| Effects of Preparation Conditions of Rare Earth Catalyst on Copolymerization of Butadiene and Isoprene |
| Received:September 11, 2017 Revised:October 09, 2017 |
| DOI： |
| Key Words: butadiene；isoprene；Nd（vers）3；Al（i-Bu）3；Al（i-Bu）2Cl；rare earth catalyst；catalyst aging |
| Author Name | Affiliation | E-mail | | Niu Zhongfu* | 青岛科技大学高分子科学与工程学院 | niuzhongfu@qq.com | | Lang Xiurui | 青岛科技大学高分子科学与工程学院 | | | Jiang Bo | 青岛瑞林材料科技有限公司 | |
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| Abstract: |
| Copolymerization of butadiene and isoprene in hexane by solution polymerization was studied with Nd（vers）3-Al（i-Bu）3-Al（i-Bu）2Cl catalytic system.The effects of catalyst preparation conditions such as aging method，aging time，aging temperature，monomer amount and catalyst ratio on the copolymerization of butadiene and isoprene were investigated.The results showed that，butadiene-isoprene random copolymer with high cis-content could be synthesized by Nd/Al/Cl catalytic system，and the catalyst preparation conditions had little effect on the microstructure of butadiene-isoprene copolymers.The mole ratios of cis-1 ，4-structure in polybutadiene and polyisoprene chains were all above 0.96.The addition of a small amount of monomer isoprene in the preparation of catalyst could improve the polymerization activity of the catalyst.The butadiene-isoprene copolymers had high number-average molecular weight（38.8×104～42.1×104）. When the mole ratio of Al/Nd was 15 and the molar ratio of Cl/Nd was 1.5，the yield of butadiene-isoprene copolymer was large，and the molecular weight distribution was the narrowest. |
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