Tag: M.W=400-500

Hennen, Daniel published the artcileExploiting the Carbon and Oxa Michael Addition Reaction for the Synthesis of Yne Monomers: Towards the Conversion of Acrylates to Biocompatible Building Blocks, SDS of cas: 7575-23-7, the main research area is alkyne monomer photopolymer michael addition reaction.

Herein, the authors demonstrated the synthesis of multifunctional alkyne building blocks from com. available acrylate monomers exploiting the carbon and oxa Michael addition reaction. These compounds were obtained in decent yields and show similar or even higher photoreactivity than the initial acrylates. Importantly, selected thiol-yne formulations can be processed by stereolithog. and significantly outperform the corresponding acrylate in terms of modulus and toughness. The high compatibility of such cured materials with osteosarcoma cells makes these photopolymers interesting for hard tissue engineering.

ChemPhotoChem published new progress about Adhesion, physical. 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

Yong, Ming Yee published the artcileNovel natural rubber-based epoxy coating, Quality Control of 7575-23-7, the main research area is natural rubber epoxy coating.

The use of renewable resources in development of polymeric products is becoming more relevant in the current times, braced by the scarcity of fossil resources and threat from global warming. The manuscript describes the preparation of epoxy resin from epoxidized natural rubber (ENR) via UV treatment, followed by investigation on the film properties of the coating produced by blending the natural rubber-based epoxy resin with pentaerythritol tetrakis(3-mercaptopropionate), PETMP as the hardener. The UV treatment involved is responsible to break down the natural rubber into smaller mol. weight fractions so that it becomes more compatible with common solvents and chems., and at the same time improves the solubility and viscosity of the resin. The results obtained are very encouraging, with significant reduction in the mol. weight of the rubber observed after 6 h of UV treatment, and spectroscopic characterization suggests that substantial amount of epoxide group in the ENR was effectively preserved during the treatment for subsequent reaction with PETMP. The epoxide group in the UV-degraded ENR was found to react with the -SH group of PETMP after the two were blended, applied into film, and heated at 80 °C. The properties of the coatings produced were investigated via pencil hardness test, crosshatch adhesion tape test, thermal stability test, water, and chem. resistance test. Most of the coating formulations produced film with excellent hardness, adhesion and chem. resistance. Coating B and C are among the best coating formulations, with both recorded pencil hardness grade ≥ 4H, zero film removal in the adhesion test, no film defect observed during saltwater, acid and alk. resistance test, and reasonably good thermal stability with onset of degradation above 200 °C.

Progress in Organic Coatings published new progress about Adhesion, physical. 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

Ohzono, Takuya published the artcileUnlocking Entropic Elasticity of Nematic Elastomers Through Light and Dynamic Adhesion, Computed Properties of 7575-23-7, the main research area is azobenzene nematic liquid crystal elastomer elasticity photoisomerization adhesion property.

Nematic liquid crystal elastomers (LCEs) generally show soft elasticity, masking entropic elasticity inherent in crosslinked networks. They macroscopically deform with little stress increase under straining because of the soft shear mode attained by nematic director rotations. Moreover, the nematic interaction in main-chain LCEs can arrest the ergodic response to cycling strain. It manifests hysteresis, slow relaxation, and increased viscosity, which critically affect their mech. applications such as actuation and adhesion. Here, it is shown that entropic elasticity fully recovers after photo-isomerization of azobenzene units incorporated in a nematic LCE. With the light-induced bent cis-isomers at room temperature, the degree of soft elasticity, viscosity, and adhesion are tangibly lowered. Mech. responses rationalize that cis isomers unlock the frozen configurational degree of freedom by reducing nematic order in the same manner observed upon temperature increase. The present results not only unveil how the nematic interaction suppresses entropic elasticity leading to the soft state, but also offer a guide to tuning viscoelasticity toward dynamic mech. applications.

Advanced Materials Interfaces published new progress about Adhesion, physical. 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

Addis, Clark C. published the artcilePreparation and characterization of a bio-based polymeric wood adhesive derived from linseed oil, Name: Pentaerythritol tetra(3-mercaptopropionate), the main research area is linseed oil polymeric wood adhesive mech property.

Increasing concerns over environmental health and safety, as well as diminishing fossil fuel reserves, motivate investigation into bio-based alternatives to petrochem.-derived adhesives. Adhesives derived from plant oils show promise as sustainable alternatives due to their abundance and low cost. Such adhesives are especially important in the growing domain of engineered lumber in which the material properties of low-value timber are enhanced using glued layers and joints. Linseed oil, which is derived from flax seeds, is a relatively unexplored feedstock for the preparation of eco-friendly wood adhesives. Herein, we report the preparation of a linseed oil-based adhesive and assess its strength on Liriodendron tulipifera (yellow poplar), Fraxinus americana (white ash) and Pseudotsuga menziesii (Douglas-fir). The results of a systematic study evaluating the influence of crosslinker choice, open-time, press time and adhesive spread rate on the shear strength of the adhesive-wood assembly are reported, as are results from water-soaking-and-drying tests that indicate excellent resistance of the linseed oil adhesive to water. Ultimately, these results show promise for use of the adhesive in timber applications.

International Journal of Adhesion and Adhesives published new progress about Adhesion, physical. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, Name: Pentaerythritol tetra(3-mercaptopropionate).

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Ruiz-Yi, Benjamin published the artcileResponse surface design of a thiol-ene polymer sealant to model adhesive strength, Quality Control of 7575-23-7, the main research area is thiol ene polymer sealant response surface design adhesive strength.

Com. aircraft fuel tanks require sealants applied at contact points to prevent leakage or moisture contamination, but cure times for conventional sealants range from hours to days. Thiol-ene UV curable sealants have been a proposed material for these applications. However, selecting proper monomers and optimizing synthesis conditions for a figure of merit is an arduous process. Therefore, modeling the adhesive strength of a thiol-ene sealant was performed using a response surface design of experiment (DoE). Two sep. crosslinking alkenes were sep. combined with a thiol monomer, and a 6 mm thick polymer was synthesized at different cure temperatures, cure times, and with various solid filler material on an aluminum substrate according to a response surface design. The samples were then peeled off the substrate at a 180° angle, and peel strength was measured. The DoE utilized the peel data to derive a multivariable numeric function for the peel strength. Resulting contour data shows the system has not been fully optimized, but trends in the data show that future experiments should lean toward higher cure times and temperatures to maximize peel strength. Addnl., the resulting model equation can predict adhesive strengths near the studied conditions.

Journal of Adhesion Science and Technology published new progress about Adhesion, physical. 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

Zhang, Li published the artcileEffects of the chain length of crosslinking agent and dye-doped amount on the electro-optical properties of polymer-dispersed liquid crystal films prepared by nucleophile-initiated thiol-ene click reaction, Safety of Pentaerythritol tetra(3-mercaptopropionate), the main research area is crosslinking dye doped electrooptical property polymer dispersed liquid crystal.

A series of crosslinking agents with different chain lengths were used to explore their effect on electro-optical properties of dye-doped polymer dispersed liquid crystals (PDLCs) film prepared by nucleophile-initiated thiol-ene click reaction. The influences of dye contents and temperatures on electro-optical properties were also investigated. It was found that the increase in chain length of crosslinking agent leads to the increase in driving voltage and the decrease in memory effect. The decrease in reaction temperature causes a decrease in driving voltage and an increase in transmittance. Particularly, the dye content could be optimized to obtain promising materials with min. driving voltage and high contrast ratio for display applications.

Liquid Crystals published new progress about Crosslinking agents. 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

Jego, Lucas published the artcileStudy of the Photocrosslinking of Ethylene Propylene Diene Monomer Terpolymer Under UV Irradiation, Quality Control of 7575-23-7, the main research area is ethylene propylene diene monomer terpolymer photocrosslinking UV Irradiation.

The photocrosslinking of thick samples of 5-ethylidene-2-norbornene-ethylene propylene diene monomer (ENB-EPDM) under air at room temperature was investigated. First, a model study was carried out on low-mol. weight oligomers: squalene, 1,2-polybutadiene, and 1,4-polybutadiene. Several crosslinking agents (meth(acrylics), bismaleimide, and thiol) combined with various photoinitiators were tested to improve the reactivity of these oligomers under UV irradiation Gel contents, crosslinking densities, viscosities, and viscoelastic properties were measured in order to characterize the extent of crosslinking. Acrylate-based crosslinking agents appeared to be the most reactive species and these results were then applied to a low-mol. weight EPDM. Several photoinitiators were tested and benzophenone turned out to be the most efficient photoinitiator when combined with trimethylolpropane triacrylate. Finally, a com. EPDM was subsequently photocrosslinked and high gel content and crosslinking d. were obtained after only 2 min of irradiation

Polymer Engineering & Science published new progress about Crosslinking agents. 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

Chen, Huan published the artcileFluorochromic polymeric elastomer film containing copper nanoclusters in response to multistimuli, Formula: C17H28O8S4, the main research area is fluorochromic acrylic elastomeric film copper nanocluster smart material.

Smart chromic elastomers exhibiting multistimuli responsiveness are of interest with regard to the development of sensors, optical data storage, and smart wearable devices. We report a new design of Cu nanoclusters (Cu NCs) containing polymeric elastomer film, showing reversible fluorescence ON/OFF when subjected to organic solvents (e.g. ethanol, methanol and tetrahydrofuran), and heating/cooling cycles at temperatures lower than 80°. Different from the solvato-responsiveness of Cu NCs in solution state, organic solvents increase nonradiative decay and quench fluorescence emission in the solid polymer matrix. It is deduced that lower temperatures (80°) trigger an irreversible change of the aggregation state of Cu NCs in the elastomer film. A strong oxidizer (e.g. H2O2) irreversibly quenches the fluorescence emission and changes its color (under sunlight) from light green to blue, by oxidizing Cu NCs to Cu2+ ions. This Cu NC-containing elastomer film illustrates a new pathway to the fabrication of multi-responsive smart optical materials, particularly for potential applications in optical data storage (e.g. thermo-printing), and multistimuli-responsive elastomeric sensors integrated into wearable devices.

Nanotechnology published new progress about Crosslinking agents. 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

Wagner, Maximilian published the artcileMultiresponsive Polymer Nanoparticles Based on Disulfide Bonds, Synthetic Route of 7575-23-7, the main research area is multiresponsive polymer nanoparticle disulfide bond.

A disulfide polymer that is triggerable by ultrasound, UV, and redox in aqueous solution and can self-assemble with ionic probe mols. into again multitriggerable assemblies is presented. It is created by oxidative coupling of a branched insoluble thiol to water-soluble ionic thiols. The synthesis via a nanopptn. technique results in charged macromol. particles with adjustable sizes between a few tens and a few hundred nanometers stable in aqueous solution Macromols. of different compositions form with pentaerythritol tetrakis(3-mercaptopropionate) as insoluble crosslinkers yielding the polymer backbone, while mercaptopropionic acid, mercaptosuccinic acid, or aminoethane thiol in varying amounts is coupled to the backbone. Mol. and nanoscale switchability of the disulfide macromol. with UV light, redox potential, and ultrasound is demonstrated. The anionic character of the polymer particles is exploited by electrostatic self-assembly with the tetra-cationic 5,10,15,20-tetrakis-(N-methyl-4-pyridyl)porphyrin and its zinc-metalated derivative, yielding supramol. composite structures as a model system for delivery. The new type of polymer particles in aqueous solution may pave an alternative way toward multiresponsive and functional materials with potential in medicine and material science.

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

Muroi, Riku published the artcileSelf-healing thiol-ene networks based on cyclodextrin-adamantane host-guest interactions, COA of Formula: C17H28O8S4, the main research area is thiol ene cyclodextrin adamantane host guest interaction.

The reactions of β-cyclodextrin, pentaerythritol propoxylate and 1-adamantanecarboxylic acid with allyl bromide in the presence of basic salts generated their allylated products (ACD, APEP and AAd, resp.). The thiol-ene photopolymerizations of these allylated compounds and pentaerythritol tetrakis(3-mercaptopropionate) (S4P) produced thiol-ene network films (ACD-S4P, ACD-APEP-S4P, ACD-AAd-S4P, APEP-AAd-S4P and ACD-APEP-AAd-S4P). The FT-IR and gel fraction measurements of the photo-cured films revealed that almost all the thiol and allyl groups were consumed, and polymer networks were certainly formed. Glass transition temperatures (0.5 and 0.3 °C) of ACD-S4P and ACD-AAd-S4P were higher than those (-9 to -15 °C) of other films incorporating APEP. The tensile strength and modulus of ACD-S4P were much higher than those of the films incorporating APEP or AAd. Only the films incorporating both ACD and AAd possessed the self-healing property. ACD-AAd-S4P showed a higher tensile strength and modulus than ACD-APEP-AAd-S4P did. ACD-AAd-S4P was healed twice at 80 °C and only once at room temperature ACD-APEP-AAd-S4P was healed only once at 80 °C. The maximum healing efficiency was 85% for tensile modulus of ACD-AAd-S4P.

Polymer published new progress about Elongation at break. 7575-23-7 belongs to class alcohols-buliding-blocks, name is Pentaerythritol tetra(3-mercaptopropionate), and the molecular formula is C17H28O8S4, COA of Formula: C17H28O8S4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts