聚烯烃/聚氧化乙烯共混体系结晶与熔化行为研究

研究了HDPE/PEO,LDPE/PEO,PP/PEO共混体系的非等温结晶与熔化行为。PEO熔体对HDPE,LDPE,PP的结晶与熔化行为几乎没有影响,而已经结晶了的HDPE,LDPE,PP对处于分散相PEO的结晶与熔化行为则有一定影响,影响程度HDPE最大,LDPE次之,PP最小。这些不相容结晶/结晶共混体系的形态结构取决于低熔点组分处于连续相或分散相、高熔点组分生成的球晶大小、多少及其分布。

Crystallization and Melting Behavior of Polyolefine Blends with Poly (ethylene oxide)

Morphology, crystallization and melting behavior of high density polyethylene (HDPE)/poly(ethylene oxide) (PEO), low density polyethylene (LDPE)/PEO and polypropylene (PP) / PEO blends were studied by means of differential scanning calorimetry, polarizing microscope and small angle light scattering. Calorimetric analysis shows that PEO in its molten state does not affect the crystallization behavior of HDPE, LDPE and PP while the crystallized HDPE, LDPE or PP does affect the crystallization of PEO in the dispersed phase to some extent. The morphological structure of polyolefine / PEO blends depends upon the phase of PEO whereabouts as well as the spherullte size, amount and distribution of HDPE, LDPE and PP .