Citation: Bi-wei Qiu, Feng Chen, Yong-gang Shangguan, Yu Lin, Qiang Zheng. Effects of Composition on Microstructure and Crystallization Behavior for Impact Polypropylene Copolymer Investigated by Restructuring the Complex Core-Shell Dispersed Particles in Ternary Blends[J]. Chinese Journal of Polymer Science, ;2015, 33(1): 95-108. doi: 10.1007/s10118-015-1556-8 shu

Effects of Composition on Microstructure and Crystallization Behavior for Impact Polypropylene Copolymer Investigated by Restructuring the Complex Core-Shell Dispersed Particles in Ternary Blends

1.
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China

Received Date: 3 April 2014
Revised Date: 2 July 2014

Fund Project: This work was financially supported by the National Natural Science Foundation of China (Nos. 51173157 and 51173165), the Fundamental Research Funds for the Central Universities (No. 2013QNA4048) and Nature Science Foundation of Zhejiang Province (No. Y4100314).

A series of ternary blends of polypropylene/ethylene-propylene random copolymer/ethylene-propylene segmented copolymer (HPP/EPR/EbP) whose microstructures are similar to those of impact polypropylene copolymer (IPC) were prepared in order to systematically investigate the effects of composition on microstructure and crystallization behavior of IPC. The observation of primary phase morphology reveals that the dispersed phase with core-shell structure could be rebuilt in certain composition and excessive EPR leads to a bicontinuous phase structure in ternary blends. After undergoing same quiescent crystallization including isothermal and non-isothermal crystallization, these blend samples exhibit special composition-dependent melting behavior, i.e., the melting point increases markedly with the increase of EPR content until it turns down at a critical content (about 30 wt%). The crystallization behavior is mainly ascribed to the different nucleation abilities. It is suggested that although the compatibility between EPR and HPP components becomes worse with the increase of EPR content due to the increased interfacial area and the decreased concentration of EbP, higher EPR content in the blend facilitates to heterogeneous nucleation except for the appearance of obvious bicontinuous phase structure.
- Core-shell dispersed phase,
- Microstrcture,
- Crystallization,
- Nucleation
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沈阳化工大学材料科学与工程学院沈阳 110142