Citation: Feng Chen, Bi-wei Qiu, Ya-nan Ye, Yu-hua Lv, Yong-gang Shangguan, Yi-hu Song, Qiang Zheng. Reconstruction of Core-Shell Dispersed Particles in Impact Polypropylene Copolymer during Extrusion[J]. Chinese Journal of Polymer Science, ;2015, 33(4): 633-645. doi: 10.1007/s10118-015-1616-0 shu

Reconstruction of Core-Shell Dispersed Particles in Impact Polypropylene Copolymer during Extrusion

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

Received Date: 12 August 2014
Revised Date: 5 January 2015

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

We reported an approach to reconstruct the complex phase morphology of impact polypropylene copolymer (IPC) with core-shell dispersed particles and to optimize its toughness in approximate shear condition. The molten-state annealing results indicate that the phase structure with core-shell dispersed particles is unstable and could be completely destroyed by static annealing, resulting in the degradation of impact strength. By using a co-rotating twin screw extruder, we found that the dispersed particle with core-shell structure could be rebuilt in appropriate condition with the recovery of excellent impact strength due to both the huge interfacial tension during solidification and the great difference in viscosity of components. Results reveal that almost all the extruded IPCs show the impact strength 60%-90% higher than that of annealed IPCs at room temperature. And the twice-extruded IPC shows the highest impact strength, 446% higher than that of IPC annealed for 30 min. As for low temperature tests, the impact strength of extruded IPCs also increases by 33%-58%. According to adjusting the processing conditions including extrusion speed, extrusion frequency and temperature, an optimization of toughness was well established.
- Impact polypropylene copolymer,
- Shear,
- Phase morphology,
- Core-shell dispersed particle,
- Impact strength
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沈阳化工大学材料科学与工程学院沈阳 110142