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采用偏光显微镜和透射电镜研究了 PS-b-PEO-b-PS三嵌段共聚物的结晶形态和微相分离 ,重点讨论了 PEO含量和分子量的影响。实验发现 ,当共聚物中的 PEO分子量低至 60 0 0、含量低至 4 2 %时 ,均有球晶生成 ,且随着 PEO含量的升高 ,球晶形态变得更加完善。 TEM结果显示 ,当 PEO分子量为1 0 0 0 0、含量分别为 93%和 91 %时 ,形成以 PEO为连续相、PS为分散相的微相分离结构 ;但当 PEO含量降低到 77%时 ,发生了相反转 ,PEO变为分散相 ,PS变为连续相。当 PEO分子量为 60 0 0 ,含量为 4 2 %时 ,形成了以 PS为连续相、PEO为分散相的微相分离结构。所有的分散相都有球形或近似球形的形貌。在 PEO的分子量为 2 0 0 0、含量为 1 8%、34 %时 ,发现了层状微相分离结构。同时我们还发现 ,p H=6.0的磷钨酸水溶液是该类嵌段共聚物的有效染色体系
The morphology and microphase separation of PS-b-PEO-b-PS triblock copolymers were investigated by polarized light microscopy and transmission electron microscopy. The effects of PEO content and molecular weight were discussed. It was found that when the molecular weight of PEO in the copolymer was as low as 60% and the content was as low as 42%, spherulites were formed. With the increase of PEO content, the morphology of spherulites became more perfect. TEM results showed that when the molecular weight of PEO was 100% and the content of PEO was 93% and 91% respectively, the micro-phase separation structure with PEO as continuous phase and PS as dispersed phase was formed. However, when the content of PEO decreased to 77% , The opposite occurs, PEO becomes dispersed phase, PS becomes continuous phase. When the molecular weight of PEO is 60% and the content is 42%, the microphase separation structure with PS as continuous phase and PEO as dispersed phase is formed. All dispersed phases have a spherical or nearly spherical morphology. In the PEO molecular weight of 2000, content of 18%, 34%, found that the layered micro-phase separation structure. We also found that an aqueous solution of phosphotungstic acid with p H = 6.0 is an effective dyeing system for such block copolymers