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Synthesis and properties of new semifluoroalkylene‐containing aromatic‐aliphatic polyamides derived from aromatic diamines and semifluoroaliphatic dicarboxylic acids
Author(s) -
Yoneyama Masaru,
Yamazaki Kaori,
Kakimoto Masaaki,
Imai Yoshio
Publication year - 1999
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19991001)200:10<2208::aid-macp2208>3.0.co;2-p
Subject(s) - polyamide , polymer chemistry , pyridine , condensation polymer , chemistry , fluorine , polymer , dicarboxylic acid , triphenyl phosphite , glass transition , diamine , organic chemistry
New semifluoroalkylene‐containing aromatic‐aliphatic polyamides having number‐average molecular weights of 30 000–119 000 were prepared by the direct polycondensation of various aromatic diamines with octafluorodecanedioic and dodecafluorododecanedioic acids in NMP using the triphenyl phosphite‐pyridine system as a condensing agent. All the fluorine‐containing polyamides are highly soluble in a variety of organic solvents including NMP and DMAc, compared with the fluorine‐free counterpart polymers. Most of the polyamides are crystalline and have melting temperatures of 195–272°C, which are lower than those of the corresponding fluorine‐free polymers. These fluorine‐bearing polyamides have glass transition temperatures of 134–178°C, and begin to lose weight at about 320–340°C in nitrogen. The contact angles of film surfaces of the fluorine‐containing polyamides to water are in the range of 77–103°, which are higher than those of the fluorine‐free polyamides.