Tag: M.W=400-500

Russo, Claudio published the artcileRheological and mechanical characterization of dual-curing thiol-acrylate-epoxy thermosets for advanced applications, Synthetic Route of 7575-23-7, the main research area is epoxy thiol acrylate dual curing rheol mech property; acrylate; adhesive; dual-curing; epoxy; shape-memory polymer; thiol.

Mech. and rheol. properties of novel dual-curing system based on sequential thiol-acrylate and thiol-epoxy reactions are studied with the aim of addressing the obtained materials to suitable advanced applications. The crosslinking process is studied by rheol. anal. in order to determine conversion at gelation and the critical ratio. These parameters are used to discuss the intermediate material structure for each acrylate proportion and their possible application in the context of dual-curing and multi-step processing scenarios. Results from dynamo-mech. anal. and mech. testing demonstrate the high versatility materials under investigation and revealed a wide range of achievable final properties by simply varying the proportion between acrylate and thiol group. The intermediate stability between curing stages has been analyzed in terms of their thermal and mech. properties, showing that these materials can be stored at different temperatures for a relevant amount of time without experiencing significant effects on the processability. Exptl. tests were made to visually demonstrate the versatility of these materials. Qual. tests on the obtained materials confirm the possibility of obtaining complex shaped samples and highlight interesting shape-memory and adhesive properties.

Polymers (Basel, Switzerland) published new progress about Adhesive bonding. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Synthetic Route of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Wang, Wu published the artcileTwo-stage reactive shape memory thiol-epoxy-acrylate system and application in 3D structure design, Quality Control of 7575-23-7, the main research area is shape memory thiol epoxy acrylate system photocuring; dynamic mech property.

Shape memory polymers (SMPs) are widely applied in actuator, aerospace, and super wetting. Besides, the specific structures of SMPs are important to achieve such performance. However, the preparation process of specific structure of SMPs to achieve certain performance are always time-consuming and costly for the high crosslinking d. exists in the resin matrix. Fortunately, two-stage reactive SMPs system can be used to prepare complex structure for the function of precise material design. To attain this goal and explore new application of SMPs, we designed a novel two-stage reactive shape memory polymer (SMP) system based on non-stoichiometric thiol, epoxy, and acrylate. In this novel system, intermediate polymer with shape memory performance can be prepared in the first thermal curing stage. With the shape memory property, the intermediate polymer can be designed to a certain structure. Then, final polymer with stable and complex shape can be further fabricated after the photo-curing in the second stage. Therefore, this novel two-stage reactive SMP system shows promising applications in 3D structure manufacturing, mold-free fabrication, and spatio-selective materials.

Advanced Composites and Hybrid Materials published new progress about Complex modulus, tan δ. 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

Wang, Xingguo published the artcileHighly selective membrane for efficient separation of environmental determinands: Enhanced molecular imprinting in polydopamine-embedded porous sleeve, SDS of cas: 7575-23-7, the main research area is polydopamine embedded molecularly imprinted membrane selective separation environmental.

The molecularly imprinted membrane has shown irreplaceable superiority in advanced water treatment, biochem. purification, and in most cases, pretreatment of environmental determinands. However, effective and controllable construction of imprinted sites in membrane-based interpenetrating pores is as yet the significant bottleneck. Herein, the authors proposed a thermally induced strategy on the polydopamine-embedded molecularly imprinted membrane (DEMIM) for enhanced selective separation of Ciprofloxacin (CIP). The porous sleeve was constructed with polyvinylidene fluoride (PVDF), together with the integrated β-cyclodextrin (β-CD) for hydrophilicity and anti-fouling requirements. Based on the thermally induced operation, polydopamine (PDA) embedded in the membrane matrix acted as a secondary reaction platform, effectively improving the interpenetrating-bicontinuous porous morphol. and enhancing the availability of imprinted sites in microchannels. The imprinting polymerization was carried out by the efficient thiol-ene click reaction, which was investigated in depth by d. functional theory (DFT) calculations The impressive relative separation factor (2.33-4.59) and permselectivity (9.50-12.50) indicated the superior availability of DEMIM for the selective separation The remarkable regeneration performance (fluctuation in 8.4%∼10.8%) demonstrated the feasibility of the porous membrane-based sleeve for regeneration of mol. imprinting. The approach and methodologies achieved in this work will potentially promote the development of novel molecularly imprinted membranes for advanced applications.

Chemical Engineering Journal (Amsterdam, Netherlands) published new progress about Density functional theory. 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

Aksakal, Suzan published the artcileTransformation of Thioester-Initiated Star Polymers into Linear Arms via Native Chemical Ligation, Application In Synthesis of 7575-23-7, the main research area is thioester initiated linear arm star polymer native chem ligation; copper-mediated polymerization; native chemical ligation; star polymers; thioester initiators.

The synthesis of a new class of Cu-mediated polymerization initiators with thioester functionality is demonstrated and their polymerization kinetics via single-electron transfer living radical polymerization is reported. From periodic sampling, it is found that thioester- or ester-based initiators can be employed interchangeably, resulting in very similar polymerization rates. Furthermore, a multifunctional thioester initiator is employed for the preparation of a well-defined four-arm star-shaped polymer. It is further shown that the full dissociation of the star polymer into linear arms via native chem. ligation can easily be followed via size exclusion chromatog., as a result of the change in hydrodynamic volume Finally, the obtained linear polymers are characterized via matrix-assisted laser desorption/ionization-time of flight mass spectrometry and found to be in good agreement with the expected mol. weight distribution that confirms the successful transformation.

Macromolecular Rapid Communications published new progress about Hydrodynamic radius. 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

Mistry, D. published the artcileSoft elasticity optimizes dissipation in 3D-printed liquid crystal elastomers, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is liquid crystal elastomer 3D printing soft elasticity.

Soft-elasticity in monodomain liquid crystal elastomers (LCEs) is promising for impact-absorbing applications where strain energy is ideally absorbed at constant stress. Conventionally, compressive and impact studies on LCEs have not been performed given the notorious difficulty synthesizing sufficiently large monodomain devices. Here, we use direct-ink writing 3D printing to fabricate bulk (>cm3) monodomain LCE devices and study their compressive soft-elasticity over 8 decades of strain rate. At quasi-static rates, the monodomain soft-elastic LCE dissipated 45% of strain energy while comparator materials dissipated less than 20%. At strain rates up to 3000 s-1, our soft-elastic monodomain LCE consistently performed closest to an ideal-impact absorber. Drop testing reveals soft-elasticity as a likely mechanism for effectively reducing the severity of impacts – with soft elastic LCEs offering a Gadd Severity Index 40% lower than a comparable isotropic elastomer. Lastly, we demonstrate tailoring deformation and buckling behavior in monodomain LCEs via the printed director orientation.

Nature Communications published new progress about Anisotropic materials. 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

Martin Linares, Cristina P. published the artcileThe effect of alignment on the rate-dependent behavior of a main-chain liquid crystal elastomer, Formula: C17H28O8S4, the main research area is thiol acrylate liquid crystal elastomer mech property.

This study investigated the effect of alignment on the rate-dependent behavior of a main-chain liquid crystal elastomer (LCE). Polydomain nematic LCE networks were synthesized from a thiol-acrylate Michael addition reaction in the isotropic state. The polydomain networks were stretched to different strain levels to induce alignment then crosslinked in a second stage photopolymerization process. The LCE networks were subjected to dynamic mech. tests to measure the temperature-dependent storage modulus and uniaxial tension load-unload tests to measure the rate-dependence of the Young’s modulus, mech. dissipation, and characteristics of the soft stress response. Three-dimensional (3D) digital image correlation (DIC) was used to characterize the effect of domain/mesogen relaxation on the strain fields. All LCE networks exhibited a highly rate-dependent stress response with significant inelastic strains after unloading. The Young’s modulus of the loading curve and hysteresis of the load-unload curves showed a power-law dependence on the strain rate. The Young’s modulus increased with alignment and larger anisotropy and a smaller power-law exponent was measured for the Young’s modulus and hysteresis for the highly aligned monodomains. The polydomain and pre-stretched networks loaded perpendicular to the alignment direction exhibited a soft stress response that featured a rate-dependent peak stress, strain-softening, and strain-stiffening. The 3D-DIC strain fields for the polydomain network and programmed networks stretched in the perpendicular direction were highly heterogeneous, showing regions of alternating higher and lower strains. The strain variations increased initially with loading, peaked during the strain softening part of the stress response, then decreased during the strain stiffening part of the stress response. Greater variability was measured for lower strain rates. These observations suggest that local domain/mesogen relaxation led to the development of the heterogeneous strain patterns and strain softening in stress response. These findings improved understanding of the kinetics of mesogen relaxation and its contributions to the rate-dependent stress response and mech. dissipation.

Soft Matter published new progress about Complex modulus, tan δ. 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

Boothby, Jennifer M. published the artcileEffects of network structure on the mechanical and thermal responses of liquid crystal elastomers, Synthetic Route of 7575-23-7, the main research area is liquid crystal elastomer mech thermal property mol dynamics simulation.

Thermoresponsive liquid crystal elastomers (LCEs) have a high potential to be used for actuation applications. There has been a substantial amount of literature on synthesis of different LCE networks and their corresponding performance. However, much of the prior work focuses on the exptl. aspect of the effects of mesogenic species, crosslinkers, and spacers on the thermal and mech. response of LCE. Here we have built on these prior studies, and expanded understanding of LCE work capacity and thermal properties to the mol. and network structures by comparing the exptl. results to the theor. predicted values based on a random walk model derived from classical rubber elasticity. A previously developed two stage thiol-acrylate LCE chem. was used as the model system. On the basis of increasing the chain entropy, we varied crosslinker concentration, crosslinker functionality, and liquid crystal mesogen length and showed that average mol. weight between crosslinks and mol. weight of the Kuhn segment play important roles in controlling the work capacity. The rubber elastic model predicted network performance agreed reasonably well with the exptl. results.

Multifunctional Materials 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, Synthetic Route of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Allegrezza, Michael L. published the artcileEfficient coupling by oxygen accelerated photocatalyzed thiol-alkyne chemistry, HPLC of Formula: 7575-23-7, the main research area is coupling oxygen accelerated photocatalyzed thiol alkyne chem.

Thiol reactions have gained attention in many areas of chem. research, such as organic small mol. synthesis, polymer synthesis, and bimol. coupling due to the “”click”” chem. characteristics of this process. This work is a study of a novel method of photochem. thiol-alkyne reactions using alkyl halides and an Ir(ppy)3 photocatalyst. This process is shown to lead to rapid reactions and has the benefit of low catalyst and initiator concentrations relative to reagents. Remarkably, this reaction also has an unusual feature of an increased rate in the presence of oxygen, in contrast to many other types of radical processes. Catalyst and initiator concentrations and reaction conditions are varied in order to gain an understanding of the mechanism of this process. This chem. is then applied to the synthesis of hyperbranched polymers and polymer networks to demonstrate potential applications.

Polymer published new progress about Fluorescence. 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

Zhang, Chi published the artcileLithium Salt-Induced In Situ Polymerizations Enable Double Network Polymer Electrolytes, Quality Control of 7575-23-7, the main research area is lithium salt induced polymer electrolytes radical polymerization battery; double networks; in situ polymerization; lithium-ion batteries; polymer electrolytes.

Structural design is an intriguing strategy to improve the phys. and electrochem. performance of polymer electrolytes (PEs) for lithium-ion batteries. However, the complex synthetic process and introduction of nonelectrolyte composition severely limit the development and practical application of PEs. Here, a facile method is reported for the fabrication of a double network polymer electrolyte (DN-PE) through combining the lithium salt-accelerated thiol-Michael addition and lithium salt-catalyzed radical polymerization By adjusting the reaction temperature, the double network with the crosslinking structure can be in situ formed step by step at room temperature and 80°C. Notably, using lithium salt as the accelerator and catalyst avoids the addition of extra species and the related side reactions in the electrolyte system. Compared with single network polymer electrolyte (SN-PE), DN-PE has a distinctly improved mech. strength and a better interfacial compatibility with the electrode, which leads to a stable cycling of the sym. Li|DN-PE|Li cell over 1000 h at a c.d. of 0.05 mA cm-2. In addition, the Li|DN-PE|LiFePO4 cell shows a high discharge specific capacity of 150.3 mAh g-1 at 0.1 C and coulomb efficiency of 99%.

Macromolecular Rapid Communications published new progress about Battery capacity. 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

Ghahremani, Pantea published the artcileCerium containing pH-responsive microcapsule for smart coating application: Characterization and corrosion study, Formula: C17H28O8S4, the main research area is cerium nitrate melamine formaldehyde microcapsule epoxy coating pH corrosion.

In the following paper first, novel pH-sensitive melamine-formaldehyde microcapsules containing ethylene glycol with three concentrations of cerium nitrate were synthesized. Then, three different quantities of the microcapsules were introduced to the epoxy coatings and applied on the AA2024-T3 substrate to meet the increasing demands for self-healing coatings. The characteristics of microcapsules were studied by scanning electron microscope, transmission electron microscope, Fourier transform IR, and dynamic light scattering. The UV-Vis spectroscopy was accomplished to the appraise pH-triggered release of the microcapsules. The salt spray test along with electrochem. impedance spectroscopy was conducted for studying the anti-corrosion and self-healing proficiency of microcapsule-based coatings. The UV-Vis spectroscopy outcomes showed that the synthesized microcapsules are responsive to alk. pH and the release rate of microcapsules in the basic medium rises with increasing the pH values. Moreover, the EIS and salt spray results indicated that incorporation of 10 wt% of the microcapsules into the epoxy coating not only improved the anti-corrosion strength of the aluminum substrate compared to neat epoxy coating remarkably but also, provided active corrosion protection of the substrate through the self-healing action of cerium ions. Also, the attendance of cerium cations in the scratch surface was confirmed by field emission SEM and energy-dispersive X-ray map.

Surface and Coatings Technology published new progress about Anticorrosive coating materials. 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