Month: December 2022

Borde, B. published the artcileA DSC study of hydrated sugar alcohols: isomalt, SDS of cas: 64519-82-0, the main research area is isomalt dehydration melting structural relaxation glass transition.

A DSC study was carried out on isomalt, a com. sugar alc. derived from sucrose and widely used as a sweetener in the food industry. Isomalt is a mixture of two isomers: α-D-glucopyranosyl-1-6-mannitol and α-D-glucopyranosyl-1-6-sorbitol. Release of the water of crystallization (around 100°C) and melting (around 150°C) were phenomenol. characterized using different scanning rates and heat treatments. The effect of dehydration/re-hydration on the melting was investigated. The isomalt glass transition, at about 60°C, was studied on samples cooled after melting. The dynamic aspect of structural relaxation of isomalt was quantified by its fragility parameter. Glassy state stability was evaluated by performing ageing experiments at sub-Tg temperatures During ageing, apart from the expected enthalpy relaxation effects, isomalt showed a peculiar behavior, due to its isomeric composition These preliminary and phenomenol. results were interpreted in terms of isomer structure and of carbohydrate-water interactions in the mixture

Journal of Thermal Analysis and Calorimetry published new progress about Aging of materials. 64519-82-0 belongs to class alcohols-buliding-blocks, name is (3R,4R,5R)-6-(((2S,3R,4S,5S,6R)-3,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexane-1,2,3,4,5-pentaol, and the molecular formula is C12H24O11, SDS of cas: 64519-82-0.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Acosta Ortiz, Ricardo published the artcileTensile strength and fracture mode I toughness of photocurable carbon fiber/polyether-polythioether composites, Computed Properties of 7575-23-7, the main research area is carbon fiber polyether polythioether composite tensile strength fracture toughness.

This paper reports the development of a novel photocurable carbon fiber/polyether-polythioether (TF CFEC) composite and the comparison of its mech. performance with that of a conventional thermally cured carbon fiber-epoxi composite (CTC CFEC). Unidirectional carbon fiber (CF) was used as the reinforcement agent in both composites. In the case of the TF CFEC, the CF employed was surface-functionalized with thiol groups to promote chem. bonding to the polyether-polythioether matrix derived from the epoxy/thiol-ene system. This was achieved by means of a transesterification reaction of (3-mercaptopropyl) trimethoxysilane (MPTS) with the hydroxyl groups produced on the surface of the CF after an oxidative plasma treatment. Mech. testing revealed that although TF CFEC displayed slightly lower mech. properties than CTC CFEC, it exhibited 50% higher fracture toughness. This difference in behavior was explained by the difference in the chem. nature of both polymeric matrixes, where a highly crosslinked poly(hydroxyl-amine) is produced in the case of CTC CFEC, while a polyether-polythioether matrix with inherent toughness due to the flexibility of polythioethers, is obtained during the photo-thermal treatment to obtain TF CFEC. Considering that TF CFEC was cured in only 1h at 40 mW/cm2 of UV intensity and 85°C, and the CTC CFEC was cured at room temperature for 4h, followed by heating at 100°C for 4h, there is considerable energy savings in the production of the photocurable composite. The result is a cost-effective process that could have potential applications in the automotive and aerospace industries.

Journal of Polymer Research published new progress about Aerospace industry. 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

Kucharska, Jarmila published the artcileTreatment with coenzyme Q10, ω-3-polyunsaturated fatty acids and their combination improved bioenergetics and levels of coenzyme Q9 and Q10 in skeletal muscle mitochondria in experimental model of arthritis, SDS of cas: 97-67-6, the main research area is COQ10 omega3PUFA antiarthritic agent mitochondrial bioenergetics adjuvant arthritis.

Rheumatoid arthritis (RA) and its animal model adjuvant arthritis (AA) are inflammatory diseases characterized by chronic inflammation, systemic oxidative stress and disturbed mitochondrial bioenergetics of skeletal muscle. The present study aimed to evaluate the effects of coenzyme Q10 – CoQ10 (100 mg/kg b.w.), omega-3-polyunsaturated fatty acids – ω-3-PUFA (400 mg/kg b.w.) and their combined treatment in AA on impaired skeletal muscle mitochondrial bioenergetics, inflammation and changes in levels CoQ9 and CoQ10 in plasma. Markers of inflammation (C-reactive protein, monocytechemotactic protein-1), antioxidant capacity of plasma, respiratory chain parameters of skeletal muscle mitochondria and concentrations of CoQ9 and CoQ10 in plasma and in muscle tissue were estimated Treatment of the arthritic rats with CoQ10, ω-3-PUFA alone and in combination partially reduced markers of inflammation and increased antioxidant capacity of plasma, significantly increased concentrations of coenzyme Q in mitochondria and improved mitochondrial function in the skeletal muscle. Combined treatment has similar effect on the mitochondrial function as monotherapies; however, it has affected inflammation and antioxidant status more intensively than monotherapies. Long-term supplementary administration of coenzyme Q10 and ω-3-PUFA and especially their combination is able to restore the impaired mitochondrial bioenergetics and antioxidant status in AA.

Physiological Research (Prague, Czech Republic) published new progress about Adjuvant arthritis. 97-67-6 belongs to class alcohols-buliding-blocks, name is (S)-2-hydroxysuccinic acid, and the molecular formula is C4H6O5, SDS of cas: 97-67-6.

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

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

Bolhuis, Gerad K. published the artcilePolyols as filler-binders for disintegrating tablets prepared by direct compaction, Formula: C12H24O11, the main research area is tablet filler binder polyol direct compaction compression disintegration.

Although polyols are frequently used as tablet excipients in lozenges, chewing tablets, and orodisperse tablets, special directly compressible (DC) forms are recommended as filler-binder in common disintegrating tablets. In this article, DC types of isomalt, lactitol, mannitol, sorbitol and xylitol are evaluated. Tablets of both lubricated and unlubricated DC polyols and theophylline tablets were compressed at different forces using a compaction simulator or a motorized hydraulic press. Disintegration times (without disks) and dissolution rate were measured according to Ph.Eur. Compaction profiles show that the DC forms of isomalt, mannitol and sorbitol have sufficient compactibility and a low lubricant sensitivity. The crushing strengths of tablets, prepared from DC lactitol and xylitol, are too low for practical use. Because of their reduced hygroscopicity and smaller capping tendency as compared with DC sorbitol, DC types of isomalt and mannitol seem to be the most convenient filler-binders. Because of their high water solubility, tablets prepared from polyols erode rather than disintegrate. Tablet formulations with theophylline as a test drug and DC isomalt or DC mannitol as filler-binder show that both products have their own limitations: DC mannitol gives more adhesion problems than DC isomalt. On the other hand, the disintegration time and drug dissolution rate for tablets containing DC mannitol is faster than for tablets containing DC isomalt. Of the DC polyols investigated, both DC isomalt and DC mannitol are the most suitable filler-binders for disintegrating tablets, prepared by direct compaction.

Drug Development and Industrial Pharmacy published new progress about Adhesion, physical. 64519-82-0 belongs to class alcohols-buliding-blocks, name is (3R,4R,5R)-6-(((2S,3R,4S,5S,6R)-3,4,5-Trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)hexane-1,2,3,4,5-pentaol, and the molecular formula is C12H24O11, Formula: C12H24O11.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Wu, Shuanggen published the artcileDeep Eutectic Supramolecular Polymers: Bulk Supramolecular Materials, Formula: C4H6O5, the main research area is deep eutectic supramol polymer bulk; deep eutectic solvents; materials science; polymers; self-assembly; supramolecular chemistry.

Application of new strategies for supramol. self-assembly can significantly impact the properties and/or functions of supramol. polymers. To realize a facial strategy for the development of solvent-free supramol. polymers in bulk, “”deep eutectic solvents”” were employed. Cyclodextrins and natural acids were used to prepare deep eutectic supramol. polymers (DESPs). Deep eutectic solvents have special characteristics that endow DESPs with unique macroscopic properties and excellent processability. DESPs exhibit supramol. adhesion and temperature-dependent behavior originating from the combined effects of deep eutectic solvents and supramol. polymerization Because DESPs are solvent-free and display interesting macroscopic properties, they have potential as new adaptive materials.

Angewandte Chemie, International Edition published new progress about Adhesion, physical. 97-67-6 belongs to class alcohols-buliding-blocks, name is (S)-2-hydroxysuccinic acid, and the molecular formula is C4H6O5, Formula: C4H6O5.

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

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

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