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研究不同组成配比下的聚甲醛(POM)/聚氧化乙烯(PEO)晶/晶共混体系溶液结晶行为和结晶形态。结果表明:POM和PEO溶于其共同溶剂六氟异丙醇(HFIP),溶剂挥发过程中两组分由于分子链的相互作用,形成不完善结晶,POM在DSC升温曲线中出现熔融双峰,高熔点峰与纯POM熔点峰相同,而低熔点峰则随PEO含量增大而降低。PEO熔点随POM含量增大而降低。偏光显微镜测试表明:当体系中PEO质量含量低于40%时,POM球晶明显,其直径随PEO含量增加而增大,PEO形成碎晶;当PEO质量含量在60%到80%之间,POM先结晶形成较小的球晶,PEO后结晶,并可穿越POM球晶继续生长至布满整个视场。
The crystallization behavior and crystal morphology of poly (formaldehyde) (POM) / poly (ethylene oxide) (PEO) / crystal blends under different compositions were studied. The results showed that POM and PEO were dissolved in HFIP, and the two components were incompletely crystallized due to the interaction of molecular chains during the volatilization of the solvent. The melting peak of POM appeared in DSC curve, The high melting point peak is the same as the pure POM melting point peak, while the low melting point peak is decreasing with increasing PEO content. PEO melting point decreases with increasing POM content. The polarization microscopy results showed that when the content of PEO is less than 40%, the spherulites of POM are obvious. The diameter of PEO increases with the increase of PEO content, and the spherulites of PEO form. When the mass content of PEO is between 60% and 80% POM first crystallized to form smaller spherulites, PEO after crystallization, and can continue to grow through the POM spherulites to cover the entire field of view.