Citation: Meng-jia Zhang, Li Wang, Liu-ting Hong, Ya-wei Qin, Jin-yong Dong. Particle Morphology Control of Polypropylene Heterophasic Copolymer at Increased EPR Content by Simultaneous Cross-linking[J]. Acta Polymerica Sinica, ;2020, 51(2): 166-173. doi: 10.11777/j.issn1000-3304.2019.19115 shu

Particle Morphology Control of Polypropylene Heterophasic Copolymer at Increased EPR Content by Simultaneous Cross-linking

Meng-jia Zhang ^1,2 ,
Li Wang ³ ,
Liu-ting Hong ³ ,
Ya-wei Qin ^1,2 ,
Jin-yong Dong ^1,2,,

1.
CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190
2.
University of Chinese Academy of Sciences, Beijing 100049
3.
Institute for Petrochemical Research, PetroChina Company Limited, Beijing 102206

Corresponding author: Jin-yong Dong, jydong@iccas.ac.cn
Received Date: 10 June 2019
Revised Date: 9 July 2019

Heterophasic copolymerization of propylene based on MgCl₂-supported Ziegler-Natta catalysts, that is, sequential propylene homopolymerization or copolymerization with minor amount of ethylene followed by ethylene/propylene random copolymerization for EPR, is a major polymerization technique in polypropylene industry, whose products, depending on their EPR contents, include high impact PP (hiPP, where EPR weight fraction is normally less than 40%) and thermophastic olefin elastomer (TPO, where EPR weight fraction is higher than 50 wt%). Compared to hiPP, the production of TPO is rather more challenging, for increased EPR contents makes it very difficult to prevent EPR from overflowing to the surfaces of the polymer particle, which will mess up with the particle morphology and lead to serious reactor fouling issues, affecting the production continuity. How to control the particle morphology at increased EPR contents with EPR being authentically contained inside without contaminating the surfaces has become a key scientific issue in further developing heterophasic copolymerization of propylene to TPO. This paper reports that the solution may lie in a simultaneous cross-linking of EPR using nonconjugated α,ω-diolefin during its polymerization. It is shown that simultaneous cross-linking can alter EPR’s viscoleastic properties to a great extent, exponentially increasing its low-shear viscosity and elasticity. As a result, EPR no longer poses as aggregated volatile droplets but rather large-size phase domains are formed by hot-compression; instead, it features dispersed particles discrete to each other. In turn, no overflowing of EPR occurs to the polymer particle surfaces. This research provides a solution for heterophasic copolymerization of propylene and polypropylene thermoplastic elastomer with high EPR content.
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