PREPARATION AND CHARACTERIZATION OF MODIFIED POLY (IMIDE-AMIDE) S WITH BENZAZOLE PENDENT GROUPS AND FLEXIBLE ETHER LINKAGES

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TOISERKANI HOJJAT

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Seminar Paper

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Seminar: IRANIAN SEMINAR OF ORGANIC CHEMISTRY
Year:2012 | Issue:19

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Title

PREPARATION AND CHARACTERIZATION OF MODIFIED POLY (IMIDE-AMIDE) S WITH BENZAZOLE PENDENT GROUPS AND FLEXIBLE ETHER LINKAGES

Author(s)

TOISERKANI HOJJAT

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Abstract

POLYIMIDES HAVE BEEN USED EXTENSIVELY IN THE AEROSPACE AND ELECTRONICS FIELDS BECAUSE OF THEIR THERMAL STABILITY AND EXCELLENT MECHANICAL AND ELECTRICAL PROPERTIES. DESPITE THEIR WIDESPREAD USE, POLYIMIDES ARE GENERALLY INTRACTABLE AND LACK THE PROPERTIES ESSENTIAL FOR SUCCESSFUL FABRICATION INTO USEFUL FORMS BECAUSE OF THEIR HIGH MELTING AND THEIR LIMITED SOLUBILITY IN ORGANIC SOLVENTS.ONE OF THE IMPORTANT MODIFICATIONS FOR MAKING PROCESSABLE POLYIMIDES IS COPOLYMERIZATION. IT HAS BEEN GENERALLY RECOGNIZED THAT FLEXIBLE LINKAGES AND THE BULKY LATERAL GROUPS IMPART BETTER SOLUBILITY AND MELT-PROCESSING CHARACTERISTICS COMPARED WITH POLYMERS WITHOUT THESE LINKAGES.THREE SERIES OF MODIFIED POLY (IMIDE-AMIDE) S, PIAS, WERE PREPARED FROM DICARBOXYLIC ACIDS, 1, 2, A N D 3, WITH VARIOUS DIAMINES BY THE DIRECT POLYCONDENSATION IN N -METHYL-2-PYRROLIDINONE (NMP) USING TRIPHENYL PHOSPHITE AND PYRIDINE AS CONDENSING AGENTS. THE CHARACTERIZATION OF THE POLYMERS WAS PERFORMED WITH INHERENT VISCOSITY MEASUREMENTS, SOLUBILITY TESTS, FT-IR, AND 1H-NMR SPECTROSCOPY AND THERMOGRAVIMETRY. ALL THE POLYMERS WERE OBTAINED IN QUANTITATIVE YIELDS WITH INHERENT VISCOSITIES OF 0.39-0.65 DL G-1. FOR COMPARATIVE PURPOSES, THE CORRESPONDING UNSUBSTITUTED PIAS WERE ALSO PREPARED BY REACTING A DICARBOXYLIC ACID MONOMER4 (LACKING PENDENT GROUP) WITH THE SAME DIAMINES UNDER SIMILAR CONDITIONS. THE SOLUBILITIES OF MODIFIED POLYMERS IN COMMON ORGANIC SOLVENTS AS WELL AS THEIR THERMAL STABILITY WERE ENHANCED COMPARED TO THOSE OF THE CORRESPONDING UNMODIFIED PIAS.

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APA: Copy

TOISERKANI, HOJJAT. (2012). PREPARATION AND CHARACTERIZATION OF MODIFIED POLY (IMIDE-AMIDE) S WITH BENZAZOLE PENDENT GROUPS AND FLEXIBLE ETHER LINKAGES. IRANIAN SEMINAR OF ORGANIC CHEMISTRY. SID. https://sid.ir/paper/909492/en

Vancouver: Copy

TOISERKANI HOJJAT. PREPARATION AND CHARACTERIZATION OF MODIFIED POLY (IMIDE-AMIDE) S WITH BENZAZOLE PENDENT GROUPS AND FLEXIBLE ETHER LINKAGES. 2012. Available from: https://sid.ir/paper/909492/en

IEEE: Copy

HOJJAT TOISERKANI, “PREPARATION AND CHARACTERIZATION OF MODIFIED POLY (IMIDE-AMIDE) S WITH BENZAZOLE PENDENT GROUPS AND FLEXIBLE ETHER LINKAGES,” presented at the IRANIAN SEMINAR OF ORGANIC CHEMISTRY. 2012, [Online]. Available: https://sid.ir/paper/909492/en

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