期刊
POLYMER
卷 45, 期 4, 页码 1073-1078出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2003.12.025
关键词
poly(ether imide); macrocycle; ortho-aminophenoxy diamine
The new ortho-aminophenyl diamine 1,2-bis(2'-aminophenoxy)benzene has been synthesized and polymerized with 1,2-bis(3',4'dicarboxyphenoxy)benzene dianhydride to yield a poly(ether imide) with four ortho-catenated phenylenes per structural repeat unit. The polymer has been characterized by gel permeation chromatography and MALDI-TOF mass spectrometry and shown to contain a large proportion of oligomers. The oligomers have been found to be primarily macrocyclic oligomers with two to 10 repeat units. The results are contrasted with the high-molecular-weight polyimides formed from corresponding para-aminophenoxy diamines. It is concluded that either the ortho-aminophenoxy moiety or the large sequence of ortho-catenated phenylene rings gives a high propensity for ring closure and macrocycle formation in competition with propagation. (C) 2003 Elsevier Ltd. All rights reserved.
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