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首页> 外文期刊>Journal of Applied Polymer Science >Solvent-solubility-parameter-dependent homogeneity and sol-gel transitions of concentrated polyacrylonitrile solutions
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Solvent-solubility-parameter-dependent homogeneity and sol-gel transitions of concentrated polyacrylonitrile solutions

机译：溶剂 - 溶解度 - 参数依赖性均匀性和浓缩聚丙烯腈溶液的溶胶 - 凝胶转变

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In this study, we systematically explored the dependence of the homogeneity and sol-gel transition temperatures of various polyacrylonitrile (PAN) solutions on the solvent solubility parameters. The Cole-Cole slope was used to characterize the solution homogeneity, and we found that the PAN/dimethyl sulfoxide (DMSO) solution, which had a smaller Hansen solubility parameter distance between the solvent and PAN, showed better solution homogeneity than the PAN/dimethylformamide and PAN/dimethylacetamide solutions. Additionally, we found that both heating and cooling were able to cause the gelation of the PAN solution, although their mechanisms were totally different. The gelation caused by heating was ascribed to the nitrile-nitrile coupling of PAN chains, whereas the gelation caused by cooling was due to the solvent bridge effect. In this case, DMSO, which had the highest polarity and the strongest interactions with nitrile groups, caused the highest gelation temperature of the PAN solution during cooling. The gelation temperature of the PAN solution exhibits dependence on its solvent polarity. (C) 2017 Wiley Periodicals, Inc.
机译：在这项研究中，我们系统地探讨了各种聚丙烯腈（PAN）溶液对溶剂溶解度参数的均匀性和溶胶 - 凝胶过渡温度的依赖性。 COLE-COLE斜率用于表征溶液均匀性，并且我们发现溶剂和盘之间具有较小的汉森溶解度参数距离的平移/二甲基亚甲醚（DMSO）溶液，显示出比锅/二甲基甲酰胺更好的均匀溶液均匀性和平移/二甲基乙酰胺溶液。此外，我们发现，虽然它们的机制完全不同，但我们发现加热和冷却能够引起锅溶液的凝胶化。由加热引起的凝胶化归因于锅链的腈 - 腈偶联，而冷却引起的凝胶化由于溶剂桥效应。在这种情况下，具有最高极性和与腈基相互作用的DMSO导致冷却过程中锅溶液的最高凝胶化温度。 PAN溶液的凝胶化温度表现出依赖于其溶剂极性。 （c）2017 Wiley期刊，Inc。

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