Browsing by Author "Ahmad, Sharif"

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    Self-cured polymers from non-drying oil
    (Publishing House of Lviv Polytechnic National University, 2008) Zafar, Fahmina; Syed Marghoob Ashraf; Ahmad, Sharif
    Pongamia glabra seed oil (PGSO) – a nonedible, non-drying oil; a sustainable resource has found application as alkyds, epoxies and polyesteramides in paints and coatings. Generally, PGSO based polymeric coatings are obtained by curing at elevated temperature. Efforts have been made to cure PGSO at room temperature by simple route modification. Self-cured Pongamia glabra oil based polyesteramide (APGPEA) resin was synthesized by the reaction between Pongamia glabra oil modified fatty amide diol (HEPGA) with poly(styrene-co-maleic anhydride) (SMA). After complete synthesis of APGPEA, phthalic anhydride modified polyesteramide (APGPEAPh) was synthesized in situ by a minor addition of phthalic anhydride (PA) to APGPEAin order to improve the performance of the latter. The effect of the SMA and PA introduction on properties of PGPEAPh film was also investigated. The physicochemical characteristics of both resins were obtained by standard laboratory methods. The structural elucidation of these resins was carried out by FT-IR, 1H-NMR and 13C-NMR spectral techniques. The thermal behavior was studied by TGA. Curing was studied by DSC and FT-IR techniques. It was observed that APGPEA and APGPEAPh resins significantly improve the drying property in contrast to the previously reported polyesteramides cured at high temperature. Physico-mechanical and chemical/corrosion resistance tests of APGPEAPh coatings showed that the presence of phthalic anhydride in APGPEA enhanced the physico-mechanical and corrosion resistance considerably. The APGPEAPh resin appears to be a sustainable aspirant biomaterial for anticorrosive surface coatings which may substitute polymers obtained from petroleum, potentially scarce resource. Нехарчова, невисихаюча олива Pongamia glabra (ПГО) знаходить застосування для одержання алкідів, епоксидів і поліестерамідів, які використовуються при виробництві фарб і покриттів. Самоструктуруюча поліестерамідна смола на основі ПГО була синтезована за реакцією ПГО, модифікованої жирним амідним діолом з полікополімером на основі стиролу і малеїнового ангідриду. Синтезовано також поліестерамід, модифікований фталевим ангідридом. Для обох смол стандартними методами визначено їх фізико-хімічні характеристики з використанням Фур'є-спектроскопії, 1Н-ЯМР і 13С-ЯМР. Встановлено, що синтезовані смоли мають кращі властивості порівняно з поліестерамідами, затвердженими при високих температурах. Показано, що присутність фталевого ангідриду значно покращує фізико-механічні і корозійні властивості покрить.