Tag: M.W=400-500

Amato, Dahlia N. published the artcileProgrammable Porous Polymers via Direct Bubble Writing with Surfactant-Free Inks, Product Details of C17H28O8S4, the main research area is porous polymer direct bubble writing ink macroporous thiol ene; 3D printing; functionally graded materials; nonaqueous foam; polymer foams; thiol−ene.

Fabrication of macroporous polymers with functionally graded architecture or chem. bears transformative potential in acoustic damping, energy storage materials, flexible electronics, and filtration but is hardly reachable with current processes. Here, we introduce thiol-ene chemistries in direct bubble writing, a recent technique for additive manufacturing of foams with locally controlled cell size, d., and macroscopic shape. Surfactant-free and solvent-free graded three-dimensional (3D) foams without drying-induced shrinkage were fabricated by direct bubble writing at an unparalleled ink viscosity of 410 cP (40 times higher than previous formulations). Functionalities including shape memory, high glass transition temperatures (>25°C), and chem. gradients were demonstrated. These results extend direct bubble writing from aqueous inks to nonaqueous formulations at high liquid flow rates (3 mL min-1). Altogether, direct bubble writing with thiol-ene inks promises rapid one-step fabrication of functional materials with locally controlled gradients in the chem., mech., and architectural domains.

ACS Applied Materials & Interfaces published new progress about Cell volume. 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

Ahn, Chihyung published the artcileBioinspired Design of Light-Powered Crawling, Squeezing, and Jumping Untethered Soft Robot, Quality Control of 7575-23-7, the main research area is light powered soft robot squeezing crawling jumping.

Light has been recently intensively explored to power robots. However, most existing light-driven robots have limited locomotion modalities, with constrained locomotion capabilities. A light-powered soft robot with a bioinspired design is demonstrated, which can crawl on ground, squeeze its way through a small channel, and jump over a barrier. The arch-shaped robot is made up of liquid crystal elastomer-carbon nanotube composite. When a light source with a power intensity of around 1.57 W cm-2 is scanned over the surface of the robot, it deforms and crawls forward. With an increase in the light scanning speed, it can deform sufficiently to pass through a channel 25% lower than its body height. Subjected to light irradiation, it can also deform to a closed loop, gradually store elastic energy, and suddenly release it to jump over a wall or onto a step quickly, with a jumping distance around eight times its body length and jumping height around five times its body height. Math. models for quant. understanding the multimodal locomotion of this light-powered soft robot are also presented.

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

Luan, Zhongyue published the artcileReversible Aggregation of Covalently Cross-Linked Gold Nanocrystals by Linker Oxidation, Quality Control of 7575-23-7, the main research area is gold nanocrystal aggregation thiol oxidation ligand.

Covalent crosslinking of colloidal gold nanocrystals (Au NCs) with dithiol mols. is normally considered to be an irreversible self-assembly process. Left unchecked, dithiol-mediated aggregation results in the uncontrolled formation of polymeric NC-dithiolate precipitates Here we demonstrate the reversible assembly and disassembly of dithiolate-linked precipitates and colloidal aggregates of Au NCs by oxidizing the dithiolate linkers with ozone. Destruction of the linkers results in the complete depolymerization of the NC aggregates/precipitates to re-form stable aqueous colloids of individual Au NCs with retention of the original NC size distribution. The process is repeatable by adding addnl. dithiol to reinitiate aggregation, although some irreversible fusion of the NCs occurs in subsequent cycles. This method for reversible self-assembly of covalently cross-linked Au NCs is simple, clean, reproducible, and effective for a variety of linkers. Extending reversibility to covalently bound NC assemblies creates new possibilities in plasmonic sensing and catalysis.

Journal of Physical Chemistry C published new progress about Aggregation. 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

Xu, Huilong published the artcileRheology of end-linking polydimethylsiloxane networks filled with silica, Application In Synthesis of 7575-23-7, the main research area is rheol polydimethylsiloxane network filled silica.

Filled vulcanizates exhibit the nonlinear Payne effect under dynamic deformations at high strain amplitudes, while the underlining mechanisms are still in dispute. Herein, polydimethylsiloxane (PDMS) networks are prepared via end-linking of α,ω-vinyl-terminated PDMS chains by the thiol-ene reaction, and the influences of silica on the dynamic rheol. responses are investigated. The presence of silica tends to improve the crosslinking d. alongside reinforcing the network, while silica itself does not contribute to the loss factor markedly. Furthermore, silica could promote the onset strain amplitude of the Payne effect and manifest the very weak overshoot of loss modulus near the onset amplitude. By creating master curves of the Payne effect of the filled vulcanizates referenced to the end-linking networks, it is evidenced that this effect and the accompanied weak overshoot are mainly rooted in the nonlinear Rouse dynamics of the network strands. (c) 2020 American Institute of Physics.

Journal of Rheology (Melville, NY, United States) published new progress about Aggregation. 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

Koo, Jahyeon published the artcilePolarized Light Emission from Uniaxially Oriented and Polymer-Stabilized AIE Luminogen Thin Films, Application of Pentaerythritol tetra(3-mercaptopropionate), the main research area is polarized light emission uniaxially oriented polyogen dicyanodistyrylbenzene croslsinked; polymer luminogens aggregation emission.

Organic materials with linearly polarized luminescence (LPL) properties and good processability are critical to the development of advanced optical devices. To fabricate polymer-stabilized thin films with LPL properties, dicyanodistyrylbenzene-based reactive luminogens (abbreviated as DRL) containing both vinyl and thiol units were newly synthesized. On the basis of morphol. observations combined with thermal and scattering analyses, it was found that DRL has a nematic liquid crystal mesophase. DRL mols. were uniaxially oriented by surface alignment layer and stabilized by thiol-ene click reaction. Uniaxially oriented and polymer-stabilized DRL thin films showed excellent chem. resistance as well as mech. and thermal stability due to the chem. crosslinked polymer network. The DRL polymer film exhibited strong emission at 564 nm with remarkable LPL property. The polymer-stabilized films obtained from reactive luminogens with aggregation-induced enhanced emission (AIEE) properties have great potential for the application of advanced optical devices.

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

Allegrezza, Michael L. published the artcilePhotocatalyzed thiol-alkene coupling: Mechanistic study and polymer synthesis, Related Products of alcohols-buliding-blocks, the main research area is photocatalyst thiol alkene coupling polymer crosslinked.

Due to the “”click”” chem. characteristics of the thiol-ene reaction, these transformations have been gaining an increasing amount of attention in current chem. research. The high efficiency and selectivity of these transformations have been useful for many areas of study, from small mol. organic synthesis, to polymer synthesis and functionalization, to bio-conjugation reactions. In this work, a study of a novel method of photochem. thiol-ene reactions using alkyl halides and an tris[2-phenylpyridinato-C2,N]iridium(III) (Ir(ppy)3) photocatalyst is investigated. This process is shown to progress rapidly and has the benefit of low catalyst and initiator concentrations relative to reagents as well as mild conditions associated with photochem. processes. To understand the mechanism of this process, catalyst and initiator concentrations and other reaction conditions are varied. To demonstrate the utility of this process, a step-growth thiol-ene polymer is synthesized using dithiol and diene monomers and a crosslinked polymer network is synthesized as well. © 2019 Wiley Periodicals, Inc.J. Polym. Sci., Part A: Polym.Chem. 2019.

Journal of Polymer Science, Part A: Polymer Chemistry published new progress about Loss modulus. 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

Love, Dillon published the artcileReaction Environment Effect on the Kinetics of Radical Thiol-Ene Polymerizations in the Presence of Amines and Thiolate Anions, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is kinetics radical thiolene polymerization amine thiolate anion.

Because of facile implementation, quant. conversions, and an insensitivity to oxygen, water, and most organic functional groups, radical-mediated thiol-ene coupling (TEC) reactions have emerged as a valuable tool in macromol. synthesis. It was recently demonstrated that the kinetics and conversions of thiyl radical-mediated reactions are adversely affected in the presence of basic amines by the formation of retardive thiolate anions. Herein, the performance of TEC polymerizations is evaluated under a variety of reaction environments with the intention to aid in the optimal formulation design of TEC reactions in the presence of amines. Results from both bulk and aqueous-phase network photopolymerizations established that sensitivity to amine basicity and pH is dependent on the thiol acidity, although norbornene-type alkenes exhibit a unique ability to achieve high conversions, where allyl ethers, vinyl ether, and vinyl siloxanes are highly inhibited. Addnl., the protic solvents such as alcs. and acetic acid are established as ideal solvents or additives to suppress or eliminate amine-induced retardation.

ACS Macro Letters published new progress about Loss modulus. 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

Yang, Jeh-Chang published the artcileTensile Stress Generation on Crystallization of Polymer Networks, HPLC of Formula: 7575-23-7, the main research area is tensile stress crystallization polymer network.

When crystallized under constant strain, conventional semicrystalline networks exhibit a loss in tension due to directionally preferred crystallization of chains along the strain axis. This study shows that a dual-cured, semicrystalline polymer network with programmed chain bias can generate �00 kPa of tensile stress upon crystallization Constant strain experiments were conducted to monitor stress in configurationally biased networks as they were cooled and crystallized Time resolved wide-angle X-ray scattering was used to study crystallization kinetics and the evolution of crystallite orientation. In configurationally biased networks without external load, initial crystallization along the internal chain bias direction is rapidly followed by crystal growth in the orthogonal direction. Under external loads, crystallization first occurs along the external load direction followed by the configurational chain bias direction. Calorimetry measurements indicate that two distinct crystal populations form upon cooling with different crystallization temperatures In summary, embedding chain bias can act as a source of tension. The magnitude of tensile stress can be controlled though different crystallization temperatures These findings open up new opportunities for engineering of thermoresponsive networks in applications where stress must be retained or generated upon crystallization

ACS Applied Polymer Materials published new progress about Crosslinking. 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

Saed, Mohand O. published the artcileDynamic Semicrystalline Networks of Polypropylene with Thiol-Anhydride Exchangeable Crosslinks, Related Products of alcohols-buliding-blocks, the main research area is semicrystalline network polypropylene thiolanhydride exchangeable crosslink; 3D printing; plastic recycling; polypropylene; thermoplastic; thiol-anhydrate; thiol-thioester; vitrimer.

Thermoplastic polyolefins (TPOs) crosslinked by dynamic covalent bonds (xTPOs) have the potential to be the most utilized class of polymer in the world, with applications ranging from household and automotive to biomedical devices and additive manufacturing xTPO combines the benefits of thermoplastics and thermosets in a “”single material”” and potentially avoids their shortcomings. Here, we describe a new two-stage reaction extrusion strategy of TPOs with a backbone consisting of inert C-C bonds (polypropylene, PP), and thiol-anhydride, to dynamically crosslink PP through thiol-thioester bond exchange. The degree of PP crosslinking determines the rubber plateau modulus above the m.p. of the plastic: the modulus at 200°C increases from zero in the melt to 23 kPa at 6% crosslinking, to 60 kPa at 20%, to 105 kPa at 40%. The overall mech. strength of the solid xTPO plastic is 25% higher compared to the original PP, and the gel fraction of xTPO reaches 55%. Finally, we demonstrate that the crosslinked xTPO material is readily reprocessable (recycled, remolded, rewelded, and 3D printed).

ACS Applied Materials & Interfaces published new progress about Crosslinking. 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

Miao, Wusha published the artcileStructural tuning of polycaprolactone based thermadapt shape memory polymer, Formula: C17H28O8S4, the main research area is polycaprolactone thermadapt shape memory polymer thermal treatment.

Dynamic covalent chem. has reshaped our understanding of chem. crosslinked polymer networks, with broad implications on self-healing, reprocessable, and reconfigurable functional networks. Amongst them, transesterification based polycaprolactone (PCL) networks represent prototypical thermadapt shape memory polymers with unique permanent shape reconfigurability. Despite several studies on this system, structural factors that impact the solid-state plasticity behind the shape reconfigurability are poorly understood. In this work, PCL networks with precisely tunable crosslinking d. and hydroxyl content were synthesized using a thiol-ene click reaction. This allows independent evaluation on how these two critical structural parameters determine the network rearrangement kinetics. In particular, we clarify an ambiguity on the role of the hydroxyl groups in such networks. This study leads to PCL based thermadapt shape memory polymers with tunable performance. On a broader basis, it also offers useful guidelines in designing transesterification based dynamic networks.

Polymer Chemistry published new progress about Crosslinking. 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