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The functions of crystallizable ethylene-propylene copolymers in the formation of multiple phase morphology of high impact polypropylene

机译:可结晶乙烯-丙烯共聚物在高冲击聚丙烯多相形态形成中的功能

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The functions of crystallizable ethylene-propylene copolymers in the formation of multiple phase morphology of high impact polypropylene (hiPP) were studied by solvent extraction fractionation, transmission electron microscopy (TEM), selected area electron diffraction (SAED), nuclear magnetic resonance (~(13)C-NMR), and selected reblending of different fractions of hiPP. The results indicate that hiPP contains, in addition to polypropylene (PP) and amorphous ethylene-propylene random copolymer (EPR) as well as a small amount of polyethylene (PE), a series of crystallizable ethylene-propylene copolymers. The crystallizable ethylene-propylene copolymers can be further divided into ethylene-propylene segmented copolymer (PE-s-PP) with a short sequence length of PE and PP segments, and ethylene-propylene block copolymer (PE-b-PP) with a long sequence length of PE and PP blocks. PE-s-PP and PE-b-PP participate differently in the formation of multilayered core-shell structure of the dispersed phase in hiPP. PE-s-PP (like PE) constructs inner core, PE-b-PP forms outer shell, while intermediate layer is resulted from EPR. The main reason of the different functions of the crystallizable ethylene-propylene copolymers is due to their different compatibility with the PP matrix.
机译:通过溶剂萃取分离,透射电子显微镜(TEM),选择区电子衍射(SAED),核磁共振(〜(),)研究了可结晶的乙烯-丙烯共聚物在高冲击聚丙烯(hiPP)的多相形态形成中的功能。 13)C-NMR),并选择不同部分hiPP的重掺合。结果表明,hiPP除包含聚丙烯(PP)和无定形乙烯-丙烯无规共聚物(EPR)以及少量聚乙烯(PE)外,还包含一系列可结晶的乙烯-丙烯共聚物。可结晶的乙烯-丙烯共聚物可以进一步分为具有短的PE和PP链段长度的乙烯-丙烯嵌段共聚物(PE-s-PP)和具有长的乙烯-丙烯嵌段共聚物(PE-b-PP)。 PE和PP块的序列长度。 PE-s-PP和PE-b-PP在hiPP中参与分散相的多层核-壳结构的形成不同。 PE-s-PP(如PE)构成内核,PE-b-PP构成外壳,而中间层则由EPR形成。可结晶的乙烯-丙烯共聚物的不同功能的主要原因是由于它们与PP基体的相容性不同。

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