期刊
EUROPEAN POLYMER JOURNAL
卷 39, 期 1, 页码 107-114出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0014-3057(02)00181-7
关键词
polysulfone; liquid crystalline; thermotropic; azomethine
Polysulfone udel was chemically functionalized with chloromethylene functional groups via the chloromethylation reaction. A new azomethine dimesogen containing one phenolic hydroxyl functional group was recently synthesized and proved to exhibit a large nematic mesophase range in the liquid state. Further reaction of the dimesogen with the functionalized polysulfone using a transquaternization reaction led to new polysulfones bearing pendant rigid dimesogenic units-no spacer being involved in the chemical design of the polymer. The polymers were characterized by IR, H-1 NMR spectroscopy techniques, and their thermotropic liquid crystallinity behaviour was studied by optical polarizing microscopy (PLM) and DSC measurements. Enantiotropic nematic mesophases were observed under the PLM. A dependence of the melting temperature on the degree of substitution was noticed. (C) 2002 Elsevier Science Ltd. All rights reserved.
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