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Preparation and thermal kinetics of poly(imide‐siloxanes)
Author(s) -
Moon Yoon Duk,
Lee Young Moo
Publication year - 1993
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/app.1993.070500818
Subject(s) - pyromellitic dianhydride , phthalic anhydride , imide , polyimide , thermal decomposition , polymer chemistry , thermogravimetric analysis , activation energy , kinetics , order of reaction , materials science , glass transition , chemistry , reaction rate constant , organic chemistry , polymer , catalysis , physics , layer (electronics) , quantum mechanics
Thermoplastic poly(imide‐siloxanes) (PISILs) were synthesized from hexafluoroisopro‐pylidene‐2,2‐bis(phthalic acid anhydride) (6FDA), 3,3',4,4'‐benzophenonetetracarboxylic dianhydride (BTDA), pyromellitic dianhydride (PMDA), and amine‐terminated poly(dimethyl siloxanes) (PDMS) having different molecular weights. Glass transition temperatures of fully cured PISILs ranged from −91 to −48°C. Various kinetic parameters for the thermal decomposition reaction of PISILs were examined by dynamic thermogravimetric analysis (DTGA) at four different heating rates. The degradation path was a kinetically first‐order reaction for PISILs (abbreviated 6FDA‐860, BTDA‐860, and PMDA‐860, respectively) from 6FDA, BTDA, PMDA, and PDMS ( M n = 860 g/mol). The reaction rate constant times the half‐life ( k × t 1/2 ) was approximately 0.693. The activation energies for decomposition were in the following order: 6FDA‐860