Nanostructured hyperbranched polyurethane elastomer hybrids that incorporate polyhedral oligosilsesquioxane

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• 作者：Sibdas Singha Mahapatra¹ ; Santosh Kumar Yadav ; Jae Whan Cho ; ^{jwcho@konkuk.ac.kr}
• 关键词：Hyperbranched polymer ; Hybrids ; POSS ; Mechanical properties
• 刊名：Reactive and Functional Polymers
• 出版年：2012
• 期刊代码：92_13815148
• 类别：ch
• 出版时间：April, 2012
• 卷：72
• 期：4
• 页码：227-232
• 文件大小：1001 K

摘要

Novel thermoplastic hyperbranched polyurethane (HBP) elastomer hybrids containing polyhedral oligomeric silsesquioxane (POSS) have been synthesized using an Ab>2b> + Bb>3b> approach. Different compositions of these hybrid nanomaterials were obtained from reactions of POSS-diol, triethanolamine, poly(蔚-caprolactone)diol, and 4,4鈥?methylenebis(phenyl isocyanate) with a chain extender. The covalent attachment of POSS molecules to the backbone of the polyurethane chain was characterized with FT-IR and NMR spectroscopies. The non-agglomerated homogeneous dispersion obtained through the covalent attachment of POSS molecules and the HBP matrix was observed by SEM imaging. The mechanical properties, including the tensile and yield strengths, Young鈥檚 modulus, and toughness, significantly increased after the introduction of POSS molecules into the hybrids; this increase can be ascribed to the nano-reinforcement effect of the POSS cages and the long-range branched structure of the polymer. Thermogravimetric analyses indicated that the thermal stability of the polymer matrix was improved by the introduction of a small amount of POSS.