期刊
JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY
卷 A40, 期 10, 页码 991-1008出版社
TAYLOR & FRANCIS INC
DOI: 10.1081/MA-120024459
关键词
chlorosilyl functional initiators; silicon functional polyisobutylenes; polymer brushes; grafting from; grafting to; free initiator; surface bound initiator; surface-initiated living cationic polymerization; grafting density
A series of novel chlorosilyl functional initiators have been prepared and applied for the first time in the living cationic polymerization of isobutylene (113). Well-defined polyisobutylenes (PIBs) carrying mono-, di-, and tri-chlorosilyl head-group, and a tert-chloro end-group were synthesized using newly designed silyl-functional initiators in conjunction with TiCl4 in Hex: MeCl (60:40, v:v) at -80degreesC. EDd-group analysis by H-1 NMR spectroscopy verified the product structure and the survival of the Si-Cl head-groups during the polymerization. The chlorosilyl functional initiators and chlorosilyl functional PIBs have been employed for the synthesis of PIB brushes on-planar silicate substrates by the grafting from and grafting to techniques. The products were characterized by x-ray photoelectron spectra (XPS), atomic force microscopic (AFM), and ellipsometry. The grafting from approach yielded surface-bound polymer brushes with more uniform surface and higher grafting density compared to the grafting to technique. The film thickness of PIB brushes formed by grafting from increased linearly with increasing molecular weight of PIB. In contrast, PIB brushes produced by grafting to gave constant thickness independent of the molecular weight of PIB.
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