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• W2094343489 abstract "Polyamideimide-branched siloxanes (PAIBrSs) were synthesized from 4, 4′-(hexafluoroisopropyllidene)diphthalic anhydride (6FDA), p,p′-oxydianiline (ODA), and aminopropyl-terminated oligomeric dimethylsiloxane (ODMS). In this investigation, a mixture of N-methylpyrrolidinone (NMP) and tetrahydrofuran (THF) was used as a cosolvent for the homogeneous mixing of poly(amic acid) (PA) and the ODMS solution. Thionyl chloride (SOCl2) was used for the acylation of PA to activate the reaction between PA and ODMS. FTIR spectra showed an increase in the intensity of characteristic absorption peaks of dimethylsiloxane units with the amount of ODMS reacted. From thermogravimetric analysis (TGA), PAIBrSs showed good thermal stability, but relatively low thermal stability when compared with that of block poly(imide siloxane) (PIBlS) or poly(amideimide siloxane) (PAIBlS). A solubility test showed that dipolar aprotic solvents were relatively good solvents for the polymer. Gas separation was performed by single gas-permeation equipment. The permeabilities of PAIBrS membranes are higher than those of PIBlS membranes and the selectivities of PAIBrS membranes are lower than those of PIBlS membranes. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 965–973, 1999" @default.
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• W2094343489 date "1999-10-24" @default.
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• W2094343489 title "Synthesis and characterization of polyamideimide-branched siloxane and its gas-separation" @default.
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• W2094343489 doi "https://doi.org/10.1002/(sici)1097-4628(19991024)74:4<965::aid-app23>3.0.co;2-4" @default.
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