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4,4′‐Isophthaloyidiphthalic anhydride polyimides
Author(s) -
Pratt J. R.,
Blackwell D. A.,
St. Clair T. L.,
Allphin N. L.
Publication year - 1989
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760290111
Subject(s) - materials science , differential scanning calorimetry , thermogravimetric analysis , kapton , crystallinity , thermal stability , solubility , isothermal process , polymer chemistry , diamine , polyimide , amorphous solid , chemical engineering , composite material , organic chemistry , chemistry , thermodynamics , physics , layer (electronics) , engineering
A series of polyimides based on 4.,4′‐isophthaloyldiphthalic anhydride (IDPA) was prepared and characterized by inherent viscosity, differential scanning calorimetry (DSC), solubility, wide‐angle X‐ray scattering (WAXS), and isothermal thermogravimetric analysis (ITGA). Film forming, tough, insoluble polyimides were obtained with most of the 11 diamines used for evaluation. Two materials were semicrystalline. Several compositions showed excellent thermooxidative stability by ITGA at 300 and 350°C in air, as compared to Kapton‐H (Du Pont) film. The IDPA‐m‐phenylenediamine (m‐PDA) composition, for example, gave a flexible, amorphous film having a T g of 259°C (identical with LARC‐TPI) and insoluble in a wide range of solvents. It is based on a potentially low‐cost dianhydride (IDPA) and, unlike LARC‐TPI, a low‐cost, domestically available diamine which gives a negative Ames test.