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Citation: HOU Shan, ZHANG Chunyu, CHEN Bin, ZHANG Xuequan. Properties and Microscopic Morphology of Polypropylene In-reactor Alloy[J]. Chinese Journal of Applied Chemistry, ;2012, 29(1): 18-22. doi: 10.3724/SP.J.1095.2012.00029 shu

Properties and Microscopic Morphology of Polypropylene In-reactor Alloy

HOU Shan ^a ,
ZHANG Chunyu ^b,, ,
CHEN Bin ^a,, ,
ZHANG Xuequan ^b

1.
a School of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China;
2.
b State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Corresponding author: ZHANG Chunyu, CHEN Bin,
Received Date: 14 January 2011
Available Online: 11 April 2011
Fund Project: 国家863计划(2006AA03Z551)资助项目 (2006AA03Z551)

A series of high melt flow index(MFI) polypropylene(PP) in-reactor alloys with different contents of hexane soluble fraction was prepared by bulk-gas phase polymerization process using spherical Ziegler-Natta catalyst(phosphate as internal electron donor).The mechanical properties and microcosmic morphology of the obtained PP in-reactor alloys were investigated.It was found that the impact strength increased with the increase of hexane soluble fraction.Impact strength increased from 4.4 kJ/m² to 52.7 kJ/m².While the flexure strength and tensile strength slightly decreased,tensile strength decreased from 28.6 MPa to 19.5 MPa,the flexure strength decreased from 37.2 MPa to 21.5 MPa.According to the micrographs of FESEM,the ethylene-propylene rubber(EPR) phase was evenly dispersed in PP matrix and formed "core-shell" structure.
- polypropylene in-reactor alloy,
- bulk-gas phase polymerization,
- Ziegler-Natta catalyst,
- core-shell structure
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