Category: alcohols-buliding-blocks

Morris, Danny S. published the artcileDeoxydehydration of vicinal diols and polyols catalyzed by pyridinium perrhenate salts, Name: 1-(4-Bromophenyl)ethane-1,2-diol, the main research area is vicinal diol polyol pyridinium perrhenate deoxydehydration catalyst; alkene preparation.

Simple ammonium and pyridinium perrhenate salts were evaluated as catalysts for the deoxydehydration (DODH) of diols into alkenes. Pyridinium perrhenates were found to be effective catalysts at much lower temperatures than those in previous reports, outperforming primary, secondary, and tertiary ammonium salts, while quaternary ammonium salts are effectively inactive. The mechanism of reaction was studied computationally using DFT calculations which indicate that proton shuttling between the ion pair is intrinsic to the mechanism and that the reduction of rhenium by the phosphine occurs before the diol condensation.

Catalysis Science & Technology published new progress about Activation energy. 92093-23-7 belongs to class alcohols-buliding-blocks, name is 1-(4-Bromophenyl)ethane-1,2-diol, and the molecular formula is C8H9BrO2, Name: 1-(4-Bromophenyl)ethane-1,2-diol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Zhao, Man published the artcileMixtures of octanol and an ionic liquid: Structure and transport, Recommanded Product: n-Octanol, the main research area is structure transport mixture octanol ionic liquid.

Ionic liquids (ILs) with long alkyl substituents are amphiphilic, which leads to a bicontinuous liquid structure. The strongly interacting anionic and cationic head groups form a long range charge network, with the hydrocarbon tails forming a nonpolar domain. Such nonpolar domains have been shown to dissolve a variety of neutral organic solvents. In mixtures of ILs with solvents the neutral organic mols. residing in the nonpolar domains experience different environments and friction from the charged cations and anions. Thus, the neutral mols. diffuse much faster than predicted by hydrodynamic scaling using the average viscosity of the mixture In this work, we report studies on the structure and transport properties of mixtures of 1-octanol with the IL trihexyltetradecylphosphonium bis(trifluoromethylsulfonyl)imide (P6,6,6,14+/NTf2-). The majority of the atom fraction in the P6,6,6,14+ cation comprises four hydrocarbon substituents. The unique amphiphilic nature of ILs with the P6,6,6,14+ cation makes 1-octanol fully miscible with the IL at ambient temperatures X-ray scattering experiments show that the IL structure persists in the mixtures for 1-octanol mole fractions as large as xoct = 0.90. The self-diffusion coefficients of the three mol. species in the mixtures were measured by NMR experiments The self-diffusion of the P6,6,6,14+ cation is well described by the Stokes-Einstein equation, while the diffusivity of the NTf2- anion is slightly lower than the hydrodynamic prediction. The measured diffusivities of octanol in these mixtures are 1.3-4 times higher than the hydrodynamic predictions. (c) 2020 American Institute of Physics.

Journal of Chemical Physics published new progress about Activation energy. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, Recommanded Product: n-Octanol.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Garg, Mayank published the artcileSacrificial Cyclic Poly(phthalaldehyde) Templates for Low-Temperature Vascularization of Polymer Matrices, Application In Synthesis of 7575-23-7, the main research area is sacrificial cyclic polyphthalaldehyde template temperature vascularization polymer matrice.

Sacrificial polymers that depolymerize into small mols. upon exposure to an external stimulus facilitate the fabrication of synthetic structures with embedded vascular networks. Many sacrificial polymers such as poly(lactic acid) (PLA) and polycarbonates possess high thermal stability, leading to a time- and energy-intensive vascularization process. Furthermore, the use of these polymer templates is limited to high-temperature-resistant (>180°C) matrixes. Here, we demonstrate the rapid vascularization of a range of host matrixes through the thermally triggered depolymerization of cyclic poly(phthalaldehyde) (cPPA) at temperatures near 100°C. Complete mass loss of solvent-cast cPPA films is observed within 2 h at 100°C in a thermogravimetric analyzer and after embedding in poly(dicyclopentadiene) matrixes. The thermal processing of cPPA into sacrificial templates for inverse vascular architectures is hindered due to depolymerization at low temperatures We successfully overcome these templating challenges by using solution spinning and 3D printing to fabricate fibers and printed templates, resp. Microchannels are created inside lowglasstransition temperature (42 and 65°C) epoxy-based matrixes by depolymerizing the embedded fibers and printed templates within 1 h at 110°C. This low-temperature cPPA evacuation protocol enables the vascularization of matrixes that would not survive the harsh thermal cycle required for depolymerizing existing sacrificial polymers. Moreover, cPPA depolymerization affords a fivefold reduction in the thermal energy consumed during template removal compared to PLA.

ACS Applied Polymer Materials published new progress about Activation energy. 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

Meng, Xiaorong published the artcileStudy on stable mass transfer and enrichment of phenol by 1-octanol/kerosene/polyvinyl chloride polymer inclusion membrane, SDS of cas: 111-87-5, the main research area is octanol polyvinyl chloride kerosene liquid paraffin phenol mass transfer; 1-Octanol; Mass transfer; Phenol; Polymer inclusion membrane; Stability.

A polymer inclusion membrane (PIM) that contains a polyvinyl chloride (PVC) polymer matrix and 1-octanol (OCT) as specific carrier (PO-PIM) was prepared to investigate the mass transfer behavior of phenol in aqueous solutions Results showed that the mass transfer behavior of the PO-PIM for phenol conformed to the first-order kinetics. In addition, the mass transfer efficiency for phenol reached the maximum when the OCT content was 82.8 wt%. The mass transfer activation energy (Ea) was 14.46 kJ mol-1, which indicated that intramembranous diffusion was the main controlling factor in the mass transfer process. The introduction of hydrophobic additives, such as kerosene, liquid paraffin and vegetable oil, into the PO-PIM could remarkably improve its stability. In an aqueous solutions of phenol ranging from 0 mg L-1 to 9000 mg L-1, the initial flux (J0) of kerosene/PVC/OCT-PIM (KPO-PIM) was pos. correlated with the initial concentration of phenol. For a stripping solution with a feed solution pH of 2.0 and a sodium hydroxide concentration of 0.1 mol L-1, the maximum permeability coefficient during stable mass transfer reached 12.55μm s-1. At a mass transfer area of 3.14 cm2, an enrichment factor (EF) of 3.5 for 200 mg L-1 of phenolic aqueous solution was achieved within 48 h through KPO-PIM.

Environmental Pollution (Oxford, United Kingdom) published new progress about Activation energy. 111-87-5 belongs to class alcohols-buliding-blocks, name is n-Octanol, and the molecular formula is C8H18O, SDS of cas: 111-87-5.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts

Grewal, Manjit Singh published the artcileBifunctional poly(ethylene glycol) based crosslinked network polymers as electrolytes for all-solid-state lithium ion batteries, SDS of cas: 7575-23-7, the main research area is PEG crosslinked network polymer solid state lithium ion battery.

Polymer electrolyte based lithium ion batteries represent a revolution in the battery community due to their intrinsic enhanced safety, and as a result polymer electrolytes have been proposed as a replacement for conventional liquid electrolytes. Herein, the preparation of a family of crosslinked network polymers as electrolytes via the ‘click-chem.’ technique involving thiol-ene or thiol-epoxy is reported. These network polymer electrolytes comprise bifunctional poly(ethylene glycol) as the lithium ion solvating polymer, pentaerythritol tetrakis (3-mercaptopropionate) as the crosslinker and lithium bis(trifluoromethane)sulfonimide as the lithium salt. The crosslinked network polymer electrolytes obtained show low Tg, high ionic conductivity and a good lithium ion transference number (ca 0.56). In addition, the membrane demonstrated sterling mech. robustness and high thermal stability. The advantages of the network polymer electrolytes in this study are their harmonious characteristics as solid electrolytes and the potential adaptability to improve performance by combining with inorganic fillers, ionic liquids or other materials. In addition, the simple formation of the network structures without high temperatures or light irradiation has enabled the practical large-area fabrication and in situ fabrication on cathode electrodes. As a preliminary study, the prepared crosslinked network polymer materials were used as solid electrolytes in the elaboration of all-solid-state lithium metal battery prototypes with moderate charge-discharge profiles at different current densities leaving a good platform for further improvement. © 2018 Society of Chem. Industry.

Polymer International published new progress about Activation energy. 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

Chen, Kai published the artcileA semi-interpenetrating network polymer electrolyte membrane prepared from non-self-polymerized precursors for ambient temperature all-solid-state lithium-ion batteries, Computed Properties of 7575-23-7, the main research area is PEG semi interpenetrating network electrolyte membrane lithium battery.

Solid polymer electrolytes (SPEs) are currently attracting widespread interest for lithium battery applications due to high safety, low volatility, and the ability to suppress Li dendrites. Herein, a novel all-solid-state polymer electrolyte with semi-interpenetrating network (semi-IPN) structure has been prepared The semi-IPN SPE is fabricated by thiol-tosylate polycondensation of pentaerythritol terakis (3-mercaptopropionate) (PETMP) with non-self-polymerized precursors, ditosylate poly (ethylene glycol) (DTsPEG) and p-toluenesulfonyl poly (ethylene glycol) Me ether (TsPEGME), and then blended with a high mol. weight polyethylene oxide (PEO, Mw = 300 kg mol-1). The resulting self-standing membrane achieves an excellent ionic conductivity (1.3 x 10-4 S cm-1) at ambient temperature, and exhibits an electrochem. stability window up to 4.3 V vs. Li/Li+. The LiFePO4/semi-IPN-SPE/Li battery exhibits a first discharging capacity of 143.1 mA h g-1 at 0.2C and the discharge capacity keeps 134 mA h g-1 after 100 charge and discharge cycles.

Journal of Solid State Chemistry published new progress about Activation energy. 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, Qiong published the artcileConcurrent thiol-ene competitive reactions provide reprocessable, degradable and creep-resistant dynamic-permanent hybrid covalent networks, Recommanded Product: Pentaerythritol tetra(3-mercaptopropionate), the main research area is polythioacetal polythioether green chem degradation creep resistance recycling thermostability.

A catalyst-free, solvent-free thiol-ene addition reaction was developed to produce a dynamic-permanent hybrid cross-linked polymer from two simple components, a tetrathiol and a divinyl ether, in one pot. The tetrathiol and divinyl ether underwent two competitive Markovnikov and anti-Markovnikov addition reactions simultaneously and sep. generated S,O-thioacetal cross-links and thioether cross-links. The dynamic feature of S,O-thioacetal cross-links imparts excellent malleability, reprocessability and degradability to the obtained network, and the permanent covalent thioether cross-links provide favorable high-temperature creep resistance. This work will broaden the thiol-ene chem. and provide a green method to achieve recyclable cross-linked polymers and covalent adaptable networks (CANs) or vitrimer-like materials with high-temperature creep resistance.

Green Chemistry published new progress about Activation energy. 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

Lin, Xueyan published the artcileImine-Based Reactive Mesogen and Its Corresponding Exchangeable Liquid Crystal Elastomer, Formula: C17H28O8S4, the main research area is imine reactive mesogen corresponding exchangeable liquid crystal elastomer.

To date, exchangeable liquid crystalline elastomers (xLCEs) are mainly fabricated by combining conventional LCEs with addnl. exchangeable functional groups in their networks. While conventional LCEs are frequently made from com. available aromatic-ester reacting mesogens, or from mesogens based on biphenyl core, such reacting monomers are not optimized to fabricating xLCEs whose bond-exchange reaction is fast and clean-cut. Here, we develop a fast synthesis route to produce a new type of reactive mesogen based on an aromatic-imine structure that intrinsically enables a fast and stable bond-exchange reaction in the resulting imine-based xLCE. This new xLCE displays vitrimer plastic-flow behavior and its bond-exchange activation energy is calculated to be 54 kJ/mol. We also demonstrate that this xLCE is thermally stable, to withstand many recycling cycles without visible decay, and its liquid crystallinity is preserved. Finally, we demonstrate the reprogramming and realignment of mesogen orientation in this xLCE, with the realigned xLCE capable of reversible thermal actuation.

Macromolecules (Washington, DC, United States) published new progress about Activation energy. 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

Zhang, Huan published the artcileRecyclable, Self-Healing, Thermadapt Triple-Shape Memory Polymers Based on Dual Dynamic Bonds, Safety of Pentaerythritol tetra(3-mercaptopropionate), the main research area is recyclable self healing thermadapt triple shape memory dynamic bond; butadiene rubber modified double bond dynamic; dynamic bond; recyclability; self-healing; solid-state plasticity; triple-shape memory.

Fabricating a single polymer network with a combination of a multi-shape memory effect (multiple-SME), solid-state plasticity, recyclability and self-healing behavior remains a challenge. We designed imine bond and ionic hydrogen bond dual crosslinked polybutadiene (PB) networks. The resulting PB networks showed a triple-shape memory effect, where imine bonds could be used to fix the permanent shape and ionic hydrogen bonds and glass transition acted as the transition segments for fixing/releasing the temporary shapes. Addnl., the dual dynamic bonds offered PB networks outstanding solid-state plasticity, recyclability and self-healing behavior. This strategy provides some insights for preparing shape memory polymers integrating multiple-SME and multi-functionality.

ACS Applied Materials & Interfaces published new progress about Activation energy. 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

Lei, Zhihui published the artcileThermal pyrolysis characteristics and kinetics of hemicellulose isolated from Camellia Oleifera Shell, Application of (2R,3S,4S,5R)-2,3,4,5,6-Pentahydroxyhexanal, the main research area is Camellia Oleifera shell hemicellulose extraction thermal decomposition kinetics; Camellia Oleifera Shell; Hemicelluloses; Kinetic; Pyrolysis; Thermogravimetric analysis.

Camellia Oleifera Shell (COS) is a kind of renewable lignocellulose resource and contains abundant hemicelluloses. In this work, the hemicelluloses in COS were extracted by alkali treatment and precipitated by ethanol with different concentration Thermal pyrolysis kinetics of COS hemicelluloses were investigated using a thermogravimetric analyzer at the heating rates of 5, 10, and 20 °C/min based on Coats-Redfern, Flynn-Wall-Ozawa (FWO), and Kissinger-Akahira-Sunose (KAS) model. The results showed that the best fitting thermal pyrolysis mechanism of COS hemicelluloses was one-dimensional diffusion reaction analyzed by Coats-Redfern model. The activation energies of COS hemicelluloses ranged from 175.07 to 247.87 kJ·mol-1 and from 174.74 to 252.50 kJ·mol-1 calculated by FWO and KAS, resp. The thermal stabilities of COS hemicelluloses were enhanced with the precipitated ethanol concentration increasing, and reflected by thermodn. parameters ΔH, ΔG and ΔS. This study may provide basic theor. supports for the thermochem. conversion of COS hemicelluloses.

Bioresource Technology published new progress about Activation energy. 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 of (2R,3S,4S,5R)-2,3,4,5,6-Pentahydroxyhexanal.

Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts