双金属催化剂用于 styrene 的同聚合和乙烯-styrene 的共聚合. 特殊的共同分子选择性和插入区域化学
Neng Guo1, Liting Li, Tobin J Marks
1Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, USA.
一种新型的双金属催化剂 (Ti2) 在烯同聚合和高效的乙烯-烯共聚合中表现出高活性. 这种单位催化剂能够广泛控制共聚合物中的 styrene 组成.
科学领域:
- 聚合物化学 聚合物化学
- 有机金属化学 有机金属化学
- 催化剂是一种催化剂.
背景情况:
- 约束几何学催化剂 (CGCs) 在烯聚合过程中至关重要.
- 调节催化剂结构可以显著影响聚合行为和聚合物特性.
研究的目的:
- 为了研究一种新的双金属受约束几何学催化剂 (Ti2) 的styrene同聚合和乙烯-styrene共聚合.
- 为了比较Ti2与其单核类似物 (Ti1) 的性能.
主要方法:
- 合成和描述双金属催化剂Ti2. 的特征.
- styrene 的同聚合和乙烯-styrene 的共聚合实验.
- 13C 核磁共振光谱用于微观结构分析.
- 开始阶段调查的终端组分析.
主要成果:
- 与Ti1.1相比,Ti2在 styrene 同聚合过程中表现出明显更高的活性 (50倍) .
- Ti2 在广泛的士成分范围内 (0-76%) 实现了高效的乙烯-士共聚合.
- 由Ti2产生的共聚物体显示了长度大于2个单位的链式 styrene 序列.
- 烯与Ti2的同聚合表明约50%的1,2-区域化学在启动步骤.
结论:
- Ti2的双金属结构是其增强的催化活性和独特的微观结构控制的原因.
- Ti2代表了单位催化技术的突破,既用于 styrene 的同聚合,也用于 ethylene-styrene 的共聚合.
- 这种催化剂可以精确控制共聚合物组成和微观结构,为聚合物设计打开新的道路.
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