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Synthesis and Characterization of Supramolecular Colloids
Published on: April 22, 2016
乳化物的受控和立体选择性聚合:动力学,选择性和微观结构
Zhiyuan Zhong1, Pieter J Dijkstra, Jan Feijen
1Department of Polymer Chemistry and Biomaterials and Institute for Biomedical Technology, Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
Journal of the American Chemical Society
|October 14, 2005
概括
化催化剂使乳化物的立体选择环开放聚合成为可能,产生具有受控分子量和微观结构的多聚化物. 这些催化剂为先进的材料应用提供精确控制聚合物特性.
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
- 材料科学 材料科学 材料科学
背景情况:
- 环开聚合 (ROP) 对于合成可生物降解的聚合物,如聚酸至关重要.
- 控制聚合物微结构和立体化学对于量身定制材料特性至关重要.
- 状催化剂为立体选择性聚合提供了途径,但乳酸盐的高效系统仍在开发中.
研究的目的:
- 为了准备和表征基于循环基联体的性异氧化物.
- 使用这些催化剂,研究乳化物的立体选择性环开放聚合.
- 为了确定动力学,选择性,以及由此产生的聚酸微结构.
主要方法:
- 合成性异氧化物与反或赛性环合连接物.
- 在70°C的烯中,乳酸酶体和赛混合物的环开聚合.
- 动力学研究,聚合物分子重量,聚分散性和微观结构 (NMR光谱) 的分析.
- 使用速率常数比和选择性因子确定催化剂的选择性.
主要成果:
- 总是得到了具有受控分子量,低多分散性和定义的终端组的多聚化物.
- (R,R) - 环基盐AlO ((i) ((() Pr聚合的l-乳化物比d-乳化物快大约14倍.
- 将rac-lactide与 (R,R) - 1聚合,得到了具有约5.5.5的选择性因子的晶体聚合物.
- 具有高点和结晶度的立体块共聚酸被从乳酸盐混合物和血糖催化剂中合成.
结论:
- 化异氧化物是立体选择性乳聚合物的有效催化剂.
- 催化剂可以控制聚合物分子量,聚分散性和立体化学.
- 这些发现使得针对不同应用的特定微观结构和特性进行量身定制的多聚胺的合成成为可能.
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