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首页> 外文期刊>Journal of Applied Polymer Science >New solvent for polyrotaxane. III. Dissolution of a poly(ethylene glycol)/cyclodextrin polyrotaxane in a calcium thiocyanate aqueous solution or N-methylmorpholine-N-oxide monohydrate
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New solvent for polyrotaxane. III. Dissolution of a poly(ethylene glycol)/cyclodextrin polyrotaxane in a calcium thiocyanate aqueous solution or N-methylmorpholine-N-oxide monohydrate

机译：聚轮烷的新溶剂。三，聚乙二醇/环糊精聚轮烷在硫氰酸钙水溶液或N-甲基吗啉-N-氧化物一水合物中的溶解

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摘要

Calcium thiocyanate [Ca(SCN)(2)] aqueous solutions above 40 wt % and N-methylmorpholine N-oxide (NMMO) monohydrate, which are known to dissolve cellulose, were found to be good solvents for a polyrotaxane comprising a-cyclodextrin and poly(ethylene glycol). The polyrotaxane could be dissolved up to 12 and 10 wt % in a 40 wt % Ca(SCN)(2) aqueous solution and NMMO, respectively. These are the first instances of a neutral aqueous solution and a cyclic amine oxide, respectively, that readily dissolve the polyrotaxane. These new good solvents, as well as other solvents of the polyrotaxane, except for dimethyl sulfoxide, are identical to those of cellulose, indicating that the dissolution mechanism of the polyrotaxane is dominated by intra- and intermolecular hydrogen bonding of the molecule similar to that of cellulose dissolution. The concentrated polyrotaxane solution in a 40 wt % Ca(SCN)(2) aqueous solution showed apparent thixotropy and spontaneous gelation of the solution caused by a gradual increase in its viscosity. (c) 2007 Wiley Periodicals, Inc.
机译：发现硫氰酸钙[Ca（SCN）（2）]水溶液和40％（重量）以上的N-甲基吗啉N-氧化物（NMMO）一水合物可溶解纤维素，它们是包含a-环糊精和聚乙二醇）。聚轮烷可以分别溶解在40％（重量）的Ca（SCN）（2）水溶液和NMMO中至多12和10％（重量）。这些分别是容易溶解聚轮烷的中性水溶液和环状氧化胺的第一种情况。除了二甲基亚砜外，这些新的良溶剂以及聚轮烷的其他溶剂与纤维素的溶剂相同，这表明聚轮烷的溶解机理主要受分子内和分子间氢键作用的支配。纤维素溶解。在40 wt％Ca（SCN）（2）水溶液中的浓缩的聚轮烷溶液显示出明显的触变性和溶液粘度的逐渐增加引起的自发胶凝。 （c）2007年Wiley Periodicals，Inc.

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