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One‐Pot Synthesis of an Alternating Copolyimide Based on Regioselective Reaction of a Non‐Symmetrical Alicyclic Dianhydride
Author(s) -
Kudo Kazuaki,
Yoshizawa Takuya,
Hamada Takashi,
Li Jun,
Sakamoto Seiji,
Shiraishi Shinsaku
Publication year - 2006
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200600319
Subject(s) - alicyclic compound , monomer , amide , glass transition , regioselectivity , polymer chemistry , solubility , materials science , amorphous solid , polyamide , molar ratio , prepolymer , chemistry , organic chemistry , polymer , catalysis , polyurethane
Summary: Four constitutionally isomeric copoly(amide acid)s (coPAAs), two alternating and two random, have been successfully obtained from the same combination of one non‐symmetrical alicyclic tetracarboxylic dianhydride (1.0 molar equivalents) and two symmetric aromatic diamines (0.5 molar equivalents each) by only slightly changing the reaction procedures. When the reaction mixture is subjected to chemical imidization conditions without isolation of coPAAs, the corresponding copolyimides (coPIs) are obtained in one pot. All of the coPIs are slightly yellow amorphous powders and the solubility of them is similar to each other. The glass transition temperatures of the alternating coPIs are lower in comparison to those of the random coPIs.Schematic of the possible arrangement of monomers in the copoly(amide acid)s/copolyimides synthesized here.