Ordered structure of poly(1H,1H-fluoroalkyl α-fluoroacrylate)s
Ordered structure of poly(1H,1H-fluoroalkyl α-fluoroacrylate)s
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DOI：
10.1021/ma950746v
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发表时间：
1996
期刊：
影响因子：
5.5
通讯作者：
T. Shimizu;Yoshito Y. Tanaka;S. Kutsumizu;S. Yano
中科院分区：
文献类型：
--
作者：
T. Shimizu;Yoshito Y. Tanaka;S. Kutsumizu;S. Yano
通过 X 射线衍射、DSC 和偏振红外光谱测量，对同系聚 (1H,1H-氟烷基 α-氟丙烯酸酯) [-{CH 2 CFC(O)OCH 2 (CF 2 ) n Y} p- , Y = H 或 F, Nc = 1 + n = 2-12] 进行了结构研究。在室温下，使用的所有同系物都具有有序结构（微晶），由主链和氟烷基侧链的有序性组成。微晶的结构取决于氟烷基侧链的长度（N c ）和化学结构。在较短的氟烷基同系物（N c < 7）中，侧链在室温下以双层堆积形式排列，而在较长的氟烷基同系物中，侧链大多以单层堆积形式排列。随着温度升高，在短氟烷基同系物中，双层堆积在Tg以上的温度附近更多地排列，然后逐渐扰乱，而在长氟烷基同系物中，单层堆积在Tg以上转变为双层堆积。从主链和氟烷基侧链的有序程度讨论了层状结构及其随温度的变化。
Structural studies for a homologous series of poly(1H,1H-fluoroalkyl α-fluoroacrylate)s [-{CH 2 CFC(O)OCH 2 (CF 2 ) n Y} p- , Y = H or F, Nc = 1 + n = 2-12] have been performed with X-ray diffraction, DSC, and polarized IR spectral measurements. At room temperature, all the homologues used have an ordered structure (crystallites) which consists of the ordering of main and fluoroalkyl side chains. The structure of crystallites depended on both length (N c ) of fluoroalkyl side chains and chemical structure. In the shorter fluoroalkyl homologues (N c < 7), the side chains are arranged in a double-layer packing at room temperature, while they are mostly in a single-layer packing in the longer fluoroalkyl homologues. As temperature increased, in the short fluoroalkyl homologues, the double-layer packing was more arranged around a temperature above T g and then gradually disturbed, while in the long fluoroalkyl homologues, the single layer packing transformed into a double-layer packing above T g . The layered structure and its change with temperature were discussed from the degree of orderings of the main backbone chains and the fluoroalkyl side chains.