青岛科技大学  English 
王兆波
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教授 硕士生导师  

教师拼音名称:wangzhaobo

学位:工学博士

职称:教授

学科:

材料物理与化学

材料学

材料加工工程

材料科学与工程其他专业

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2019-09-15 山东省优秀教师

2019-05-16 山东省优秀研究生指导教师

2020-12-10 青岛市高校教学名师

2019-09-04 青岛市教书育人楷模

2019-09-15 青岛市新时代最美劳动者

2020-11-10 山东省大学生高分子实用技术大赛“优秀指导教师”

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Effect of electronegativity and steric hindrance of the cocatalyst on the activity and selectivity of butadiene polymerization catalyzed by molybdenum

关键字:differential scanning calorimetry (DSC); glass transition; synthesis and processing techniques

摘要:Molybdenum-based random 1,2-polybutadiene (1,2-PB) rubber, with its excellent wet skid resistance, low rolling resistance, and low heat buildup, can be used for green tread rubber, and it has significant benefits for the enhancement of the mechanical strength of 1,2-PB. In this study, we investigated in detail the effects of the electronegativity and steric hindrance of the cocatalyst on the stereoselectivity of the resulting polymers. In the case of cocatalysts with moderate electronegativities, the active centers were more stable; this resulted in a larger molecular weight and a higher conversion, whereas a cocatalyst with excessive electronegativity tended to initiate cationic polymerization. The high sterically hindered substituent restricted the coordination configuration of the monomer; this ultimately resulted in the increase in the 1,2 structure to 90%. Fourier transform infrared analysis showed that the content of trans-1,4 structure increased from 7 to 66%, and its crystallinity reached 59.2%, as calculated with differential scanning calorimetry when triethyl aluminum was used as the cocatalyst. Consequently, trans-1,4-polybutadiene crystals were introduced into the 1,2-PB elastomer in one step; this could be a promising facile route for strengthening 1,2-PB.

卷号:136

期号:1

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