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Synthesis and characterization of fully rodlike poly(4,4 '-biphenylene pyromellitimide)s with various short side groups SCIE SCOPUS

Title
Synthesis and characterization of fully rodlike poly(4,4 '-biphenylene pyromellitimide)s with various short side groups
Authors
Pyo, SMKim, SIShin, TJPark, YHRee, M
Date Issued
1999-04-01
Publisher
JOHN WILEY & SONS INC
Abstract
Fully rodlike poly(4,4-biphenylene pyromellitimide) (PMDA-BZ) is so brittle in spite of its extremely high modulus. In this study, the brittleness was attempted to be improved without a significant sacrifice of the high modulus by incorporating short side groups. For this, benzidine monomers, which contain methyl, methoxy, fluoro, and trifluoromethyl at the 2,2'-positions, were synthesized and then used for polycondensation reactions with pyromellitic dianhydride in N-methyl-2-pyrrolidone, producing soluble poly(amic acids)s. The synthesized poly(amic acid)s were converted to the fully rodlike polyimides in films by a conventional spin-coating on substrates, soft bake, and thermal imidization. The brittleness of PMDA-BZ was successfully healed with a small portion of sacrifice in the modulus by incorporating methyl, methoxy, and trifluoromethyl groups but could not be healed by the fluoro side group. The improvement in the brittleness might be contributed from the chain mobility and lateral chain packing order enhanced by the incorporation of the side groups, which are evident on the measured structures and properties. The structure and other properties were detected to be influenced by the incorporated side groups. The detailed structures and properties were interpreted by considering roles of side groups and the correlation between structure and properties, respectively. (C) 1999 John Wiley & Sons, Inc.
Keywords
benzidine; short side group; polyimide; structure; mechanical properties; optical properties; thermal stability; thermal expansion; residual stress; THIN-FILMS; AROMATIC POLYIMIDES; RESIDUAL-STRESS; BEHAVIOR; POLY; MISCIBILITY; ORIENTATION; SCATTERING; PRECURSORS; MIXTURES
URI
https://oasis.postech.ac.kr/handle/2014.oak/20470
DOI
10.1002/(SICI)1099-0518(19990401)37:7<937::AID-POLA10>3.0.CO;2-I
ISSN
0887-624X
Article Type
Article
Citation
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, vol. 37, no. 7, page. 937 - 957, 1999-04-01
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이문호REE, MOONHOR
Dept of Chemistry
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