Crystal structures in polyamides made from ω‐amino acids
Crystal structures in polyamides made from ω‐amino acids
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由 ω-氨基酸制成的聚酰胺的晶体结构
DOI：
10.1002/pol.1959.1203613020
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发表时间：
1959
影响因子：
3.4
通讯作者：
W. Slichter
中科院分区：
文献类型：
--
作者：
W. Slichter
本文用X射线衍射法研究了几种由ω-氨基羧酸合成的聚酰胺的室温晶体结构。以前的工作者只报道了该系列中两个成员的结构，聚己酰胺（尼龙6）和聚十一酰胺（尼龙11）。发现氨基酸聚合物分为两大类。由含有奇数个碳原子的单体制成的那些使人想起在偶-偶二胺-二酸聚酰胺中发现的三斜晶结构。由具有偶数个碳原子的氨基酸制成的那些化合物使人想起奇-奇二胺-二酸聚合物的六边形结构。显然，对一种晶型的偏好在很大程度上取决于相邻链上酰胺基团之间的偶联细节。在微晶中发现的分子排列显然在熔体中发生到重要的程度。模型的分子排列进行了讨论。聚己酰胺，迄今为止研究最广泛的成员的系列，似乎是异常的晶体结构。
The crystal structures of several polyamides made from ω-aminocarboxylic acids have been studied at room temperature by x-ray diffraction. Previous workers have reported structures for only two members of the series, polycaproamide (nylon 6) and polyundecamide (nylon 11). It is found that the amino acid polymers fall into two main groups. Those which are made from monomers containing an odd number of carbon atoms are reminiscent of the triclinic structures found with the even-even diamine-dioic acid polyamides. Those which are made from amino acids having an even number of carbon atoms recall the hexagonal structures of the odd-odd diamine-dioic acid polymers. Evidently the preference for one crystal form over the other depends largely upon details of the coupling between amide groups on neighboring chains. The molecular arrays found in crystallites apparently occur to an important degree in the melt. Models for the molecular arrangements are discussed. Polycaproamide, hitherto the most widely studied member of the series, appears to be anomalous in its crystal structure.