Synthesis and Properties of Low-Thermal-Expansion Polyamic Esters

Polyamic acid esters (PAE) were synthesized from biphenyltetracarboxylic dialkylester dichlorides (alkyl group: methyl, ethyl, n-propyl, and n-butyl) and p-phenylenediamine (PDA). The weight-average molecular weights (Mw) ranged from 51000 to 60000. Solution viscosities of the polyamic esters were l...

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Bibliographic Details
Published inKOBUNSHI RONBUNSHU Vol. 50; no. 12; pp. 947 - 952
Main Authors OKABE, Yoshiaki, MIWA, Takao, TAKAHASHI, Akio, NUMATA, Shun-ichi
Format Journal Article
LanguageJapanese
Published Tokyo The Society of Polymer Science, Japan 01.01.1993
Tsukiji daisan nagaoka
Subjects
Esterification
Hydrogen Bond
Imidization
Low Thermal Expansion
Polyamic Ester
Polyimide
Thermal Expansion Coefficient
Varnish Viscosity
Weight-Average-Molecular Weight
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Summary:Polyamic acid esters (PAE) were synthesized from biphenyltetracarboxylic dialkylester dichlorides (alkyl group: methyl, ethyl, n-propyl, and n-butyl) and p-phenylenediamine (PDA). The weight-average molecular weights (Mw) ranged from 51000 to 60000. Solution viscosities of the polyamic esters were lower than that of the polyamic acid (PAA) synthesized from biphenyltetracarboxylic dianhydride (BPDA) and PDA. The values of elongation at breakwere 16-20% for all the films, and thermal expansion coefficients of the films ranged from 1.8×10-5/K to 2.2×10-5/K. The values were larger than that of the polyimide film (0.5×10-5/K) formed from the corresponding PAA.
ISSN:0386-2186
1881-5685
DOI:10.1295/koron.50.947