ISSN:
0025-116X
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
Copolyimides, their microstructure being determined by the method of synthesis, were prepared by copolycondensation of 4,4′-oxydiphthalic anhydride (1a), 4,4′-carbonyldipthalic anhydride (1b), or 1,8:4,5-naphthalenetetracarboxylic anhydride with a mixture of two diamines, hexa-, octa-, or dodecamethylene diamine (5a, 6a, 7a) and cardo-diamines 9,9-bis(4′-aminophenyl)fluorene (3a) and 3,3-bis(4′-aminophenyl)phthalide (4) or two aromatic diamines, 4,4′-oxydianiline (9) and 2,2-bis(4-aminophenyl)hexafluoropropane (8), at various mole ratios of the comonomers. Blockcopolyimides with five-membered imide cycles were formed by catalytic imidization of the intermediate polymers prepared by addition of the solid dianhydride to a solution of the mixture of the two diamines, whereas the thermal cyclization of such polymers and the one-step high-temperature synthesis led to random copolyimides. The thermal and mechanical properties of the copolyimides with various microstructure and their solubility in organic solvents were compared.
Zusätzliches Material:
1 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/macp.1983.021840201
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