Preparation of Long-Chain Branched Polyethylene Catalyzed by Tandem Catalytic System

doi:10.19894/j.issn.1000-0518.200170

Chinese Journal of Applied Chemistry ›› 2021, Vol. 38 ›› Issue (1): 69-76.DOI: 10.19894/j.issn.1000-0518.200170

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Preparation of Long-Chain Branched Polyethylene Catalyzed by Tandem Catalytic System

LU Ling-Pan¹, WU Jia-Jun², WANG Kai-Ti^2*

¹School of Pharmacy and Chemical Engineering, Zhengzhou University of Industrial Technology, Zhengzhou 451199, China;
²School of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China

Received:2020-06-05 Revised:2020-08-13 Published:2021-01-01 Online:2021-02-01
Supported by:
National Natural Science Foundation of China (No.21801033) and the Innovation Research Group at Institutions of Higher Education in Chongqing (No.CXQT19027)

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Abstract

Abstract: Two tandem catalytic systems, Cat.I/Cat.II {Cat.I:[ArNCH-C₈H₃(CH₂)₂(C₆H₅)O]₂ZrBn₂; Cat.II:(η⁵-C₅Me₄)Si(Me)₂N^tBuTiCl₂} and Cat.I/Cat.III (Cat.III:tans-Et(Ind)₂ZrCl₂), were employed respectively to prepare long chain branched polyethylene (LCBPE) by using ethylene as the sole monomer. Ethylene is initially acted upon by Cat.I to give ethylene oligomers with terminal vinyl groups. Subsequently, the copolymerization of the resultant oligomers with ethylene is promoted by Cat.II and Cat.III respectively and affords long chain branched polyethylene (LCBPE). By varying the molar ratio of Cat.I/Cat.II as well as Cat.I/Cat.III, a series of LCBPEs with controllable branching molar fraction (0.84%~3.95%) was prepared successfully. All of these obtained polymers exhibits a unimodal distribution, indicating that all of the obtained polymers are pure LCBPEs rather than the blends of ethylene oligomers and linear PE. The LCBPEs show lower crystallinity than the linear PE. Because of the entanglement of the long chain branches, the resultant LCBPEs show more obvious shear-thinning phenomenon and higher elongation. However, the lower crystallinity of the LCBPEs results in lower tensile strength.

Key words: Tandem catalytic system, Olefin polymerization, Polymerization of ethylene, Long chain branched polyethylene

CLC Number:

O632

LU Ling-Pan, WU Jia-Jun, WANG Kai-Ti. Preparation of Long-Chain Branched Polyethylene Catalyzed by Tandem Catalytic System[J]. Chinese Journal of Applied Chemistry, 2021, 38(1): 69-76.

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Preparation of Long-Chain Branched Polyethylene Catalyzed by Tandem Catalytic System

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