Abstract
Two new poly(amide-imide)-montmorillonite reinforced nanocomposites containing bis(4-carboxyphenyl)-N,N'-pyromellitimide acid moiety in the main chain were synthesized by a convenient solution intercalation technique. Poly(amide-imide) (PAI) as a source of polymer matrix was synthesized by the direct polycondensation reaction of bis(4-carboxyphenyl)-N,N'-pyromellitimide acid with 4,4'-diamino diphenyl sulfone in the presence of triphenyl phosphite (TPP), CaCl2, pyridine and N-methyl-2-pyrrolidone (NMP). Morphology and structure of the resulting PAI-nanocomposite films with 10 and 20% silicate particles were characterized by FT-IR spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effect of clay dispersion and the interaction between clay and polymeric chains on the properties of nanocomposites films were investigated by using UV-Vis spectroscopy, thermal gravimetry analysis (TGA) and water uptake measurements. KEYWORDS: Bis(4-carboxyphenyl)-N,N'-pyromellitimide acid moiety, Poly(amide-imide)-montmorillonite nanocomposite, Thermal properties Bull. Chem. Soc. Ethiop. 2013, 27(1), 95-104.DOI: http://dx.doi.org/10.4314/bcse.v27i1.10
Highlights
Polymer-clay nanocomposites typically exhibited mechanical, thermal and gas barrier properties, which are superior to those of the corresponding pure polymers [1-9]
In this article two PAI-nanocomposite films with 10 and 20% silicate particles containing chiral bis(4-carboxyphenyl)-N,N'-pyromellitimide acid moiety in the main chain was prepared by using a convenient solution intercalation technique
Bis(4-Carboxyphenyl)-N,N'-pyromellitimide acid 3 was synthesized by the condensation reaction of one equimolar of pyromellitic dianhydride 1 with two equimolar of p-amino benzoic acid 2 in a mixture of acetic acid solution and pyridine (Scheme 1)
Summary
Polymer-clay nanocomposites typically exhibited mechanical, thermal and gas barrier properties, which are superior to those of the corresponding pure polymers [1-9]. In this article two PAI-nanocomposite films with 10 and 20% silicate particles containing chiral bis(4-carboxyphenyl)-N,N'-pyromellitimide acid moiety in the main chain was prepared by using a convenient solution intercalation technique. The water absorption of PAI-nanocomposite films was carried out using a procedure under ASTM D570-81 [24].
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