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Download Advanced Materials and Engineering by Taufiq Yap Yun Hin PDF

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By Taufiq Yap Yun Hin

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A. Petroleum based polyurethanes are contributing major portions in the world requirement. To overcome the environmental issues and price adaptability, there is always a massive demand of utilization of renewable resources for polyurethane synthesis with comparable physico-chemical properties. Castor oil is the only major natural vegetable oil that contains a hydroxyl group (-OH) and unsaturated double bonds (C=C) in its organic chain and therefore can be employed with or without modification due to the excellent properties derived from the hydrophobic nature of triglycerides.

Study preparation ,diagnosis from castor oil exhibited increasing of diisocyanate groups, in relation to polyol amount, has increasing of 40 Advanced Materials and Engineering diisocyanate groups, in relation to polyol amount, has increased the strength at rupture of the obtained polymers and has decreased the polymers elongation, which has resulted into a modulus increasing [11]. , examines a series of 1,4-butane diol chain extended polyurethane nanocomposites based on castor oil, and 4,40-diphenylmethane diisocyanate (MDI) were synthesized with modified clay (Cloisite 30B) as filler [12].

C. Sherrington, L. Tetley, Synthesis of Ultrahigh Surface Area Monodisperse Porous Polymer Nanospheres, Macromolecules 39 (2006) 5381-5384. [15] Q. Wu, H. H. Han, et. al. Transesterification of Cottonseed oil catalyzed by bronsted acidic ionic liquids, Ind. Eng. Chem. Res. 46 (2007) 7955-7906. J. Earl, S. B. Carl, et. al. Catalystic nitration of aromatics by ionic liquid, CN1469859A, 2004. [17] F. Y. B. Zhang, et. al. Protophilic amide ionic liquid assisted esterification and catalysis mechanism, J.

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