Tag: M.W=400-500

Zhang, Pei published the artcile4D Chiral Photonic Actuators with Switchable Hyper-Reflectivity, Application In Synthesis of 7575-23-7, the main research area is chiral photonic actuator switchable hyper reflectivity.

Cholesteric liquid crystals (CLCs) are chiral photonic materials reflecting only circularly polarized light with the same handedness as the helical polymer structure. Concurrent shape and color changes can be achieved using CLCs, but the fabrication of CLCs with switchable 3D shape, structural color, and hyper-reflectivity, i.e., reflecting both left- and right-handed circularly polarized light simultaneously, has not yet been achieved. Here, CLC elastomer (CLCE) actuators are reported to reflect equal amounts of left- and right-handed circularly polarized light. Hyper-reflectivity is achieved by uniaxially stretching the partially crosslinked film to induce helix deformation which is then fully crosslinked to fix the deformed helical structure. The shape, structural color, and hyper-reflectivity of the polymer film are switchable with temperature At high temperatures, only right-handed circularly polarized light is reflected and the color is red shifted. The film can be shaped in three dimensions: a structural colored 3D shaped beetle is fabricated using molding, which reflects both left- and right-handed circularly polarized light and shows reversible, temperature responsive structural color and 3D shape changes. Hence, 4D engineered bioinspired multifunctional materials are fabricated, which are interesting for applications ranging from sensing actuators to switchable hyper-reflective films and objects.

Advanced Functional Materials published new progress about Actuators. 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

Zhao, Tonghui published the artcileHelical Liquid Crystal Elastomer Miniature Robot with Photocontrolled Locomotion, Product Details of C17H28O8S4, the main research area is liquid crystal elastomer soft robot photomobility.

Miniature liquid crystal elastomer (LCE) based soft robots with multidirectional locomotion ability and multifunctionality have captured the extensive interest of researchers for a wide range of potential applications. Generally, the subsistent actuation modes for most LCE soft robots present several simple shape-changing under external stimuli. Although elaborately designed for complicated structures, they still achieve limited mobility, restricting the practical applications severely. Herein, a photo-controllable helical soft robot (PHSR) prepared with near-IR (NIR) light active LCE is reported. The 3D helical architecture of PHSR is constructed by manually twisting the LCE strip. The irradiation of NIR light transforms the basic reversible shape deformations (shrinking/elongating, winding/unwinding, and bending) of PHSR to macroscopic photomobility. As the torsional orientation of mesogens generated by manually twisting process, the rolling direction can be controlled by the scanning direction of the NIR spot. The flexible steering motion is in favor of performing various tasks such as traversing gap, climbing, and outputting mech. work, suggesting that PHSR with directional photomobility and multifunction can be extended to a variety of applications.

Advanced Materials Technologies (Weinheim, Germany) published new progress about Actuators. 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

Merkel, Daniel R. published the artcileMechanical energy dissipation in polydomain nematic liquid crystal elastomers in response to oscillating loading, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is nematic liquid crystal elastomer oscillating loading; polyester polythioether rubber nematic oscillating loading actuator.

Liquid crystal elastomers (LCEs) exhibit exotic mech. behaviors such as reversible actuation, elevated loss tangent above the glass transition, and soft elasticity; however, LCEs have yet to be thoroughly investigated under high-strain cyclic loading. This study explores a main-chain polydomain nematic elastomer synthesized from a thiol-acrylate Michael-addition reaction in the nematic state. Low-strain (i.e., <0.2%) dynamic mech. anal. and creep behavior was used to help link viscoelasticity and mesogen reorientation to high-strain cyclic loading. Specifically, the behavior was compared at discrete temperatures below the glass transition, in the nematic-rubbery regime, and in the isotropic-rubbery regime. Creep behavior in the nematic-rubbery regime was modeled using two characteristic relaxation times, which decreased with increasing temperature (τ1, τ2 (19 °C) = 140 s, 16 s, and τ1, τ2 (62 °C) = 2.4 s, 0.6 s). Samples were repeatedly loaded to 50 kPa at 5 cycles/min at each temperature for 350 cycles. In the rubbery nematic state at 62 °C, low threshold stress and short relaxation times allowed reversible domain reorientation between each cycle, resulting in a repeatable stress-strain curve with high hysteresis (220 kJ/m3). In contrast, the 19 °C and 39 °C conditions in the rubbery nematic state demonstrated ratcheting behavior in response to cyclic loading, which lowered the hysteresis values with increased cycling. The findings presented here represent the first investigation into mech. energy dissipation in main-chain nematic LCEs under large oscillating stress conditions. Overall, this study helps to better understand the role LCEs can play in energy dissipating applications with high values of strain and varying temperature Polymer published new progress about Actuators. 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

Russo, C. published the artcileShape-memory actuators based on dual-curing thiol-acrylate-epoxy thermosets, HPLC of Formula: 7575-23-7, the main research area is thiol epoxy acrylate thermoset preparation actuator mech thermal property.

In this work, new shape-memory thermosets were developed using a thiol-acrylate-epoxy dual-curing system. A previously studied system has been successfully modified, introducing different amounts of tri(2,3-epoxypropyl)isocyanurate (ISO) and bisphenol A glycerolate (1 glycerol/phenol) diacrylate (BAGA) in order to enhance the thermomech. properties and the glass transition temperature of the final materials. Preliminary studies on the curing process proved that the curing process is not affected, and the critical ratio remains unchanged. Glass transition temperatures and thermomech. properties were successfully improved, extending the applicability of these thermosets to the field of soft-actuator. Shape-memory behavior was comprehensively investigated in unconstrained, fully and partially constrained conditions. Unconstrained experiment results showed excellent shape fixation and recovery, coupled with a fast recovery process. On the other hand, fully and partially constrained recovery experiments evidenced optimal performances obtained by the combination of both high crosslinking d. and high deformability in the programming stage. Considerably high values of recovery stress (up to 7 MPa) and work output (up to 1300 kJ/m3) were found confirming the high potentiality of these dual-cured thermosets in the field of soft-actuation.

eXPRESS Polymer Letters published new progress about Actuators. 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

Abakeviciene, Brigita published the artcileFree-standing composite films based on thiol-ene and PEDOT: PSS layers for optoelectronic applications, Category: alcohols-buliding-blocks, the main research area is poly ethylenedioxythiophene styrenesulfonate composite film optoelectronic application; PEDOT:PSS; PETMP-TTT; composite; free-standing film; layers; mechanical properties.

Free-standing composite films were fabricated by combining the plane parallel layers of thiol-ene based on pentaerythritol tetrakis(3-mercaptopropionate)-1,3,5-triallyl-1,3,5-triazine-2,4,6(1H,3H,5H)-trione (PETMP-TTT) UV curable polymer and poly(3,4-ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) conductive polymer. A systematic anal. was performed with the focus on mech. performance of the free-standing composite films. The PEDOT:PSS/PETMPTTT composite exhibited higher values of adhesion force compared to the free-standing PETMP-TTT film due to hydrophilic nature of the PEDOT:PSS layer. The composite was found to be highly transparent in the range of 380-800 nm. The Young’s modulus and tensile strength of PETMP-TTT were found to be 3.6 ±0.4 GPa and 19± 3 MPa, while for PEDOT:PSS/PETMP-TTT to be 3.5± 0.3 GPa and 20± 3 MPa, resp. The sheet resistance values of the PEDOT:PSS layer in the composite film were found to be highly stable after a number of bending iterations with slight increase in sheet resistance from 108 to 118 ± 2 Ω/Ω. The resultant PEDOT:PSS/PETMP-TTT composite can be further used in optoelectronic applications.

Polymers (Basel, Switzerland) published new progress about Composites. 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

Zhang, Yijia published the artcileColloidal Capsules Assembled from Gold Nanoparticles Using Small-Molecule Hydrophobic Cross-linkers, Application of Pentaerythritol tetra(3-mercaptopropionate), the main research area is gold nanoparticle crosslinker colloidosome.

Colloidal capsules (or colloidosomes) have been studied for various applications such as therapeutic agent encapsulation, photothermal therapy, imaging, and energy storage. Emulsion-based synthesis is the most common approach for preparing colloidal capsules as it is relatively straightforward and scalable. However, while the initial formation requires only introducing the colloidal subunits into an emulsion and letting them assemble at the interface, a second step is required in order to prepare stable, covalently linked colloidal capsules, and preparing submicron colloidal capsules is quite challenging. Here, we describe a simple and quick one-step method to synthesize covalently linked, stable nanoscale colloidal capsules consisting of gold nanoparticles (NPs) (AuNP) and thiol-containing cross-linkers. Gold nanoparticle capsules (AuNCs) were formed by coating emulsion droplets containing thiol-containing cross-linkers with citrate-stabilized AuNPs. The physicochem. properties of the colloidal capsules can be tailored by changing the building blocks. In order to demonstrate this, colloidal capsules were assembled from AuNPs ranging from 5 to 20 nm in size. The use of the larger 20 nm starting particles resulted in AuNCs with a sufficiently pronounced red shift for λmax to be suitable for biol. photothermal applications, where use of a near-IR laser is strongly preferred. The AuNCs were found to be biocompatible and stable in cell culture conditions and to provide moderate heating. This demonstrates the modularity of the synthesis and the potential advantages of a one-step synthesis to prepare nanoscale gold colloidal capsules.

Langmuir published new progress about Aggregates. 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

Guzman, Dailyn published the artcileFully renewable thermosets based on bis-eugenol prepared by thiol-click chemistry, SDS of cas: 7575-23-7, the main research area is fully renewable thermoset bis eugenol thiol click chem.

Thiol-ene photocuring and thiol-epoxy thermal curing have been applied to prepare new thermosets from renewable substrates. As monomers, a tetrallyl and a tetraepoxy derivative of bis-eugenol were prepared by dimerization of eugenol, allylation and further epoxidation These compounds were reacted with a com. available tetrathiol, PETMP, and thiols synthesized from two natural resources as squalene (6SH-SQ) and eugenol (3SH-EU) in photoinitiated and thermal conditions. The reaction process was studied by calorimetry, and the materials obtained were characterized by thermogravimetry, thermomech. studies and mech. testing. Thiol-epoxy materials showed a better mech. performance than thiol-ene photocured thermosets. This new epoxy monomer of renewable origin allowed to prepare materials with final properties better than those obtained from the diglycidylether of bisphenol A, owing to the high functionality of bis-eugenol and its rigid and compact structure.

Reactive & Functional Polymers published new progress about Allylation. 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

Coste, Guilhem published the artcileNon-isocyanate polyurethane foams based on six-membered cyclic carbonates, Quality Control of 7575-23-7, the main research area is nonisocyanate polyurethane foam membered cyclic carbonate.

Polyurethane foams currently dominate the global foam market. Nevertheless, the main drawback of these foams remains the use of toxic isocyanate reagents. To overcome this issue, several ways have been explored. The most promising route appears to be the aminolysis of 5-membered cyclic carbonates leading to formation of polyhydroxyurethanes (PHUs). However, the lack of reactivity of systems using C5-cyclic carbonates currently limits the application range of PHUs. Hence, this study reports the first synthesis of PHUs foams using a new tetrafunctional 6-membered cyclic carbonate (TC6). The TC6 was reacted with different diamines under catalyst-free and mild temperature conditions in presence of a chem. blowing agent. Three different amines were employed, allowing access to various foams properties. Finally, promising flexible foams have been obtained, with interesting properties that could make them possible new candidates for applications as seating or insulation mattresses.

European Polymer Journal published new progress about Aminolysis. 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

Barnes, Morgan published the artcileDirect shape programming of liquid crystal elastomers, Quality Control of 7575-23-7, the main research area is liquid crystal elastomer shape programming.

Liquid crystal elastomers (LCEs) are shape morphing materials promising for many applications including soft robotics, actuators, and biomedical devices, but current LCE synthesis techniques lack a simple method to program new and arbitrary shape changes. Here, we demonstrate a straightforward method to directly program complex, reversible, non-planar shape changes in nematic LCEs. We utilize a double network synthesis process that results in a competitive double network LCE. By optimizing the crosslink densities of the first and second network we can mech. program non-planar shapes with strains between 4-100%. This enables us to directly program LCEs using mech. deformations that impart low or high strains in the LCE including stamping, curling, stretching and embossing methods. The resulting LCEs reversibly shape-shift between the initial and programed shape. This work widens the potential application of LCEs in biomedical devices, soft-robotics and micro-fluidics where arbitrary and easily programed shapes are needed.

Soft Matter published new progress about Anisotropy. 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

Hoeglund, Martin published the artcileFacile Processing of Transparent Wood Nanocomposites with Structural Color from Plasmonic Nanoparticles, SDS of cas: 7575-23-7, the main research area is facile processing transparent wood nanocomposite structural color plasmonic nanoparticle.

Wood is an eco-friendly and abundant substrate and a candidate for functionalization by large-scale nanotechnologies. Infiltration of nanoparticles into wood, however, is hampered by the hierarchically structured and interconnected fibers in wood. In this work, delignified wood is impregnated with gold and silver salts, which are reduced in situ to plasmonic nanoparticles via microwave-assisted synthesis. Transparent biocomposites are produced from nanoparticle-containing wood in the form of load-bearing materials with structural color. The coloration stems from nanoparticle surface plasmons, which require low size dispersity and particle separation Delignified wood functions as a green reducing agent and a reinforcing scaffold to which the nanoparticles attach, predesigning their distribution on the surface of fibrous “”tubes””. The nanoscale structure is investigated using scanning transmission electron microscopy (STEM), energy-dispersive spectroscopy (EDS), and Raman microscopy to determine particle size, particle distribution, and structure-property relationships. Optical properties, including response to polarized light, are of particular interest.

Chemistry of Materials published new progress about Balsa wood. 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