The functions of crystallizable ethylene‐propylene copolymers in the formation of multiple phase morphology of high impact polypropylene
The functions of crystallizable ethylene‐propylene copolymers in the formation of multiple phase morphology of high impact polypropylene
复制标题
DOI：
10.1002/app.34609
复制
发表时间：
2012-02
影响因子：
3
通讯作者：
Cuiyan Tong;Yang Lan;Ye Chen;Yong Chen;Decai Yang;Xiaoniu Yang
中科院分区：
文献类型：
--
作者：
Cuiyan Tong;Yang Lan;Ye Chen;Yong Chen;Decai Yang;Xiaoniu Yang
采用溶剂萃取分馏、透射电子显微镜、选区电子衍射、核磁共振和选择性共混等方法，研究了结晶乙丙共聚物在高抗冲聚丙烯(HIPP)多相形态形成中的作用。结果表明，HIPP除了含有聚丙烯(PP)和无定形乙丙橡胶(EPR)以及少量的聚乙烯(PE)外，还含有一系列可结晶的乙丙共聚物。可结晶的乙丙共聚物可进一步分为短序列长度的PE和PP链段的乙烯-丙烯嵌段共聚物(PE-S-PP)和长序列长度的PE和PP嵌段共聚物(PE-b-PP)。PE-S-PP和PE-b-PP对HIPP分散相多层核-壳结构的形成有不同程度的参与。PE-S-PP(与PE类似)形成内核，PE-b-PP形成外壳，中间层由EPR形成。结晶性乙烯-丙烯共聚物性能不同的主要原因是它们与PP基质的相容性不同。(C)2011 Wiley期刊公司J Appl Polym Sci 123：1302-1309,2012
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 (C-13-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. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 123: 1302-1309, 2012