Synthesis and Mesoscopic Organization of Perfluoroalkyl-Alkylene Methacrylate Monomers
作者:
Jens Höpken,
Sabine Faulstich,
Martin Möller,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1992)
卷期:
Volume 210,
issue 1
页码: 59-73
ISSN:1058-725X
年代: 1992
DOI:10.1080/10587259208030757
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Alcohols with perfluorinated segments, F(CF2)n—(CH2)m—OH;n= 8, 10, 12;m= 4, 6, 10; have been converted into methacrylates by a dicyclohexylcarbodiimide activated esterification reaction. The resulting methacrylates show two disordering transitions prior to isotropization. Polarization optical microscopy indicates the occurrence of smectic liquid crystal phases. Organic solutions of the amphiphilic methacrylates showed a strong decrease in the surface tension at low concentrations. Peculiar surface activity had already been observed for the compound with the shortest fluorocarbon segment. Needle shaped crystallites of the semifluorinated compounds are formed when hydrocarbon solutions of methacrylates with a perfluorododecyl substituent are cooled. The crystals can form a fine mesh network which encloses the solvent in the cavities. The size of the needle crystals and the internal dimensions of the network depend strongly on the crystallization conditions.
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