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
• 出版时间：April, 2012
• 年：2012
• 卷：72
• 期：4
• 页码：227-232
• 全文大小：1001 K

文摘

Novel thermoplastic hyperbranched polyurethane (HBP) elastomer hybrids containing polyhedral oligomeric silsesquioxane (POSS) have been synthesized using an A₂ + B₃ approach. Different compositions of these hybrid nanomaterials were obtained from reactions of POSS-diol, triethanolamine, poly(¦Å-caprolactone)diol, and 4,4?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¡¯s 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.