Change with Temperature in Crystal Structures of Nylons 6, 66 and 610
Change with Temperature in Crystal Structures of Nylons 6, 66 and 610
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DOI：
10.1143/jjap.15.2295
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发表时间：
1976-12
影响因子：
1.5
通讯作者：
T. Itoh
中科院分区：
文献类型：
--
作者：
T. Itoh
红外吸收和x射线分析结果证实，尼龙6、66和610晶体区域相邻酰胺基之间的氢键没有断裂，但在低于各自熔点的整个温度范围内，酰胺基在分子中的运动受到很大限制。在约20、80、120、160、200和240℃时测定了三种聚酰胺的晶格参数。推导出尼龙66和610的a轴或氢键长度变化不大，但沿b轴的大热膨胀导致尼龙66和610的（100）和（010）间距反转。均匀聚酰胺和均匀聚酰胺在熔点和结构变化行为上的差异是由于ch2片段旋转的难易程度。
It is verified from the results of infrared absorption and X-ray analyses that the hydrogen bonds between the adjacent amide groups in crystalline regions of nylons 6, 66 and 610 are not broken but the motion of amide groups in a molecule is rather restricted in the whole temperature range below respective melting points. All lattice parameters of three polyamides are determined at about 20, 80, 120, 160, 200 and 240°C. It is deduced that the length of a-axis or hydrogen bond varies little, but the large thermal expansion along b-axis causes inversion of (100) and (010) spacings for nylons 66 and 610. The difference in the melting point and in the behavior of the structure change between even polyamide and even-even one is attributed to the degree of ease with which the CH2-segment is rotated.