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[Polym. Chem.] Phase transition dynamics and mechanism for backbone-thermoresponsive hyperbranched polyethers
In this study, a controllable thermo-induced phase transition process was first observed in the aqueous solution of backbone-thermoresponsive hyperbranched polyethers. According to the variable temperature UV-visible spectrophotometry, the phase transition process was extremely slow as temperature was set around lower critical solution temperature (LCST). Fluorescence tests showed...
http://www.polymer.cn//ss/tianwei/publicationsshow_7925.html |
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Metallopolymers with transition metals in the side-chain by living and controlled polymerization techniques
Work on side-chain transition metal-containing polymers prepared by controlled and living polymerizations is summarized, including living anionic polymerization (LAP), ringopening metathesis polymerization (ROMP) and controlled radical polymerization (CRP) such as atom transfer radical polymerization (ATRP), reversible addition-fragmentation chain transfer polym...
http://www.polymer.cn//ss/yanyi/publicationsshow_7670.html |
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Understanding the effect of chain entanglement on the glass transition of a hydrophilic polymer
In this article, we report an interesting phenomenon of the glass transition temperature (Tg) deviation of a hydrophilic polymer. Polyacrylamide (PAL) samples with different extents of chain entanglement were prepared by spray drying and solution casting. We found that the glass transition temperature increases as the extent of chain entanglement decreases upon the sub-Tg annealing. The...
http://www.polymer.cn//ss/cenglxl/publicationsshow_7485.html |
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Phase Transition Dynamics and Mechanism for Backbone-Thermoresponsive Hyperbranched Polyethers
In this study, a controllable thermo - induced phase transition process was first observed in the aqueous solution of backbone -thermoresponsive hyperbranched polyethers. According to the variable temperature UV?visible spectrophotometry, the phase transition process was extre...
http://www.polymer.cn//ss/fanxd/publicationsshow_6693.html |
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Phase Transition and Rheological Behaviors of Concentrated Cellulose/Ionic Liquid Solutions
The phase transition and rheological behaviors of concentrated solutions of microcrystalline cellulose (MCC) in an ionic liquid of 1-allyl-3-methylimidazolium chloride (AMIMCl) have been investigated. Polarized optical microscopy (POM) measurements indicate that the two critical cellulose concentrations for the appearance of biphase and fully anisotropic phase for MCC/AMIMCl solutions are 9 and 16...
http://www.polymer.cn//ss/hongzansong/publicationsshow_6439.html |
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190. Studies on Crystal Transition of Polyamide 11 Nanocomposites by Variable-temperature X-Ray Diffraction.
Polyamide 11 (PA11) and its nanocomposites with different organoclay loadings were prepared by melt-compounding and subsequent pelletizing. The crystal phase transitions of PA11 and its clay nanocomposites were investigated by variable-temperature X-ray diffraction. It was found that the Brill transition of the nanocomposite was 20 K higher than that of the neat PA11 for both heating and cooling p...
http://www.polymer.cn//ss/liutianxi/publicationsshow_5974.html |
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Study of the Kinetics of the Pancake-to-Brush Transition of Poly(N-isopropylacrylamide) Chains
The chemical grafting of thiol-terminated poly(N-isopropylacrylamide) (HS-PNIPAM) chains to a gold surface from a solution was investigated with a quartz crystal microbalance (QCM) in real time. The frequency and energy dissipation responses revealed that short HS-PNIPAM chains exhibit three-regime kinetics of the grafting. In regimes I and II, the HS-PNIPAM chains form pancake an...
http://www.polymer.cn//ss/chengheiccas/publicationsshow_5602.html |
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Silk fibroin/Montmorillonite nanocomposites: effect of pH on the conformational transition and clay dispersion
By adjusting the solution pH value below the isoelectric point (pI) of silk fibroin (SF) protein, the SF was in the cation state and it could interact strongly with unmodified anionic montmorillonite (MMT) surface. In this way, novel SF-MMT nanocomposites with good clay dispersion were successfully obtained, which were confirmed by
X-ray diffraction and transmission electron microscopy. Further 1H...
http://www.polymer.cn//ss/sunpingchuan/publicationsshow_5161.html |
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Thermoresponsive Supramolecular Dendronized Copolymers with Tunable Phase Transition Temperatures
Supramolecular copolymerization from a mixture of comonomers with different hydrophilicities may offer an easy and convenient access to form thermoresponsive supramolecular copolymers with varied phase transition temperatures by simply varying ratios of the comonomers. Herein, supramolecular dendronized copolymers (SDCPs) were constructed via host–guest interaction from a linear polymer carr...
http://www.polymer.cn//ss/zaf/publicationsshow_4553.html |
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Rheology and thermal transition state of polyvinyl alcohol–cassava starch blends
Rheology and thermal transition state of polyvinyl alcohol–cassava starch blends
http://www.polymer.cn//ss/sunzhaoyan/publicationsshow_4539.html |
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