Morphology and mechanical properties in the binary blends of isotactic polypropylene and novel propylene-co-olefin random copolymers with isotactic propylene sequence 1. Ethylene–propylene copolymers
Morphology and mechanical properties in the binary blends of isotactic polypropylene and novel propylene-co-olefin random copolymers with isotactic propylene sequence 1. Ethylene–propylene copolymers
复制标题
DOI：
10.1016/j.polymer.2004.11.033
复制
发表时间：
2005-01
期刊：
影响因子：
4.6
通讯作者：
K. Nitta;Yong-Woo Shin;H. Hashiguchi;S. Tanimoto;M. Terano
中科院分区：
文献类型：
--
作者：
K. Nitta;Yong-Woo Shin;H. Hashiguchi;S. Tanimoto;M. Terano
采用偏光显微镜、透射电镜、动态力学分析和拉伸性能研究了新型高等规丙烯序无规乙烯（EP）共聚物对等规聚丙烯（iPP）形貌和力学性能的加性效应。结果表明，丙烯含量大于84mol%的EP共聚物可与iPP相混溶，其中可结晶的PP序列被纳入iPP的晶格中，EP链上的其他部分被排除在非晶相中。因此，它们作为连接相邻薄片的纽带分子，导致iPP屈服韧性的增强。另一方面，丙烯单元含量小于77mol%的EP共聚物与iPP不相容。iPP/EP共混物呈现相分离形态。
The additive effects of the novel ethylene–propylene random (EP) copolymers with high isotacticity in propylene sequence on the morphology and mechanical properties of isotactic polypropylene (iPP) were investigated using polarized optical microscopy, transmission electron microscopy, dynamic mechanical analysis and tensile behavior. According to these results, the EP copolymers with a propylene content of more than 84mol% were miscible with iPP, in which the crystallizable PP sequences in these EP copolymers were incorporated in crystal lattice of iPP and the other portions in the EP chains were excluded to the amorphous phases. Consequently, they act as tie molecules linking between adjacent lamellae, leading to enhancement of yield toughness of iPP. On the other hand, the EP copolymers with a propylene-unit content of less than 77mol% were incompatible with iPP. The iPP/EP blends showed the phase-separated morphology.