通过甲醇溶剂冻胶纺丝制备水溶温度为5-80℃聚乙烯醇（PVA）水溶纤维，采用X射线衍射、双折射、电子强伸仪等测定了PCA水溶纤维的结晶度、取向度、应力应变曲线。讨论了PVA水溶纤维的结构与力学性能的关系。结果表明：纤维的结晶度和取向度随拉伸倍数的增加而增加，拉伸倍数为16时，纤维力学性能良好，纤维结构均匀，水溶温度范围宽。

methylstyrene.PMS. latex particles in an emulsifier-free emulsion were first synthesized by using 2,29-azobis-2-amidinopropane. dihydrochlorideV-50. as an initiator. Purification of the latexes by dialysis was followed inorder to remove residual monomer, initiator and electrolytes. The cationic polymethylstyrene. latexes were then oxidized in the presence of t-butyl hydroperoxide catalyzed by copper chloride at 608C under air. The degree of oxidation increased with reaction time, but the emulsions of highly oxidized poly methylstyrene. latexes were found to be unstable. An increase of oxidant concentration enhanced the rate of oxidation, while the catalyst concentration had little influence on it. The effect of reaction temperature and pH value on the catalytic oxidation of poly methyl-styrene. latexes was also investigated.

Highly monodispersed emulsifier-free poly(methylstyrene) (PMS) latex particles were prepared via an emulsifier-free emulsion polymerization in the presence of 2,29-azobis-(2-amidineopropane) dihydrochloride (V-50) as an initiator. A combination of kinetics and molecular weight distribution studies revealed that the polymerization followed the micellization nucleation mechanism. Results showed that an appropriate initiator concentration was necessary to obtain monodisperse and stable latex particles. Conversion of methylstyrene was found to increase significantly with increasing initiator concentrations. However, the size of PMS latex particles decreased with both the increase of initiator concentration and the reaction temperature at a constant ionic strength. The particle size was increased as the ionic strength of the aqueous phase increased, yet the variation of ionic strength had little effect on the particle size distribution. SEM micrographs showed that an agitation rate of 350 rpm or higher was required in order to produce highly monodispersed poly(methylstyrene) latex particles.