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首页> 外文期刊>Journal of Applied Polymer Science >Thermal and Thermomechanical Properties of Hyperbranched Polyurethane-Urea/Cenosphere Hybrids
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Thermal and Thermomechanical Properties of Hyperbranched Polyurethane-Urea/Cenosphere Hybrids

机译：超支化聚氨酯-尿素/空心球杂化体的热力学性质

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摘要

Hyperbranched polyurethane (HBPU)-urea/cenosphere hybrid coatings were synthesized by incorporating various concentrations of cenosphere into HB polyester matrix by ultrasonication technique, and this polyester was further used for the preparation of isocyanate terminated HBPU prepolymers by reacting with excess isophorone diisocyanate (IPDI) in a NCO/OH ratio of 1.6 : 1. The desired hybrid coating is obtained by moisture curing the excess NCO present in the prepolymer through film casting. The structure of the hyperbranched polyester (HBPE) was conformed by H-1, C-13 NMR and FT R spectroscopy and the degree of branching (DB) was calculated using Frechet and Frey equations. These hybrid films were characterized by powder XRD, FTIR, SEM, DMTA, and TGA. The structure property correlation, intermolecular/intramolecular hydrogen bonding, the surface morphology, and viscoelastic properties were studied. These results showed an increase in T-g and thermal stability of the hybrid coatings than the base polymer. (C) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 110: 4022-4033, 2008
机译：通过超声技术将各种浓度的空心球掺入HB聚酯基体中，合成了超支化聚氨酯（HBPU）-脲/空心层杂化涂料，并将该聚酯与过量的异佛尔酮二异氰酸酯（IPDI）反应，进一步用于制备异氰酸酯封端的HBPU预聚物。 NCO / OH比为1.6：1。所需的杂化涂料是通过流延薄膜成型法对预聚物中存在的过量NCO进行湿固化而获得的。通过H-1，C-13 NMR和FT R光谱对超支化聚酯（HBPE）的结构进行拟合，并使用Frechet和Frey方程计算支化度（DB）。这些混合膜的特征在于粉末XRD，FTIR，SEM，DMTA和TGA。研究了结构性质的相关性，分子间/分子间氢键，表面形态和粘弹性。这些结果表明，与基础聚合物相比，杂化涂层的T-g和热稳定性有所提高。 （C）2008 Wiley Periodicals，Inc. J Appl Polym Sci 110：4022-4033，2008

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