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LC‐polyimides, 32. Characterization of the Mitsui‐Toatsu LC‐polyimide and related polyimides
Author(s) -
Schwarz Gert,
Sun S.J.,
Kricheldorf Hans R.,
Ohta Masahiro,
Oikawa Hideaki,
Yamaguchi Akihiro
Publication year - 1997
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/macp.1997.021981011
Subject(s) - polyimide , materials science , thermotropic crystal , polymer chemistry , bpda , imide , diamine , benzene , condensation polymer , phase (matter) , polyamide , polymer , organic chemistry , liquid crystalline , chemistry , layer (electronics) , composite material
Abstract Two polyimides were prepared from 1,3‐bis[4′‐(4″‐aminophenoxy)cumyl]benzene and 1,2:4,5‐benzenetetracarboxylic dianhydride (PMDA) or 1,8:4,5‐naphthalenetetracarboxylic dianhydride. A poly(amide‐imide) was prepared from the same diamine and trimellitic anhydride. Furthermore, two polyimides were prepared from 1,4‐bis‐[4′‐(4″‐aminophenoxy)cumyl]benzene or a mixture of the 1,3‐ and 1,4‐diamines. Moreover, one polyimide was synthesized from PMDA and 1,3‐(4‐aminocumyl)benzene. All polyimides were characterized by elemental analyses, optical microscopy, DSC and various X‐ray measurements. Only the polyimide of PMDA and the 1,3‐amine proved to be thermotropic. SAXS and WAXS measurements between 25 and 350°C, along with a fiber pattern suggest that this LC‐polyimide forms a smectic‐A phase in the melt and a disordered smectic‐B phase in the solid state. Also most other polyimides formed a disordered smectic‐B or a smectic‐A glass in the solid state. However, the polyimide derived from 1,3‐(4‐aminocumyl)benzene crystallized in the form of a smectic‐H phase with tilted mesogens. All results together underline the high potential of polyimides of form layer structures.