Synthesis of high-molecular weight isosorbide-based polycarbonates through efficient activation of endo-hydroxyl groups by an ionic liquid

2019 ◽  
Vol 21 (14) ◽  
pp. 3891-3901 ◽  
Author(s):  
Zhencai Zhang ◽  
Fei Xu ◽  
Hongyan He ◽  
Weilu Ding ◽  
Wenjuan Fang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Hydrogen Bond ◽  
Ionic Liquid ◽  
High Molecular Weight ◽  
Hydroxyl Groups

A high-molecular weight bio-based polycarbonate was successfully synthesized by breaking the hydrogen bond of endo-OH group using an ionic liquid.

Ionic liquid coated lipase: Green synthesis of high molecular weight poly(1,4-dioxan-2-one)

2012 ◽  
Vol 77 ◽  
pp. 46-52 ◽  
Author(s):  
Feng-Xia Dong ◽  
Lei Zhang ◽  
Xiao-Zuo Tong ◽  
Hong-Bing Chen ◽  
Xiu-Li Wang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ionic Liquid ◽  
Green Synthesis ◽  
High Molecular Weight ◽  
High Molecular Weight Poly

High Molecular Weight Polystyrene Obtained by Cationic Emulsion Polymerization Catalyzed by Imidazolium‐Based Ionic Liquid

2018 ◽  
Vol 13 (2) ◽  
pp. 1800061 ◽  
Author(s):  
Vinicius M. B. Patrocinio ◽  
Tamara Agner ◽  
Gabriel V. S. Dutra ◽  
Fabricio Machado ◽  
Brenno A. D. Neto ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ionic Liquid ◽  
Emulsion Polymerization ◽  
High Molecular Weight

Synthesis of bio-based polycarbonate via one-step melt polycondensation of isosorbide and dimethyl carbonate by dual site-functionalized ionic liquid catalysts

2021 ◽  
Author(s):  
Zifeng Yang ◽  
Xue Li ◽  
Fei Xu ◽  
Weiwei Wang ◽  
Yongqing Shi ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
High Molecular Weight ◽  
Dimethyl Carbonate ◽  
Synthetic Pathway ◽  
Melt Polycondensation ◽  
Direct Melt Polycondensation ◽  
One Step ◽  
Dual Site

A synthetic pathway for high molecular weight isosorbide-based polycarbonate was developed via one-step direct melt polycondensation of isosorbide and dimethyl carbonate catalyzed by dual site-functionalized ionic liquids.

scholarly journals Investigation of penetration into woven fabric specimens impregnated with shear thickening fluid

2018 ◽  
Vol 25 (1) ◽  
pp. 205-212 ◽  
Author(s):  
Naser Kordani ◽  
Ali Sadough Vanini
Keyword(s):  
Molecular Weight ◽  
Hydrogen Bond ◽  
Shear Rate ◽  
High Molecular Weight ◽  
Particle Surface ◽  
Shear Thickening ◽  
Silica Particles ◽  
Woven Fabric ◽  
Critical Shear Rate ◽  
Shear Thickening Fluid

AbstractIn this paper, the effect of weight fraction of nano silica (hydrophilic fumed silica particles) and molecular mass of polyethylene glycol (PEG) on the rheological properties such as the critical shear rate of fluids has been studied. Dynamic moduli based on strain and the effects of increasing the molecular weight are presented. Constructed samples with high-molecular-weight PEG have higher initial, final and critical viscosities. Also, higher molecular chains in the polymer and preventing the movement of most of these chains against the relative motion of liquid (viscosity) will cause higher viscosity in samples. Critical shear rate is lower in the provided samples with high-molecular-weight PEG. Polymer branches in these suspensions are absorbed by the surface of the particles. Due to OH bonds in the silica particles and also due to the presence of this bond in PEG, creating a hydrogen bond is likely. Such a hydrogen bond between the polymer yarn and the particle surface causes surface absorption of the particles. To show the effect of molecular weight on fibers, woven fabric specimens impregnated with shear thickening fluid (STF) have been examined by penetration and pressure test diagrams have been investigated. In a sample with higher molecular weight, displacement to yield point is higher and residence to penetration does not show much difference.

An Easy Route for the Preparation of Soluble High Molecular Weight Polymer Under Friedel-Crafts Conditions

2014 ◽  
Vol 887-888 ◽  
pp. 989-992 ◽  
Author(s):  
Cong Qi Li ◽  
Bo Yu ◽  
Cheng Wang ◽  
Yong Xi Li ◽  
Yu Chen
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
High Yield ◽  
Hydroxyl Groups ◽  
Synthetic Method ◽  
Polycondensation Reaction ◽  
Hydrogen Atoms ◽  
High Molecular Weight Polymer ◽  
Molecular Weight Polymer ◽  
Short Reaction Time

A facile synthetic method that would be applied to polycondensation reaction between monomer A with bifunctional hydroxyl groups and monomer B with bifunctional reactive hydrogen atoms under Friedel-Crafts conditions was described. This approach, which has the advantage of short reaction time, high yield and simple synthesis operation, opens a way to prepare soluble high molecular weight polymers by the polycondensation reaction between monomer A with bifunctional hydroxyl groups and monomer B with bifunctional reactive hydrogen atoms under Friedel-Crafts conditions.

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