SYNTHESIS AND PROPERTIES OF NEW HEAT-RESISTANT PYRIDINE-BASED POLYIMIDES CONTAINING PREFORMED AMIDE UNITS

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TAREMI F.; MAHDIPOUR ATAEI SH.; MAHMOUDI ALI

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: Iranian Polymer Journal Year:2010 | Volume:19 | Issue:11 (125) Page(s): 875-883

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Title

SYNTHESIS AND PROPERTIES OF NEW HEAT-RESISTANT PYRIDINE-BASED POLYIMIDES CONTAINING PREFORMED AMIDE UNITS

Author(s)

TAREMI F. | MAHDIPOUR ATAEI SH. | MAHMOUDI ALI | Issue Writer Certificate

Keywords

SYNTHESIS

POLYIMIDES

POLYCONDENSATION

HIGH PERFORMANCE POLYMERS

THERMAL PROPERTIES

Abstract

A new diamine monomer containing pyridine and amide units was prepared via two step reactions. Nucleophilic chloro-displacement reaction of 2,6-diaminopyridine with 4-nitrobenzoyl chloride in the presence of propylene oxide afforded 2,6- bis(4-nitrobenzamido)pyridine and subsequent reduction of the nitro groups led to 2,6- bis(4-aminobenzamido)pyridine. The diamine was reacted with aromatic dianhydrides including pyromellitic dianhydride, benzophenone tetracarboxylic dianhydride, and hexafluoroisopropylidene diphthalic anhydride to form POLYIMIDES via two-step POLYCONDENSATION method, and formation of poly(amic acid) followed by chemical imidization. All the prepared materials and POLYIMIDES were fully characterized by common spectroscopic methods and elemental analysis. Physical and THERMAL PROPERTIES of the polymers including solubility, inherent viscosity, thermal behaviour and thermal stability were studied and structure-property relations in these POLYIMIDES were investigated. The inherent viscosity of the POLYIMIDES in NMP at a concentration of 0.5 g.dL-1 at 30°C was between 0.47-0.51 dL/g. The polymers showed high thermal stability while their solubilities were improved. The glass transition temperatures (Tg) of the polymers were about 244-283°C. The 10% weight loss of polymers as a main criterion for their thermal stability was about 420-453°C. Char yield of the polymers at 600°C was in the range of 49-71%. High thermal stability resulted from incorporation of imide backbone, phenylation of chain, symmetry of structures to avoid the weak linkages. The polymers revealed good solubility in dipolar aprotic solvents such as Nmethyl- 2-pyrrolidone, N,N-dimethylacetamide, dimethylformamide, dimethylsulphoxide and also m-cresol. Improved solubility was attributed to the presence of pyridine polar unit and amide structures in the polyimide backbones.

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APA: Copy

TAREMI, F., MAHDIPOUR ATAEI, SH., & MAHMOUDI, ALI. (2010). SYNTHESIS AND PROPERTIES OF NEW HEAT-RESISTANT PYRIDINE-BASED POLYIMIDES CONTAINING PREFORMED AMIDE UNITS. IRANIAN POLYMER JOURNAL (ENGLISH), 19(11 (125)), 875-883. SID. https://sid.ir/paper/571704/en

Vancouver: Copy

TAREMI F., MAHDIPOUR ATAEI SH., MAHMOUDI ALI. SYNTHESIS AND PROPERTIES OF NEW HEAT-RESISTANT PYRIDINE-BASED POLYIMIDES CONTAINING PREFORMED AMIDE UNITS. IRANIAN POLYMER JOURNAL (ENGLISH)[Internet]. 2010;19(11 (125)):875-883. Available from: https://sid.ir/paper/571704/en

IEEE: Copy

F. TAREMI, SH. MAHDIPOUR ATAEI, and ALI MAHMOUDI, “SYNTHESIS AND PROPERTIES OF NEW HEAT-RESISTANT PYRIDINE-BASED POLYIMIDES CONTAINING PREFORMED AMIDE UNITS,” IRANIAN POLYMER JOURNAL (ENGLISH), vol. 19, no. 11 (125), pp. 875–883, 2010, [Online]. Available: https://sid.ir/paper/571704/en

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