Tag: M.W=400-500

Nowacka, Maria published the artcileThiol-ene addition of mercaptoalcohols to poly(vinylsiloxanes) under visible light photocatalysis – An approach towards cross-linkable hydrophilic silicones, Quality Control of 7575-23-7, the main research area is thiol addition mercaptoalc polyvinylsiloxane visible light photocatalysis crosslinking; silsesquioxane vinyl thiol crosslinking wearable electronic microfluidic.

Addition of thiol compounds bearing electron-withdrawing substituents linked to sulfur atom to vinyl-group containing organosiloxane polymers may be achieved without any catalyst or initiator, only on exposure to visible light. This approach allows for preparation of silicone copolymers with desired amount of unsaturated residues and hydrophilic groups. No detrimental side reactions involving vinyl substituents were observed Sp. surface energy of the obtained crosslinked films and their linear precursors is relatively low despite the presence of -OH groups, irresp. of their amount and the nature of the support. It makes the prepared copolymers interesting materials to be used as silicone inks for stretchable and wearable electronic devices as well as in microfluidics.

Polyhedron published new progress about Coating materials. 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

Shen, Peng published the artcileHard-soft thiol-ene materials without interfacial weakness, Product Details of C17H28O8S4, the main research area is hard soft thiolene click material PDMS mold prepared property.

Thiol-ene materials are a series of materials that can be crosslinked using a suitable photo-initiator and a UV light source. An advantage of thiol-ene materials is that they can be tailored to have specific mech. properties by controlling the stoichiometry of the mixtures By combination of different reactants, it is therefore, in principle, possible to prepare monoliths with greatly varying mech. properties from essentially the same material. In this paper, we prepared an alternating hard and soft thiol-ene material with a sharp solid interface. Tetrakis (3-mercaptopropionate) (PETMP) with 1, 3, 5-triallyl-1, 3, 5-triazine-2, 4, 6(1H, 3H, 5 H)-trione (TATATO) as the hard segment exhibited strong tensile and compressive strength but had low elongation and weak bending stiffness. A mixture of PETMP and trimethylolpropane diallyl ether (TMPDE) was selected as the soft segment. After stretching at 0.001 s-1 using a filament stretching rheometer (FSR), the soft segment fractured at the strain of 21%, while the interface of the materials was strong enough to prevent cracking.

Materials Today Communications 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, Product Details of C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ahangaran, Fatemeh published the artcileDevelopment of self-healing epoxy composites via incorporation of microencapsulated epoxy and mercaptan in poly(methyl methacrylate) shell, Category: alcohols-buliding-blocks, the main research area is epoxy mercaptan self healing agent PMMA microcapsule preparation property.

Self-healing composites based on epoxy resin containing poly(Me methacrylate) (PMMA) microcapsules filled with healing agents were prepared The effect of healing agents microcapsules on mech. properties and self-healing behavior of epoxy composites were investigated in this work. Epoxy and mercaptan as curing agent were microencapsulated in PMMA shell as two-component healing agent through internal phase separation method, and then, epoxy composites containing 2.5, 5, 7.5 and 10 wt% of healing agent microcapsules were prepared The fracture toughness and healing efficiency of these composites were measured using a tapered double cantilever beam (TDCB) specimen. The results indicated that about 80% healing efficiency was achieved with 10 wt% PMMA microcapsules at room temperature after 24 h. The tensile strength of the epoxy with 2.5 wt% PMMA microcapsules increased initially and then decreased gradually with increasing microcapsules content up to 10 wt% PMMA microcapsules. DSC results also indicated that this system has good potential for spontaneous self-healing performance at room temperature

Polymer Testing 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, Category: alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Tratnik, Nicole published the artcileRecyclable, self-strengthening starch-based epoxy vitrimer facilitated by exchangeable disulfide bonds, Quality Control of 7575-23-7, the main research area is recycling starch epoxy vitrimer disulfide tensile crosslinking.

Epoxy vitrimers have emerged as a new class of self-healing, recyclable, and reprocessable materials, offering new opportunities to traditional epoxy thermosets by improving life-span, while providing addnl. functionalities. Nevertheless, retaining 100% of the original mech. performances remains difficult for vitrimers after several reprocessing cycles due to progressive changes in the vitrimer networks during rearrangements. In this study, we designed a novel epoxy vitrimer with a higher renewable content compared to conventional epoxies by using renewable materials. The bio-based epoxy vitrimer was synthesized from epoxidized starch amylopectin together with diallyl disulfide, that is naturally found in garlic, and a thiol (pentaerythritol tetrakis(3-mercaptopropionate) (PETMP)). Diallyl disulfide and PETMP enabled the formation of a recyclable, and reprocesseable, vitrimer network. The epoxy vitrimer displayed unprecedented self-strengthening after 5 recycling cycles (tensile strength increased over 900%) caused by the mech.-induced homogeneization of the diallyl disulfide/thiol and the starch epoxy ghost granule phases during the recycling process, thereby increasing the vitrimer crosslinking d. during reformation. Reprocessing the vitrimer 5-times improved the mech. and thermal properties, raising glass transition temperature, Young’s modulus, and tensile strength from 7°C to 25°C, 2.98 MPa to 268 MPa, and 1.87 MPa to 18.47 MPa, resp. Hence, capitalizing on mech.-induced phase homegeneization during the vitrimer reprocessing, this work introduces a strategy for the design of self-strengthening bio-based and recyclable thermosets.

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about Crosslink density. 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

Luo, Chaoqian published the artcileReal-Time Alignment and Reorientation of Polymer Chains in Liquid Crystal Elastomers, Application In Synthesis of 7575-23-7, the main research area is real alignment reorientation polymer chain liquid crystal elastomer; Fourier-transform infrared spectroscopy; Mesogen alignment; liquid crystal elastomer; polarized optimal measurements; real-time characterization; reorientation.

Liquid crystal elastomers (LCEs) exhibit soft elasticity due to the alignment and reorientation of mesogens upon mech. loading, which provides addnl. mechanisms to absorb and dissipate energy. This enhanced response makes LCEs potentially transformative materials for biomedical devices, tissue replacements, and protective equipment. However, there is a critical knowledge gap in understanding the highly rate-dependent dissipative behaviors of LCEs due to the lack of real-time characterization techniques that probe the microscale network structure and link it to the mech. deformation of LCEs. In this work, we employ in situ optical measurements to evaluate the alignment and reorientation degree of mesogens in LCEs. The data are correlated to the quant. phys. anal. using polarized Fourier-transform IR spectroscopy. The time scale of mesogen alignment is determined at different strain levels and loading rates. The mesogen reorientation kinetics is characterized to establish its relationship with the macroscale tensile strain, and compared to theor. predictions. Overall, this work provides the first detailed study on the time-dependent evolution of mesogen alignment and reorientation in deformed LCEs. It also provides an effective and more accessible approach for other researchers to investigate the structural-property relationships of different types of polymers.

ACS Applied Materials & Interfaces published new progress about Crosslink density. 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

Tian, Guangming published the artcileAn investigation on sunlight-induced shape memory behaviors of PCL/TiN composites film, Safety of Pentaerythritol tetra(3-mercaptopropionate), the main research area is polycaprolactone titanium nitride composite film shape memory behavior.

Plasmonic materials possess good optical properties in effectively converting solar energy into heat, here a series of sunlight responsive shape memory composites films based on acrylate-terminated Poly(ε-caprolactone) (PCL) and titanium nitride nanoparticles (TiN NPs) are prepared via base-catalyzed Michael addition Compared with conventional free radical polymerization or phys. blending, this paper constructs a network architecture from view of structural controllability, favoring a subsequent flexible and elastic materials as well as fine dispersion of TiN NPs in the crosslinked networks, the resultant materials show an outstanding mech. and the incorporated TiN NPs enable rapid temperature increase over the melting temperature of PCL and trigger the shape change of the composite with good shape recovery rate. The effect of light d. and TiN NPs concentration on composite film are elucidated and investigated systematically, it is found that the amount of TiN NPs content virtually has a negligible effect on the surface temperature of the films when subjected to a specific illumination, however, light intensity has a remarkable influence on it. Furthermore, an electronics device switch actuated by 160 mw cm-2 simulated sunlight irradiation is demonstrated and envisioned for flexible electronic applications.

Smart Materials and Structures published new progress about Crosslink density. 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

Zhang, Yijia published the artcileA Systematic comparison of in vitro cell uptake and in vivo biodistribution for three classes of gold nanoparticles with saturated PEG coatings, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is gold nanoparticle PEG coating cell uptake macrophage biodistribution clearance.

Due to the cost, time, and impact on the animals for in vivo studies, the nanoparticle field predominantly uses cellular uptake assays as a proxy to predict in vivo outcomes. Extensive research has focused on decreasing macrophage uptake in vitro as a proxy to delay nanoparticle accumulation in the mononuclear phagocytic system (MPS), mainly the liver and spleen, and thereby increase tumor accumulation. We further found that this extremely low cellular uptake could be recapitulated on solid gold nanoparticles by densely coating their surface with small mols. Here we report our studies on the biodistribution and clearance of these materials in comparison to more conventional PEGylated gold nanoparticles. It was expected that the remarkably low macrophage uptake in vitro would translate to extended blood circulation time in vivo, but instead we found no correlation between either surface coverage or in vitro macrophage cell uptake and in vivo blood circulation. Gold nanoaggregates accumulate more rapidly and to a higher level in the liver compared to control gold nanoparticles. The lack of correlation between in vitro macrophage uptake and in vivo blood circulation suggests that the field must find other in vitro assays to use as a primary proxy for in vivo outcomes or use direct in vivo experimentation as a primary assay.

PLoS One published new progress about Biological uptake. 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

Wang, Kaili published the artcileEditable shape-memory transparent wood based on epoxy-based dynamic covalent polymer with excellent optical and thermal management for smart building materials, Safety of Pentaerythritol tetra(3-mercaptopropionate), the main research area is editable shape memory transparent wood epoxy dynamic covalent polymer; optical thermal management smart building material.

Transparent wood (TW) with excellent optical and thermal management performance has been recently developed as a promising energy-efficient building material. Here, editable shape-memory TW (ESMTW) is developed through in situ polymerization of epoxy-based dynamic covalent polymers (EDCP) into a delignified wood scaffold. ESMTW possesses stiffness at low temperature and flexibility at high temperatures, while it exhibits excellent solid-state plasticity and shape-manipulation capability under thermal stimuli. Meanwhile, ESMTW shows unique light guiding and directional scattering effects, and the transmitted light intensity distribution is tunable owing to the shape-management capability. Addnl., the resultant TW possesses great thermal insulation properties. The combination of characteristics enables TW to exhibit great promise as an advanced functional and intelligent building material toward a sustainable society, especially for three-dimensional applications (e.g., curved or irregularly shaped glass, windows, ceilings, rooftops.). It may also provide new ideas for fabricating transparent and shape-editable optical/electronic devices.

Cellulose (Dordrecht, Netherlands) published new progress about Breaking strength. 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

Mansouri, Mahsa published the artcileGas permeation properties of highly cross-linked castor oil-based polyurethane membranes synthesized through thiol-yne click polymerization, Related Products of alcohols-buliding-blocks, the main research area is gas permeation castor oil polyurethane membrane.

In this paper, a new chem. approach was developed for synthesis of castor oil (CO)-based polyurethane (PU) membranes to attain improved structural properties for gas separation applications. For this purpose, propyne-terminated CO-based PU prepolymer (PTPU) was synthesized by the reaction of CO and isophorone diisocyanate (IPDI), followed by propargyl alc. (PrAl) and isocyanate (NCO) terminated prepolymer reaction. The ultimate membranes were prepared through thiol-yne crosslinking reaction of PTPU and pentaerythritol tetrakis (3-mercaptopropionate) (PETMP), in presence of azobisisobutyronitrile (AIBN), as a reaction initiator. It was revealed that mech. and thermal properties of the prepared membranes were improved owing to the formation of flexible thioether linkages through crosslinking reaction. The gas permeation measurements were carried out in the temperature and pressure ranges of 298-338 K and 200-1200 kPa, resp. The results exhibited reverse size selective performance, as a typical transport behavior of rubbery membranes. The infinite dilution permeability coefficient of CO2 at 298 K was found identical to 2.78 Barrer, along with the infinite dilution perm-selectivity values for CO2/CH4 and CO2/H2 obtained equal to 25.27 and 7.94, resp. Furthermore, higher permeation activation energies were found in this work compared to a number of crosslinked rubbery membranes in the literature, such as poly (dimethylsiloxane) (PDMS) and poly(ethylene glycol) diacrylate (PEGDA).

Reactive & Functional Polymers 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, Related Products of alcohols-buliding-blocks.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Gablier, Alexandra published the artcileRates of transesterification in epoxy-thiol vitrimers, Product Details of C17H28O8S4, the main research area is epoxy thiol vitrimer transesterification elastomer thermal mech property.

Vitrimers, an important subset of dynamically crosslinked polymer networks, have many technol. applications for their excellent properties, and the ability to be re-processed through plastic flow above the so-called vitrification temperature We report a simple and efficient method of generating such adaptive crosslinked networks relying on transesterification for their bond exchange by utilizing the ‘click’ chem. of epoxy and thiols, which also has the advantage of a low glass transition temperature We vary the chem. structure of thiol spacers to probe the effects of concentration and the local environment of ester groups on the macroscopic elastic-plastic transition. The thermal activation energy of transesterification bond exchange is determined for each chem. structure, and for a varying concentration of catalyst, establishing the conditions for the optimal, and for the suppressed bond exchange. However, we also discover that the temperature of elastic-plastic transition is strongly affected by the stiffness (dynamic rubber modulus) of the network, with softer networks having a much lower vitrification temperature even when their bond-exchange activation energy is higher. This combination of chem. and phys. control factors should help optimize the processability of vitrimer plastics.

Soft Matter 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, Product Details of C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts