Gamma radiation induced polymerization of vinyl monomers in dense CO2

被引：11

作者：

Caputo, G ^{[1
]}

Galia, A ^{[1
]}

Scrò, F ^{[1
]}

Spadaro, G ^{[1
]}

Filardo, G ^{[1
]}

机构：

[1] Univ Palermo, Dipartimento Ingn Chim Proc & Mat, I-90128 Palermo, Italy

来源：

RADIATION PHYSICS AND CHEMISTRY | 2002年 / 63卷 / 01期

关键词：

radiation polymerization; vinyl monomers; dense carbon dioxide;

D O I：

10.1016/S0969-806X(01)00480-7

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The dispersion polymerization of methyl methacrylate in dense carbon dioxide, initiated by gamma-rays, utilizing different polysiloxanes as polymeric stabilizers, was investigated. The progress of the reaction, as a function of the irradiation dose, was also studied and the occurrence of a gel effect has been detected. For comparison, the dispersion polymerization has been carried out in supercritical conditions (T = 65degreesC and 38 MPa) in the presence of 2,2'-azobis(isobutyronitrile) (AIBN) as initiator. High molecular weight polymer (M-w > 1000 kg/mol) with narrow molecular weight distribution has been obtained both with gamma-rays and AIBN. The electron scanning micrographs show that regular spherical particles (average diameter ca. 2.5 mum) with narrow particle size distribution have been obtained through the dispersion polymerization mechanism in CO2. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：45 / 51

页数：7

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