期刊
POLYMER
卷 49, 期 19, 页码 4141-4149出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2008.07.021
关键词
syndiotactic polystyrene; polymer morphology; crystallization
资金
- LG Chemical Company
The nascent morphology of semi-crystalline syndiotactic polystyrene (sPS) polymerized over silica-supported pentamethyl cyclopentadienyl titanium trimethoxide (Cp*Ti(OCH3)(3)) catalyst in a liquid slurry polymerization has been investigated under various reaction conditions. The scanning electron microscopic analysis of nascent polymers reveals that sPS molecules grow as long nanofibrils of 30-50 nm diameter and X-ray diffraction analysis shows the co-crystalline phases including both sPS and low molecular weight guest molecules of monomer and diluent. The energy dispersive X-ray spectroscopy also shows that the disintegration of silica primary particles occurs during the polymerization as evidenced by the uniform dispersion of silicon and aluminum in a polymer particle. The fibrous growth of the polymer inside a polymer particle leads to the shape replication of the original silica particles. (C) 2008 Elsevier Ltd. All rights reserved.
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