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Synthesis and properties of polyamide–imides containing fluorenyl cardo structure
Author(s) -
Hu Zhiqiang,
Li Shanjun,
Zhang Chunhua
Publication year - 2007
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.26758
Subject(s) - diamine , condensation polymer , polyamide , polymer chemistry , imide , materials science , triphenyl phosphite , glass transition , tetrahydrofuran , phenylene , solubility , polymer , trimellitic anhydride , chemistry , organic chemistry , solvent , composite material
A series of alternating polyamide–imides (PAIs) with fluorenyl cardo having inherent viscosities of 0.38–0.88 dL/g was synthesized by one‐pot polycondensation of cardo diamines, trimellitic anhydride, and various aromatic diamines including p ‐phenylene diamine, m ‐phenylene diamine, 4,4'‐oxydianiline, 3,4'‐oxydianiline, 2,2‐bis[4‐(4‐aminophenoxy)phenyl]propane, 2,2‐bis[4‐(3‐amino phenoxy)phenyl]propane using triphenyl phosphite as condensing agents. Most of the polymers were readily soluble in a variety of organic solvents, such as N ‐methyl‐2‐pyrrolidin‐one, N,N ‐dimethylacetamide (DMAc), N,N ‐dimethylformamide, dimethyl sulfoxide, pyridine, and tetrahydrofuran, etc. PAIs exhibited better solubility when alkyl substituents were incorporated. Moreover, the effects of the linkage of imide/amide on the properties of PAIs were also discussed. The glass‐transition temperatures of these polymers were recorded between 235 and 448°C by DSC and 10% weight loss temperature of all polymers exceed 450°C in air. The films of the resulting PAIs could be cast from their DMAc solutions. These films had a tensile strength in the range of 43‐111 MPa, and an elongation at break in the range of 1.5–7.1%. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007