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G. ) and high versatility in chemical structures [1-2]. Polyurethane is generally synthesized from the isocyanate reaction with polyol. Polypropylene glycol (PPG) is a polyol, is basically derived from the petrochemical industry [3]. High rising costs of petrochemical feedstock’s and enhanced public desire for environmentally friendly green products, utilization of renewable resources to manufacture the rigid polyurethane is a work necessary at the present time [4-6]. Castor oil is one of the major natural vegetable oil that contains a hydroxyl group and so it is widely used in many chemical industries, especially in the production of polyurethanes [10].

Cabulis, K. Gromilova, V. Tupureina, and A. Grigalovica, International Journal of Polymer Science. 2013 (2013) Article ID 834595, 1-8. [6] G. C. Ronda, M. Galia and V. Cadiz, J. Materials today. 16 (2013) 337-343. [7] K. C. Pradhan and P. L. Nayak, J. Advances in Applied Science Research. 3 (5) (2012) 30453052. T. S. L. U. Q. Lin, J. of polymers and the environment. 20 (1) (2012) 230. [9] P. Rojek and A. , J. of Applied Polymer Science. 125 (4) (2012) 2936-2945. [10] O. Saravari and S. Praditvatanakit, J.

Experimental Raw materials and reagents. , Ltd. 1. The sodium hydroxide and sodium silicate were provided by Tianjin Fuchen chemical reagents factory, both of them are analytical-reagent. And the chemically-pure sulphuric acid was obtained from Fuzhou chemical engineering research institute. Advanced Materials Research Vol. 1 The morphology of α-Al2O3 (a:×500; b:×10000) Preparation process. Measured 25 g α-Al2O3 and added it to 100 mL distilled water as the reaction mother liquor. The suspending liquid was heated and stirred in certain temperature.

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