Tag: M.W=400-500

Shivaraja, S. J. published the artcileFaster switching polymer dispersed liquid crystal devices incorporated with functionalized SWCNTs, Category: alcohols-buliding-blocks, the main research area is carbon nanotube polymer dispersed liquid crystal electrooptical property.

Polymer dispersed liquid crystals (PDLCs) were fabricated using acrylate-based UV curable monomer and a low birefringent nematic liquid crystal, 5PCH, by polymerization induced phase separation method. The effect of ODA-SWCNT dispersion on electro-optical properties of PDLC was investigated and compared with the undoped PDLC. The total response time reduces by 70%, and threshold voltage decreases by 42% in PDLC prepared with 0.015 wt% ODA-SWCNT nanocomposites of 5PCH, compared to the PDLC prepared with pure 5PCH. The optical transparency and sharpness of the image in ON-state was found to be remarkably better in the ODA-SWCNT incorporated PDLC as compared to the PDLC prepared with pure 5PCH.

Journal of Molecular Liquids published new progress about Birefringence. 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

Martinez, Alina M. published the artcilePermanent and reversibly programmable shapes in liquid crystal elastomer microparticles capable of shape switching, Computed Properties of 7575-23-7, the main research area is liquid crystal elastomer microparticle thiol Michael dispersion polymerization.

Reversibly programmable liquid crystal elastomer microparticles (LCEMPs), formed as a covalent adaptable network (CAN), with an average diameter of 7μm ± 2μm, were synthesized via a thiol-Michael dispersion polymerization The particles were programmed to a prolate shape via a photoinitiated addition-fragmentation chain-transfer (AFT) exchange reaction by activating the AFT after undergoing compression. Due to the thermotropic nature of the AFT-LCEMPs, shape switching was driven by heating the particles above their nematic-isotropic phase transition temperature (TNI). The programmed particles subsequently displayed cyclable two-way shape switching from prolate to spherical when at low or high temperatures, resp. Furthermore, the shape programming is reversible, and a second programming step was done to erase the prolate shape by initiating AFT at high temperature while the particles were in their spherical shape. Upon cooling, the particles remained spherical until addnl. programming steps were taken. Particles were also programmed to maintain a permanent oblate shape. Addnl., the particle surface was programmed with a diffraction grating, demonstrating programmable complex surface topog. via AFT activation.

Soft Matter published new progress about Birefringence. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Computed Properties of 7575-23-7.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Li, Ying published the artcileMicroscopic ordered structure compactness and intrinsic thermal conductivity improvement of dispersed liquid crystal films of flexible epoxy-thiol polymers, Synthetic Route of 7575-23-7, the main research area is epoxy thiol flexible polymer liquid crystal film dispersibility; thermal mech property.

Flexible epoxy-thiol polymers were fabricated by the reaction between N,N-diglycidyl-4-glycidyloxyaniline (NDGA), poly(propylene glycol)diglycidyl ether (PGDE) and thiol curing agent with different functionality including 3,6-dioxa-1,8-octanedithiol (DET), pentaerythritol tetra(3-mercaptopropionate) (PETMP) and trimethylolpropane tris(3-mercaptopropionate) (TTMP). Liquid crystal monomer (LCM) was uniformly dispersed into epoxy-thiol polymers to prepare dispersed liquid crystal films of flexible epoxy-thiol polymers (E-PDLC films). The elongation at break and tensile strength of E-PDLC films increased to 195.9% and 25 MPa resp. LCM showed favorable dispersibility and maintain ordered orientation of liquid crystal in E-PDLC films. The degree of order in mol. chain of epoxy-thiol polymers was increased, and chain interaction of epoxy-thiol polymers and LCM was enhanced by hydrogen-bonding. In E-PDLC films, with different thiol curing agent and LCM addition, different microscopic-ordered structure formed: ordered-layered structures and denser squamous ordered structures. Both of these two microscopic-ordered structures formed by different thiol curing agent and the addition of LCM, and afforded continuous phonon transfer paths. The thermal conductivity of E-PDLC films is up to 0.70 W m-1 K-1. This work offered a new way to design flexible epoxy resin and intrinsic thermal conductive polymers.

Materials Today Communications published new progress about Birefringence. 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, Yunpeng published the artcileLiquid Crystal Elastomer Twist Fibers toward Rotating Microengines, HPLC of Formula: 7575-23-7, the main research area is liquid crystal elastomer twist fiber preparation rotating microengine property; liquid crystal elastomers; rotating microengines; smart materials; stimuli-responsiveness; twist fibers.

Untethered twist fibers do not require end-anchoring structures to hold their twist orientation and offer simple designs and convenient operation. The reversible responsiveness of these fibers allows them to generate torque and rotational deformation continuously upon the application of external stimuli. The fibers therefore have potential in rotating microengines. In practical applications, high torque and rotational deformation are desirable to meet work capacity requirements. However, the simultaneous endowment of reversible responsiveness and high rotational performance to untethered twist fibers remains a challenge. In this study, a liquid crystal elastomer twist fiber (LCETF) is designed and developed with a fixed twisting alignment of mesogens to provide untethered and reversible responsiveness. Outstanding rotational performance can be achieved when the mesogenic orientation is disrupted through heat triggering. Owing to the significant intrinsic contractile ratio of the LCE material, the rotational deformation of the LCETF can reach 243.6° mm-1. More importantly, the specific torque can reach 10.1 N m kg-1, which exceeds previously reported values. In addition, the LCETF can be exploited in a rotating microengine to convert heat into electricity with an induction voltage as high as 9.4 V. This work broadens the applications of LCEs for energy harvesters, micromachines, and soft robots.

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

Azman, Muhammad Imran published the artcileFabrication of poly(pentaerythritol tetrakis (3-mercaptopropionate)/dipentaerythritol penta-/hexa-acrylate)HIPEs macroporous scaffold with alpha hydroxyapatite via photopolymerization for fibroblast regeneration, HPLC of Formula: 7575-23-7, the main research area is polyHIPE macroporosity scaffold hydroxyapatite photopolymerization fibroblast regeneration.

Synthetic biomaterials that can be structured into porous scaffolds for support cell growth have played a role in developing the field of tissue engineering. This research focused on combination of biodegradable emulsion template along with the assisting of low-cost polymerization reaction. The appendage of ester-based surfactant, Hypermer B246, played a vital role which gave an outstanding dispersion in HIPEs system and degradability. PolyHIPEs were prepared by using domestic UV light source for producing a multiscale porosity material. The morphol. showed a promising result of poly(pentaerythritol tetrakis (3-mercaptopropionate)/dipentaerythritol penta-/hexa-acrylate)HIPEs with varied Hypermer B246 surfactant concentration resulting in the pores size increased in between 51.2 ± 9.8μm to 131.4 ± 26.32μm. Cellular moieties of poly(TT/DPEHA) HIPEs were confirmed by using SEM while inclusion of hydroxyapatite were confirmed by SEM, FTIR and EDX-SEM and quantified by thermogravimetric anal. The maximum stress and compressive modulus of the obtained materials were significantly enhanced with HA up to five percent by weight Poly(TT/DPEHA)HIPEs with HA showed the ability for the cell attachment and the adhesion/proliferation of the cells, suggested that poly(TT/DPEHA) HIPEs with HA were suitable for biomaterial application.

Crystals published new progress about Cell adhesion. 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

Ma, Stephen J. published the artcileSurface Chemical Functionalization of Wrinkled Thiol-Ene Elastomers for Promoting Cellular Alignment, Quality Control of 7575-23-7, the main research area is cell adhesion polymer; Thiol–ene; cell alignment; cell-matrix interactions; controlled cell culture; mesenchymal stem cells; photopatterning; photopolymerization; substrate wrinkling.

Wrinkled polymer surfaces find broad applicability; however, the polymer substrates are often limited to poly(dimethylsiloxane) (PDMS), which limits spatial control over wrinkle features and surface chem. An approach to surface functionalization of wrinkled elastomer substrates is demonstrated through versatile, multistep thiol-ene click chem. The elastomer is formed using a thiol-Michael reaction of tetrathiol with excess diacrylates while wrinkle formation is induced through a second free radical UV polymerization of the acrylates on the surface of the elastomer. Due to oxygen inhibition of the free radical polymerization, pendant acrylates at the surface remain unreacted and are subsequently functionalized with a multifunctional thiol, which can be further reacted through a number of thiol-X “”click”” reactions. As a demonstration, these thiol surfaces are further modified to either promote cell adhesion of human mesenchymal stem cells (hMSCs) through coupling with RGDS-containing peptides or surface passivation through reaction with hydrophilic hydroxyl Et acrylate moieties. Through engineering both surface chem. and surface topog., hMSCs exhibited increased spreading and cell d. on RGDS-functionalized surfaces and a 2-fold increase in cell alignment when cultured on wrinkled substrates. Gradient-functionalized surfaces created by tuning the wrinkle wavelength with UV irradiation enabled rapid screening of the effect of topog. on the hMSCs. Further, this application of click chem. enables simultaneous tuning of wrinkle topol. and surface chem. toward targeted material applications.

ACS Applied Bio Materials published new progress about Cell adhesion. 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

Hoang, Stephane published the artcileMicrofluidic Assisted Flash Precipitation of Photocrosslinkable Fluorescent Organic Nanoparticles for Fine Size Tuning and Enhanced Photoinduced Processes, SDS of cas: 7575-23-7, the main research area is microfluidic assisted flash precipitation photocrosslinkable fluorescent organic nanoparticle; fluorescent organic nanoparticles; microfluidics; photochemistry; photophysics; size and control modulation.

Highly concentrated dispersions of fluorescent organic nanoparticles (FONs), broadly used for optical tracking, bioimaging and drug delivery monitoring, are obtained using a newly designed micromixer chamber involving high impacting flows. Fine size tuning and narrow size distributions are easily obtained by varying independently the flow rates of the injected fluids and the concentration of the dye stock solution The flash nanopptn. process employed herein is successfully applied to the fabrication of bicomposite FONs designed to allow energy transfer. Considerable enhancement of the emission signal of the energy acceptors is promoted and its origin is found to result from polarity rather than steric effects. Finally, we exploit the high spatial confinement encountered in FONs and their ability to encapsulate hydrophobic photosensitizers to induce photocrosslinking. An increase in the photocrosslinked FON stiffness is evidenced by measuring the elastic modulus at the nanoscale using at. force microscopy. These results pave the way toward the straightforward fabrication of multifunctional and mech. photoswitchable FONs, opening novel opportunities in sensing, multimodal imaging, and theranostics.

ChemPhysChem published new progress about Biocomposites. 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

Hoeglund, Martin published the artcileTransparent Wood Biocomposites by Fast UV-Curing for Reduced Light-Scattering through Wood/Thiol-ene Interface Design, Safety of Pentaerythritol tetra(3-mercaptopropionate), the main research area is transparent wood biocomposites fast UV Curing reduced Light Scattering; cellulose; debonding; haze; optical properties; polymer composite.

Transparent wood (TW) is an interesting polymer biocomposite with potential for buildings and photonics applications. TW materials need to be eco-friendly and readily processed with few defects, for high optical transmittance and low transmission scattering at wide angles (haze). Two wood templates with different lignin-content are impregnated with a new thiol-ene thermoset system. The more eco-friendly bleached wood template results in transparent wood with high optical transmission and much reduced transmission haze, due to strong reduction of interfacial air gaps. Characterization includes template composition, thiol-ene distribution, and polymerization in wood cell wall by EDX and confocal Raman microscopy, also NMR and DSC, tensile testing and FE-SEM fractog. for morphol. and wood/thiol-ene interface adhesion assessment. The wood template is a true nanocomposite with thiol-ene polymer located inside the nanoporous wood cell wall. Advanced TW applications require not only appropriate wood template modification and careful polymer matrix selection but also tailoring of the process to impregnation and polymerization mechanisms, in order to reduce optical defects.

ACS Applied Materials & Interfaces published new progress about Biocomposites. 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

Zhou, Le published the artcileEffect of functionality of thiol on the optical properties of liquid crystals/polymer composite films, HPLC of Formula: 7575-23-7, the main research area is liquid crystal polymer composite film thiol functionality optical property.

Optical diffusers with high transmission, high haze and excellent diffusing ability are widely needed in backlight unit (BLU) of liquid crystal displays (LCDs). However, there are still drawbacks in the particles-doped optical diffusers, including the distribution of the scattered particles due to agglomeration of particles and complex coating process. In this paper, polymer/liquid crystal composite films which are based on the epoxy resins, polyamine (PA) and varied thiol monomers were firstly prepared by thermally initiated polymerization The morphologies and optical properties of the composite films were systematically investigated. By controlling the functionality of thiol in the system of epoxy resins/thiol/PA/LCs, as the light scattering of anisotropic LCs and isotropic polymer framework is both achieved in the optical diffusers, good diffusing ability and high visible transmission (total transmission >96.0% and transmission haze >95.0%) are obtained.

Liquid Crystals published new progress about Agglomeration. 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

Lewandowska, Aneta published the artcileGel Polymer Electrolytes with Mixture of Triazolium Ionic Liquids and Propylene Carbonate, Application In Synthesis of 7575-23-7, the main research area is triazolium ionic liquid propylene carbonate gel polymer electrolyte; Kamlet–Taft parameters; gel polymer electrolytes; thiol–ene polymerization; triazolium ionic liquids.

This study is focused on the structural influence of 1,2,4-triazolium ionic liquid (IL), i.e., the effect of the length of the substituent and the type of substitution (1-methyl-4-alkyl or 1-alkyl-4-methyl) used in the mixture with propylene carbonate (PC) on the properties of thiol-ene polymer ionogels and on the preparation of an ionogel with satisfactory mech. and conductive properties. PC allows for higher conductivity but also causes electrolyte leakage from the gel. When using triazolium IL (instead of the imidazolium one), because of the stronger interactions between components of the system, the ionogels do not leak. In this study, 1,4-dialkyl-1,2,4-triazolium ILs were successfully synthesized by the alkylation of 1,2,4-triazole. Subsequently, gel polymer electrolytes were obtained by one-pot thiol-ene photopolymerization reactions of tetrafunctional thiols with different chem. structures: pentaerythritol tetra(3-mercaptopropionate) (PETMP) or pentaerythritol tetra(3-mercaptobutyrate) (PETMB) and trifunctional ene (TATT) in the presence of a mixture of 1,4-dialkyl-1,2,4-triazolium IL with PC. Measurements made by electrochem. impedance spectroscopy showed that all ionogels with TATT+PETMB as a polymer matrix presented smaller relative ionic conductivity compared to ionogels containing TATT+PETMP. The puncture resistance and elongation at puncture, measured by the puncture resistance method, were higher for ionogels with poly(TATT+PETMB) than for those with poly(TATT+PETMP). Moreover, ILs containing a Me group in position N1 of the 1,2,4-triazole ring presented lower puncture resistance than ionogels with ILs containing a Me group in position N4, especially for shorter alkyl chains. Addnl., the photo-differential scanning calorimetry method was employed to characterize the course of photopolymerization The compositions and their constituents were characterized by UV and IR spectroscopy.

Gels published new progress about Henry reaction. 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