论文部分内容阅读
利用WAXD研究PEKK的晶型，得到两种晶型其点阵常数（nm）为：I型a=0．775,b=0.609，c=101及II型a=0．418，b=1.13，c=1.007;表明多晶型不仅与结晶条件也与分子结构有关改变分子结构，在二氯乙烷中结晶都可将两种晶型完全分开对PEKK低聚物在二氯乙烷中结晶样品的研究证实了上述晶到
The lattice constants (nm) of PEKK were studied by WAXD. The lattice constants (nm) of the two kinds of crystals were as follows: I = 0.775, b = 0.609, c = 101 and a = 0.418, b = c = 1.007; indicating that the polymorphs are not only related to the crystallization conditions but also to the molecular structure to change the molecular structure. Crystallization in dichloroethane can completely separate the two crystalline forms from the crystallization of PEKK oligomers in dichloroethane The study confirmed the above crystal to