface over a distance of more than 20 mm. The long-distance movement of the droplet is achieved by inscribing multi-gradients onto the surface, which is realized by a photo-induced increase in wettability amplified by a change in surface texture. To create highly hydrophobic surface characteristics, photo-reactive resin formulations containing an o-nitrobenzyl alc. derivative with terminal acrylate groups, a multi-functional thiol and a fluorinated methacrylate monomer are patterned by visible light-assisted nanoimprint lithog. The needle-like surface microstructures in combination with the fluorine groups of the methacrylate monomer enable the formation of photopolymers with static water contact angles in the range of 140°. Along with the change in the chem. surface composition, prolonged UV exposure under air erodes the surface microstructures leading to fully wettable surfaces. The controlled photo-switching between highly hydrophobic (140°) and fully wettable (7°) photopolymer surfaces enables the introduction of wettability gradients by asym. UV irradiation Linear-shaped gradients rapidly drive a water droplet over a distance of 14 mm. By inscribing the wettability gradient in wedge-shaped patterns, a Laplace pressure gradient is addnl. formed, which allows a directed movement of water droplets over a distance of 22 mm.

Polymer Chemistry published new progress about Carboxylic acids Role: FMU (Formation, Unclassified), FORM (Formation, Nonpreparative). 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Quality Control of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Kang, Jingtian published the artcileControllable bistable smart composite structures driven by liquid crystal elastomer, Formula: C17H28O8S4, the main research area is liquid crystal elastomer smart composite simulation.

In this article, we proposed a new way to achieve monostable and bistable characteristics of composite layers based on liquid crystal elastomer (LCE). A smart trilayer composite structure is fabricated using LCE and acrylic elastomer, which can have several morphologies. It keeps flat at room temperature and can deform into a monostable saddle or bistable cylinder surface in response to simple temperature changes. The reversible deformation can be controlled through two parameters including geometrical size and actuation strain. The LCE can be programmed to generate different actuation strains by different formulas during synthesis or different mech. stretches during UV radiation. The deformed morphol. for different sample sizes and actuation strain is calculated using Finite element simulation. By comparison with the exptl. results, we confirm that the phenomena can be captured through numerical simulations. Furthermore, to have a quant. understanding, we use numerical simulation to calculate the deformation of the composite structure by tuning these two parameters and give a morphol. portrait illustrating the relationship between the deformed shape and control parameters.

Smart Materials and Structures published new progress about Deformation (mechanical). 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

Korkunova, Olga S. published the artcilePhotosensitive thiol-ene composition for DLP 3D printing of thermally stable polymer materials, HPLC of Formula: 7575-23-7, the main research area is photosensitive thiolene DLP 3D printing thermally polymer.

N-allylated derivatives with a modification degree of 80% were obtained by reacting poly[N,N’-(1,3-phenylene)isophthalamide] with allyl bromide in the presence of a strong base. Using the obtained functionalized polyamide and pentaerythritol tetrakis(3-mercaptopropionate), we formulated new photo- sensitive compositions capable of forming crosslinked structures due to UV-initiated thiol-ene polymerization High-resolution 3D objects that are heat resistant up to 380°C were formed using digital light processing (DLP) 3D printing.

Mendeleev Communications published new progress about Stress-strain relationship. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, HPLC of Formula: 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ghazali, Habibah published the artcileMicroencapsulated healing agents for an elevated-temperature cured epoxy: Influence of viscosity on healing efficiency, SDS of cas: 7575-23-7, the main research area is cured epoxy resin microencapsulated healing agent viscosity.

Elevated-temperature cured epoxy resins are widely used for high-performance applications especially for structural adhesive and as a matrix for structural composites. This is due to their superior chem. and mech. properties. The thermosetting nature of epoxy produces a highly crosslinked polymer network during the curing process where the resulting material exhibited excellent properties. However, due to this crosslinked mol. structure, epoxies are also known to be brittle, and once a crack initiated in the material, it is difficult to arrest the crack propagation. Earlier research found that the inclusion of encapsulated healing agents is able to introduce self-healing ability to the room-temperature cured epoxies. The current study investigated the self-healing behavior of an elevated-temperature cured epoxy, which incorporated the dual-capsule system loaded with bisphenol A diglycidyl ether (DGEBA) resin and mercaptan. The microcapsules were prepared by the in-situ polymerization method while the fracture toughness and the self-healing capability of the tapered-double-cantilever-beam (TDCB) epoxy specimens were measured under Mode-I fracture toughness testing. We investigated the effect of temperature on viscosity of the healing agents and how these values influence the formation of uniform healing on the fracture surfaces. It was found that incorporation of the dual-capsule self-healing onto an elevated-temperature cured epoxy slightly changed the fracture toughness of the epoxy as indicated by the Mode-I testing.

Polymers and Polymer Composites published new progress about Crack propagation. 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

Tezel, Ozge published the artcileDesign and development of self-healing coating based on thiol-epoxy reactions, Safety of Pentaerythritol tetra(3-mercaptopropionate), the main research area is self healing coating thiol epoxy microcapsule thermal wettability.

Cracks caused by the effects of mech. or chems. forces on coatings may cause their performance to deteriorate and may shorten their lifetime. The microcapsules used for self-healing coatings provide automatic recovery and extend the life of the coatings. In this study, polyurea-formaldehyde epoxy resin (PUF-epoxy) microcapsules were synthesized by in-situ polymerization; because, they allow the size control of the microcapsules, the thickness of the shell can be controlled, its production is easy, it is cheap and combinable with industry. Synthesized microcapsules were characterized by Fourier Transform IR Spectroscopy (ATR-FTIR), Thermogravimetric Anal. (TGA), SEM (SEM), optical microscope, UV spectrum, zeta analyzer and contact angle measurements. As a result of the thermal anal., the core (epoxy) content of the microcapsules was 57% by weight and 60% by the extraction method based on the principle of selective dissolution, and these two values were compatible with each other. The average microcapsule diameter was found as 185 nm. For the first time in the literature, an epoxy-containing microcapsule was added to the thiol-containing coating material and a self-healing coating was prepared The epoxy-containing microcapsules were artificially cracked and the epoxy resin released from it reacted with the thiol received in the coating. For this reason, it was observed that the artificial scratches formed on the coatings showed good self-healing properties.

Reactive & Functional Polymers published new progress about Coating materials (self-healing). 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