期刊
POLYMER
卷 52, 期 24, 页码 5551-5559出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2011.09.051
关键词
Gas phase thermal polymerization; Mayo mechanism; Styrene dimer
资金
- National Science Foundation [CHE-0911146]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [911146] Funding Source: National Science Foundation
In this work, we present direct evidence for the thermally self-initiated polymerization of styrene in the gas phase. Our approach is based on on-line analysis of the gas phase oligomers by mass-selected ion mobility. The mobility measurements provide structural information on the ionized oligomers based on their collision cross sections (Omega) which depend on the geometric shapes of the ions. Theoretical calculations of possible structural candidates of the oligomer ions are then used to compute angle averaged Omega for comparison with the measured ones. The agreement between the measured and calculated Omega of the candidate structures provides reliable assignments to the structures of the oligomers. Furthermore, collisional-induced dissociations of the mass-selected oligomer ions provide further support for the structures obtained from the mobility measurements. Structural characterization, mechanisms of formation and the observed fragmentation pathway of the growing dimers and trimers in the gas phase are presented and discussed. Our results indicate that the gas phase thermal polymerization of styrene proceeds via essentially the same initiation mechanism (the Mayo mechanism) as in condensed phase polymerization. (C) 2011 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据