期刊
CHINESE JOURNAL OF POLYMER SCIENCE
卷 29, 期 4, 页码 475-482出版社
SPRINGER
DOI: 10.1007/s10118-011-1048-4
关键词
Ziegler-Natta polymerization; Vanadium/titanium catalyst; Ethylene-propylene copolymer
资金
- Program for New Century Excellent Talents in Universities [NCET-07-0142]
- Program for New Century Excellent Talents in Heilongjiang Provincial Universities [NCET-06-010]
- National Natural Science Foundation of China [20972025]
- Science Foundation of Tianjin University of Science Technology [20090420]
Magnesium chloride supported vanadium/titanium bimetallic Ziegler-Natta catalysts with di-i-butyl phthalate as internal donor for copolymerization of ethylene and propylene were prepared. The effects of reaction temperature, ethylene/propylene molar ratio, aluminium/vanadium (Al/V) molar ratio and titanium/vanadium molar ratio on the catalytic activity were investigated. The molecular weight, molecular weight distribution, sequence composition and crystallinity of the products were measured by gel permeation chromatography, C-13-NMR and differential scanning calorimetry analysis, respectively. In comparison to the vanadium and titanium catalysts, the bimetallic catalyst showed higher catalytic activity and better copolymerization performance. The obtained ethylene/propylene copolymers have high molecular weight (10(5)), broad molecular weight distribution, high propylene content with random or short blocked sequence structures (r (E) r (P) = 1.919), low melting temperatures and low crystallinities (X (c) < 20%).
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