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Miscibility and crystallization behavior of thermosetting polyimide/thermoplastic polyimide blends
Author(s) -
Tang Hao,
Dong Lisong,
Zhang Jin,
Ding Mengxian,
Feng Zhiliu
Publication year - 1996
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.1996.021970210
Subject(s) - thermosetting polymer , materials science , polyimide , differential scanning calorimetry , thermoplastic , miscibility , composite material , crystallization , scanning electron microscope , small angle x ray scattering , polymer , dynamic mechanical analysis , polymer chemistry , chemical engineering , scattering , physics , optics , layer (electronics) , engineering , thermodynamics
Compatibility, morphology, crystalline structure and mechanical properties of the blends of a thermosetting polyimide with thermoplastic polyimides consisting of dianhydrides of different lengths have been studied by the use of dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and small angle X‐ray scattering (SAXS) techniques. The results of our research show that the blends change from compatible to semi‐compatible when the difference between the length of the dianhydrides of the two components increases. Addition of a thermoplastic polyimide inhibits the crystallization of the thermosetting component. However, this effect decreases with increasing length of the dianhydrides and the distribution of the molecules of the thermoplastic polyimide component changes from interlamellar to interfibrillar. Impact strength and morphology of the fractured surfaces indicate that among the semi‐interpenetrating polymer networks (semi‐IPN) obtained the toughening effect of the partially compatible one is the best. The results are discussed in terms of charge transfer interaction between imide group and p ‐phenylene group.