Fabrication and structural analysis of polyrotaxane fibers and films
Fabrication and structural analysis of polyrotaxane fibers and films
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聚轮烷纤维和薄膜的制备及结构分析
DOI：
10.1088/0953-8984/23/28/284108
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
Yasuhiro Sakai
中科院分区：
文献类型：
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作者：
山崎吉之;井上謙一;仁平友子;遠藤歩;島田隆;望月秀樹;水野美邦;高田昌彦;Yasuhiro Sakai
聚轮烷（PR）是拓扑超分子结构的典型例子，由多个连接到线性聚合物主链上的环状分子组成，并用大端基封端。聚乙二醇和α-环糊精（α-CD）的PR系统因其合成简便、分子结构独特以及在各种智能材料中的潜在应用而受到广泛研究。我们之前已经演示了通过 PR 溶液湿纺来制造无化学交联的 PR 基纤维。在本文中，我们研究了PR纤维中α-CD的晶体结构以及拉伸对其的影响。研究发现PR纤维中的α-CDs形成六边形通道型结构。由于 α-CD 分子沿着聚合物主链滑动，拉伸过程促进了 α-CD 在 c 轴上堆积排列的形成。此外，我们还演示了具有与纤维相似的网络结构和乙二醇低聚物作为增塑剂的弹性PR薄膜的制备。
Polyrotaxane (PR), a typical example of topological supramolecular architecture, consists of multiple cyclic molecules threaded onto a linear polymer backbone and capped with bulky end-groups. The PR system of polyethylene glycol and α-cyclodextrin (α-CD) has been extensively studied for its facile synthesis, unique molecular structure, and possible applications for various smart materials. We have previously demonstrated the fabrication of PR-based fibers without chemical cross-links by wet spinning of PR solution. In this paper, we investigate the crystal structure of α-CDs in PR fibers and the effect of drawing on it. The α-CDs in PR fiber are found to form hexagonal channel-type structure. The drawing process promotes formation of the packing arrangement of α-CDs in the c-axis because of the sliding of α-CD molecules along the polymer backbone. In addition, we demonstrate the preparation of an elastomeric PR film having similar network structure to the fibers and ethylene glycol oligomer as plasticizer.