论文成果
Selectivity diversity for a single cobalt(II) precatalyst mediated butadiene polymerization
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关键字:synthetic rubber
摘要:Selectivity diversity from a single catalyst not only allows for facile switch the type of product, but also helps to understand the reaction mechanism by simply varying the reaction conditions. In this research, we disclosed the capability of diversified selectivity of a cobalt complex as precatalyst to mediated 1,3-butadiene, which could produce different structures polymers under different conditions. On direct activation by EASC or MAO, such a complex was able to reveal high cis-1,4- selectivity, giving polybutadiene (PB) products with extremely low glass transition temperature; introducing PPh3 as external donor to such a system, the selectivity could switch from cis-1,4- to highly 1,2- manner, giving atactic 1,2- PBs. Moreover, the 1,2- contents of the obtained polymers were proportionally dependent on the PPh3 equivalents, gradual increasing PPh3/Co ratio was able to access cis-1,4-ran-1,2- products with gradual increased 1,2-contents. In contrast, selecting CS2 as donor could give high syndiotactic 1,2-PB products, which demonstrated melting temperatures up to 203.9 °C. Possible mechanism for such a selectivity diversity was proposed.
卷号:176
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张春雨

教授 博士生导师 硕士生导师

教师拼音名称:zhangchunyu

出生日期:1978-11-30

电子邮箱:

入职时间:2019-11-28

所在单位:先进橡胶材料教育部重点实验室

学历:博士研究生

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性别:男

联系方式:13844852208

学位:理学博士

毕业院校:吉林大学

所属院系:先进橡胶材料教育部重点实验室

学科:材料科学与工程其他专业
高分子化学与物理

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