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Synthesis and characterization of new soluble aromatic poly(ureaimide)s from N , N ′‐dimethyl‐ N , N ′‐bis(aminophenyl)ureas and aromatic tetracarboxylic dianhydrides
Author(s) -
Park Ki Hong,
Tani Takashi,
Kakimoto Masaaki,
Imai Yoshio
Publication year - 1998
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(19980301)199:3<457::aid-macp457>3.0.co;2-w
Subject(s) - imide , polymer chemistry , glass transition , urea , chemistry , thermal stability , diamine , monomer , polymer , organic chemistry
New poly(urea‐imide)s having inherent viscosities of 0.26–0.57 dL/g were synthesized in two steps by ring‐opening polyaddition of N,N ′‐dimethyl‐ N,N ′‐bis(aminophenyl)ureas to various aromatic tetracarboxylic dianhydrides giving poly(amic acid)s, followed by thermal cyclodehydration. All the poly(urea‐imide)s showed amorphous patterns in the wide angle X‐ray diffractograms. Most of the poly(urea‐imide)s were soluble in organic solvents, especially phenolic solvents such as m ‐cresol and o ‐chlorophenol, and the polymers synthesized from the 3,4′‐type diamine were more soluble than those from the 4,4′‐type monomer. The glass transition temperatures and 10% weight loss temperatures under nitrogen of the poly(urea‐imide)s were in the range of 218–263°C and 455–500°C, respectively.