Effects of chemical variations on the mesophase behavior of new fluorinated poly(vinylcyclopropane)s
作者:Marina Ragnoli、Elena Pucci、Massimo Bertolucci、Bernard Gallot、Giancarlo Galli
DOI:10.1016/j.jfluchem.2003.07.010
日期:2004.2
Several new structures of fluorinated polymers poly(1)–poly(9) were prepared by free radical ring opening polymerization of vinylcyclopropane monomers 1–9 containing different fluorinated side groups of the type (CH2)n(CF2)pF. While in poly(1)–poly(3) p varied from 6 to 10 for a fixed n=2, in poly(4)–poly(6) n increased from 3 to 5 at the given p=8. In poly(7) and poly(8) a phenyl ring was incorporated
氟化聚合物的几个新的结构聚(1) -聚(9)由乙烯基环丙烷单体的自由基开环聚合制备的1 - 9含有的类型的不同的氟化侧基(CH 2)Ñ(CF 2)p F.在poly(1)–poly(3)中,对于固定的n = 2,p从6变为10 ,而在poly(4)–poly(6)中,在给定的p = 8时,n从3增加到5 。在poly(7)和poly(8)引入苯环以延长介晶侧基(分别为n = 2;p = 6和8),该侧基通过聚(9)中的亚甲基间隔基(m = 11)与聚合物骨架进一步分离。因此,可以评估聚合物结构的各种化学变化对中间相行为的影响。该聚合物实际上是包含1,5-直链和环丁烷环异构体单元的共聚物。无论如何,由于全氟化链的特殊性,它们形成了近晶中间相。通过增加p来提高中间相的顺序和各向同性温度(T i),但是T i随着n的增加而降低。通过插入苯环延伸侧基改善了T i。广角X射线衍射研究阐明了不同近晶