Month: December 2022

Shibata, Mitsuhiro published the artcileBiobased polymer networks by the thiol-ene photopolymerization of allylated p-coumaric and caffeic acids, Application of Pentaerythritol tetra(3-mercaptopropionate), the main research area is biobased polymer network thiolene photopolymerization allylated coumarate caffeate.

Diallylated p-coumaric acid (A2CM) and triallylated caffeic acid (A3CF) were synthesized by the reactions of p-coumaric acid and caffeic acid with allyl bromide in the presence of potassium carbonate. The thiol-ene photopolymerization of A2CM and a pentaerythritol-based tetrathiol (S4P) as well as that of A3CF/S4P at allyl/thiol and (allyl + enone)/thiol ratios of 1/1 produced cured products. The FT-IR spectral anal. revealed that the thiol-ene reaction of allyl and thiol groups mainly progressed for the products cured at an allyl/thiol ratio of 1/1, while both allyl and enone groups reacted with thiol groups for the products cured at an (allyl + enone)/thiol ratio of 1/1. The progress of the thiol-ene reaction of the enone and thiol groups caused the lowering of the glass transition and 5% weight loss temperatures (Tg and Td5). The A3CF/S4P cured at an allyl/thiol ratio of 1/1 exhibited the highest Tg, Td5, tensile strength, and tensile modulus among all the cured products.

Polymer Journal (Tokyo, Japan) 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, Application of Pentaerythritol tetra(3-mercaptopropionate).

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

Azadi, Mehdi published the artcileThe Effect of Dissolved Gases on the Short-Range Attractive Force between Hydrophobic Surfaces in the Absence of Nanobubble Bridging, Product Details of C8H18O, the main research area is force hydrophobic surface gas solubility.

The short-range attractive forces between hydrophobic surfaces are key factors in a wide range of areas such as protein folding, lipid self-assembly, and particle-bubble interaction such as in industrial flotation. Little is certain about the effect of dissolved (well-controlled) gases on the interaction forces, in particular in those systems where the formation of surface nanobubble bridges is suppressed. Here, we probe the short-range attractive force between hydrophobized silica surfaces in aqueous solutions with varying but well-controlled isotherms of gas solubility The first contact approach force measurement method using AFM shows that decreasing gas solubility results in a decrease of the force magnitude as well as shortening of its range. The behavior was found to be consistent across all four aqueous systems and gas solubilities tested. Using numerical computations, we corroborate that attractive force can be adequately explained by a multilayer dispersion force model, which accounts for an interfacial gas enrichment (IGE), that results in the formation of a dense gas layer (DGL) adjacent to the hydrophobic surface. We found that the DGL on the hydrophobic surface is affected only by the concentration of dissolved gases and is independent of the salt type, used to control the gas solubility, which excludes the effect of elec. double-layer interactions on the hydrophobic force.

Langmuir published new progress about Dielectric constant. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Product Details of C8H18O.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Lin, Derong published the artcileStudy on the functional properties and structural characteristics of soybean soluble polysaccharides by mixed bacteria fermentation and microwave treatment, HPLC of Formula: 59-23-4, the main research area is Neurospora soybean soluble polysaccharide fermentation microwave treatment; Functional properties; Soybean soluble polysaccharides; Structural characteristics.

The soybean soluble polysaccharide was prepared by mixed fermentation of lactic acid bacteria and Neurospora crassa and microwave treatment. The functional properties and structure characteristics of soybean soluble polysaccharide before and after modification were compared. Results revealed that after fermentation treatment, the content of soybean soluble polysaccharide increased to 7.09%, which was 3.16 times that of raw materials, and the microwave treatment was further increased to 7.69%. The glucose adsorption capacity, glucose dialysis retardation index and the α-amylase activity inhibition ration of soybean soluble polysaccharides increased significantly, promotes intestinal flora growth in vitro after fermentation of mixed bacteria and microwave treatment. At the same time, the anal. of monosaccharide compound and structural characteristics showed that the monosaccharide components of soybean soluble polysaccharide were redistributed after modification treatment, SEM showed that modified soybean soluble polysaccharide has a larger surface area; Fourier Transform IR spectroscopy and X-ray Diffraction proved that the modification has slight changes in the functional groups and crystal structure of soybean soluble polysaccharide. These results suggested that okara may be a potentially inexpensive source of natural soybean soluble polysaccharide and a potential functional food ingredient.

International Journal of Biological Macromolecules published new progress about Dehydration process. 59-23-4 belongs to class alcohols-buliding-blocks, name is (2R,3S,4S,5R)-2,3,4,5,6-Pentahydroxyhexanal, and the molecular formula is C6H12O6, HPLC of Formula: 59-23-4.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Verma, Ram Swaroop published the artcileEssential oil composition of the sub-aerial parts of eight species of Cymbopogon (Poaceae), Computed Properties of 124-76-5, the main research area is cymbopogon essential oil sub aerial pinane carane myrcane.

The genus Cymbopogon (Poaceae) comprised of many species of grasses that grow in tropical and subtropical regions around the world. Some of the com. important aromatic species of Cymbopogon are cultivated for the extraction of the essential oils from their aerial-parts. In spite of wide distribution and large scale cultivation, the essential oils of the sub-aerial parts (root/rhizome) of these species have not been systematically studied so far. In this study, the hydro-distilled essential oils from the sub-aerial parts of eight species, including a hybrid of Cymbopogon, namely C. flexuosus (Nees ex Steud.) W.Watson, C. khasianus (Hack.) Stapf ex Bor, C. pendulus Nees ex Steud., C. khasianus × C. pendulus, C. winterianus Jowitt ex Bor, C. martini (Roxb.) W.Watson, C. distans (Nees ex Steud.) W.Watson, and C. jwarancusa (Jones) Schult. and their varieties/chemotypes were analyzed by gas chromatog.-flame ionization detector (GC-FID) and gas chromatog.-mass spectrometry (GC-MS). A total of thirty-three terpene C-skeleton types (six monoterpene skeletons, twenty-seven sesquiterpene skeletons) were identified. A multivariate statistical comparison by principal component anal. and agglomerative hierarchical clustering grouped the examined essential oils in to four clusters (cluster I: geraniol, and piperitone/ geraniol chemotypes; cluster II: high elemol and low elemol chemotypes; cluster III: limonene chemotype; and cluster IV: 5-epl-7-epl-α-eudesmol/eudesmanediol/hinesol, and cis-p-menth-2-en-1-ol/trans-p-menth-2-en-1-ol/eudesmanediol chemotypes).

Industrial Crops and Products published new progress about Cymbopogon citratus. 124-76-5 belongs to class alcohols-buliding-blocks, name is rel-(1R,2R,4R)-1,7,7-Trimethylbicyclo[2.2.1]heptan-2-ol, and the molecular formula is C10H18O, Computed Properties of 124-76-5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Zhu, Minqian published the artcileStructural characterization and immunological activity of pectin polysaccharide from kiwano (Cucumis metuliferus) peels, Application In Synthesis of 59-23-4, the main research area is Cucumis peel macrophage immunol pectin polysaccharide; Immunological activity; Kiwano (Cucumis metuliferus) peels; Pectin polysaccharide; Structural characterization.

Two novel polysaccharides, namely CMPP-1 and CMPP-2, from kiwano (Cucumis metuliferus) peels were isolated through hot-water extraction, followed by ethanol precipitation and column chromatog. The results showed that CMPP-1 and CMPP-2 were hetero-galacturonans with different mol. weights of 7.35 kDa and 6.90 kDa, resp. Both of CMPP-1 and CMPP-2 were mainly composed of glucuronic acid (45.93% and 51.75%, resp.), and other monosaccharides including rhamnose, arabinose, galactose, glucose, xylose, fucose, mannose, galacturonic acid, and mannuronic acid. The results of structural characterization from FT-IR and NMR confirmed that CMPP-1 and CMPP-2 were pectin with highly branched structure. Furthermore, both CMPP-1 and CMPP-2 possessed immune-enhancing activity and could enhance the secretion of nitric oxide and cytokines (TNF-α, IL-6) in a dose-dependent manner. Especially, CMPP-1 had higher immune activity than CMPP-2 as the min. effective concentration were 0.78μg/mL and 6.25μg/mL, resp. These findings provide a scientific basis for further utilization of polysaccharide from kiwano peels.

Carbohydrate Polymers published new progress about Cucumis metuliferus. 59-23-4 belongs to class alcohols-buliding-blocks, name is (2R,3S,4S,5R)-2,3,4,5,6-Pentahydroxyhexanal, and the molecular formula is C6H12O6, Application In Synthesis of 59-23-4.

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

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

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

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