Citation: Ling-Pan LU, Jia-Jun WU, Kai-Ti WANG. Preparation of Long-Chain Branched Polyethylene Catalyzed by Tandem Catalytic System[J]. Chinese Journal of Applied Chemistry, ;2021, 38(1): 69-76. doi: 10.19894/j.issn.1000-0518.200170 shu

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

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

Corresponding author: Kai-Ti WANG, ktwang@cqut.edu.cn
Received Date: 5 June 2020
Accepted Date: 13 August 2020

Fund Project: the National Natural Science Foundation of China 21801033the Innovation Research Group at Institutions of Higher Education in Chongqing CXQT19027

Figures(6)

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.
- Tandem catalytic system,
- Olefin polymerization,
- Polymerization of ethylene,
- Long chain branched polyethylene
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com