Journal
JOURNAL OF POLYMER RESEARCH
Volume 19, Issue 3, Pages -Publisher
SPRINGER
DOI: 10.1007/s10965-012-9845-1
Keywords
Poly(amide-imide)s; Structure-property relationship; Diacids monomer; Phosphorylation reaction
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Two diimide-diacid monomers 4,4'-bis[4 ''-(trimellitimido)phenyl isopropylidene-4'-phenoxy]diphenyl sulfone and 4,4'-bis[4 ''-(trimellitimido)phenylisopropylidene-4'-phenoxy] were synthesized. The structures of the monomers were characterized by FT-IR and H-1-NMR spectroscopy. A series of novel poly(amide-imide)s were prepared from this two diacids and aromatic diamines through phosphorylation reaction. The PAIs were characterized by FT-IR, H-1-NMR, XRD, TGA, and DSC, solution viscosity, solubility test and electrical properties. Poly(amide-imide)s showed excellent solubility due to the presence of flexible groups and isopropylidene unit in the polymer backbone. They also exhibited good thermal stability and the temperatures at which 10% weight loss occurred in the range 385-465 degrees C. These PAIs found to have a dielectric constant in the range 3.25-4.20 at 10 kHz and have excellent electrical insulation character and can be used as insulation materials for electrical items operating at elevated temperatures.
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