Cationic Polymerization in Clusters and in the Gas Phase

在化学学部物理化学专业的这个项目中，El-Shall将运用新技术研究团簇和气相的阳离子聚合。本文将对烯烃范德华团簇中离子引发后的不同反应途径和机理进行表征，并对产生的聚合离子进行鉴定。相关气相反应的速率信息将通过离子回旋共振（ICR）和高压质谱进行研究。还将探讨涉及过渡金属离子和电荷转移的新引发机制。这个项目涉及到化学过程的研究，在这个过程中，试剂分子（称为单体）不断地反应，最终形成一个非常大的分子，称为聚合物。聚合物在塑料和纺织品等不同领域具有相当大的商业应用。这项工作将研究所选择的聚合过程中涉及的反应步骤，并将试图找到新的机制，通过这种机制可以生产具有理想性能的聚合物，例如导电性。这些研究的结果可能会影响重要的商业过程。* * *

9311643 El-Shall In this project in the Physical Chemistry Program of the Chemistry Division, El-Shall will apply new techniques to study cationic polymerization in clusters and in the gas phase. The different reaction pathways and mechanisms following ionic initiation in van der Waals clusters of olefins will be characterized, and the resulting polymeric ions will be identified. Rate information on related gas-phase reactions will be studied by ion cyclotron resonance (ICR) and high-pressure mass spectroscopy. New initiation mechanisms involving transition metal ions and charge-transfer will also be explored. %%% This project involves the study of chemical processes in which reagent molecules (called monomers) react to continually add together to form what eventually becomes a very large molecule, called a polymer. Polymers have considerable commercial application in such diverse areas as plastics and textiles. This work will investigate the reaction steps involved in selected polymerization processes and will attempt to find new mechanisms by which polymers with desirable properties, such as electrical conductivity, can be produced. The results of these studies may impact important commercial processes. ***