Citation: Wang Tao, Guo Haiyang, Meng Hao, Hu Boyang, Hou Yanhui. Preparation of Polypropylene/Montmorillonite Composites by Bifunctional Catalytic System[J]. Chemistry, ;2017, 80(11): 1067-1072. shu

Preparation of Polypropylene/Montmorillonite Composites by Bifunctional Catalytic System

Wang Tao ¹ ,
Guo Haiyang ² ,
Meng Hao ² ,
Hu Boyang ² ,
Hou Yanhui ^2,,

1.
Department of Assets and Equipment, Hebei University of Science and Technology, Shijiazhuang 050018
2.
State Key Laboratory of Separation Membranes and Membrane Processes, School of Material Science and Engineering, Tianjin Polytechnic University, Tianjin 300387

Corresponding author: Hou Yanhui, houyh1977@163.com
Received Date: 17 June 2017
Accepted Date: 4 August 2017

Figures(6)

In order to prepare polypropylene/montmorillonite nanocomposites, the Brookhart type of ethylene oligomerization catalyst was supported on the organic montmorillonite layer, and then mixed with propylene polymerization catalyst (metallocene catalyst) to obtain a kind of bifunctional catalytic system. Using the bifunctional catalytic system, a series of polypropylene/montmorillonite nanocomposites with different structures were synthesized by the copolymerization of olefins/montmorillonite and propylene. The results of gas chromatography (GC) and X-ray diffraction (XRD) showed that the C₄~C₁₆ α-olefins were obtained by montmorillonite-supported iron catalyst, and the montmorillonites were dispersed in the form of lamellar oxygenated product in toluene solution. The effects of montmorillonite supported iron catalyst and copolymerization catalyst on the polymerization of ethylene and the copolymerization of propylene and oligomerization products were investigated. The polypropylene/montmorillonite composites were characterized by XRD, TEM, DSC, NMR, and GPC. The results showed that montmorillonite were uniformly dispersed in the polypropylene matrix in the form of nanosheet stripping. The crystallization temperature of polypropylene/montmorillonite composites was lower than that of polypropylene. The molecular weight of the obtained polypropylene matrix is in the range of 8.1×10⁴ to 17.1×10⁴ g/mol.
- Polypropylene,
- Montmorillonite,
- Composite,
- Bifunctional catalytic system
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