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        The Antihydrolytic Effect and Properties of Crosslinked Polyurethane Containing Natural Dimer Fatty Acids Building Blocks

        Xin Liu,Kai Xu,Huan Liu,Hualun Cai,Zien Fu,Ying Guo,Mingcai Chen 한국고분자학회 2012 Macromolecular Research Vol.20 No.6

        Four series of cross-linked polyurethanes with polyester polyols as soft segments were prepared by selfcuring of isocyanate-terminated polyurethanes. Polyester polyols herein were derived from different dimer fatty acids weight content, such as dicarboxylic acid leading to various hydrophobicity and steric hindrance. The structure of cross-linked polyurethane was characterized by Fourier transform infrared spectroscopy (FTIR). The surface properties and mechanical and thermal properties of cross-linked polyurethane were investigated using contact meter, tensile tester, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The results indicated that with increasing dimer fatty acid weight content from 0% to 100%, the cross-linked polyurethanes exhibited increased hydrophobicity (water contact angle increased from 91o to 96o), improved water resistance (water uptake decreased from 1.41% to 0.34%), toluene resistance (weight loss decreased from 33.2% to 22.7%), and hydrolytic resistance (weight loss decreased from 0.60% to 0.27%), enhanced mechanical properties (tensile strength increased from 1.3 to 4.8 MPa), and thermal stability (decomposition temperature of 50% weight loss increased from 425 to 462 oC).

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