在乙烯-乙烯共聚化中的最后一项效果以及发现具有高活性乙烯-乙烯催化剂的发现,其乙烯反应性增加
Daniel J Arriola1, Marilyn Bokota, Richard E Campbell
1Corporate R&D, The Dow Chemical Company, 1776 Building, Midland, Michigan 48674, USA.
乙烯和烯共聚合的新催化剂显示出高效率和烯在高温下被纳入. 这些进展对于开发先进的乙 styrene 树脂至关重要.
科学领域:
- 聚合物化学 聚合物化学
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
背景情况:
- 乙烯-乙烯共聚物是有价值的材料.
- 为它们的合成开发高效的催化剂是一个持续的挑战.
- 现有的催化剂经常在更高的温度下难以将 styrene 结合起来.
研究的目的:
- 为了确定以乙烯-氨酸共聚合的商业相关催化剂.
- 了解影响 styrene 结合的动力因素.
- 在受约束几何学催化剂中增强 styrene 的反应性.
主要方法:
- 使用特定的受约束几何学催化剂 (1) 进行乙烯-乙烯共聚的动态分析.
- 设计和合成新的受约束几何学催化剂 (2和3),含有芳香成分.
- 在聚合条件下评估催化剂性能.
- 对新催化剂的X射线晶体结构分析.
主要成果:
- 确定了一种显著的 styrene 前最后一个单体效应,改善了 styrene 的反应性.
- 开发了两种新的催化剂 (2和3),其中包括增强的 styrene (21.5%和30.6%).
- 催化剂3显示出出色的聚合特性,使其成为商业生产的候选者.
结论:
- 约束几何学催化剂在活性部位附近含有芳香替代剂,可显著增强 styrene 的反应性.
- 催化剂3显示出通过溶液工艺生产乙 styrene 树脂的商业潜力.
- 这些发现推动了烯共聚合催化学领域的发展.
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