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Structure–property correlation for thin films of semi‐interpenetrating polyimide networks. I. Miscibility, curing, and morphology studies
Author(s) -
Liou HueyChiang,
Ho Paul S.,
Tung Betty
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19981010)70:2<261::aid-app6>3.0.co;2-s
Subject(s) - polyimide , bpda , miscibility , materials science , polymer chemistry , morphology (biology) , fourier transform infrared spectroscopy , curing (chemistry) , polymer , interpenetrating polymer network , chemical engineering , composite material , layer (electronics) , biology , engineering , genetics
Three different semi‐interpenetrating polymer network (semi‐IPN) polyimide systems were prepared through blending in solution by using 2 different polyimides, BPDA–PDA and PMDA–ODA (E), and 2 different oligomers, bismaleimide (MDAB) and phenylthynyl‐terminated BPDA–PDA (BPDA–PDA–PEPA) oligomers. The oligomers are used as crosslinkers to modify the morphology of polyimides. The results show that both MDAB and PEPA are miscible with BPDA–PDA, but MDAB is immiscible with PMDA–ODA (E). Fourier transform infrared spectrum, dynamic mechanical thermal analysis data, and calculated crosslinking density indicate that there are crosslinking networks in these semi‐IPN polyimide systems. In addition, the density and wide‐angle X‐ray diffraction results confirm that the molecular ordering and packing order are reduced by the addition of oligomers for these semi‐IPN polyimide systems. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 261–272, 1998