聚环氧乙烷/聚乙基■唑啉共混体系结晶行为及相容性的研究

用偏光显微镜（ＰＬＭ）、ＤＳＣ、ＩＲ和ＷＡＸＤ等测试方法对聚环氧乙烷（ＰＥＯ）／聚乙基唑啉（ＰＥＯｘ）共混体系结晶行为及相容性进行了研究．结果表明，ＰＥＯ含量在３０％以上的共混体系中，几乎完全被球晶充满，非晶态ＰＥＯｘ作为微区分散在大球晶之间或之中；含量为２０％的共混体系照片上呈树枝状晶；含量低于１０％时则看不到结晶出现，体系形成单一的非晶相．对任何组成的共混物，均只出现单一的玻璃化转变温度（Ｔｇ），而且符合Ｆｏｘ方程揭示的规律；随ＰＥＯｘ组分含量的增加，共混体系的结晶度减小，熔点下降，并利用平衡熔点方程计算出ＰＥＯ与ＰＥＯｘ的相互作用能密度．非晶ＰＥＯ与ＰＥＯｘ热力学相容，其相容性是由于这两种分子间存在着特殊相互作用．ＰＥＯｘ的加入不会改变ＰＥＯ的晶胞参数．

STUDIES ON CRYSTALLIZATION BEHAVIOR AND COMPATIBILITY OF POLY(ETHYLENE OXIDE)(PEO)/ POLY(2 ETHYL 2 OXAZOLINE)(PEOx) Blends

PLM,DSC,IR and WAXD have been used to investigate the morphology,crystallinity, T g ,intermolecular interaction and compatibility of PEO/PEOx blends as a function of composition. Up to a content of 30wt% of PEO,the blends are completely filled with PEO spherulites,no separated domains of PEOx being observed. The blend with 20wt% PEO shows a twig like morphology and blends with lower than 10wt% show no evidence of crystallinity. Blends with different compositions show a single glass transition temperature ( T g) ,which corresponds to the calculated value by the Fox's equation. With increased PEOx content,degree of crystallinity and melting point of the blends decrease. The interaction energy density (B) between PEO and PEOx has been estimated by equation describing the equilibrium melting point. The results show that PEOx is compatible with noncrystalline PEO,as caused by specific intermolecular interaction between PEO and PEOx.