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首页> 外文期刊>Journal of Applied Polymer Science >Poly(urethanes) containing silarylene and/or germarylene units
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Poly(urethanes) containing silarylene and/or germarylene units

机译：含亚芳基和/或亚芳基单元的聚氨酯

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A series of 10 poly(urethanes) were synthesized by solution polymerization from bis(chloroformates) and aromatic diamines, containing both silicon or germanium as central atom. So, the polymers prepared contain two silicon atoms or two germanium atoms exclusively or combinations of both. Me, Et, and Ph groups were bonded to the central atoms according to the nature of the monomers employed. Poly(urethanes) were characterized by FTIR, H-1, C-1, and Si-29 NMR spectroscopy and the results agreed with the proposed structures. Additionally, intrinsic viscosity values were established in DMSO solutions and thermal analyses were developed. In all cases, thermostable oligomers were obtained, which showed a degradation process beginning at similar to 240-260 degrees C. Polymers showed a thermal dependence with the nature of the heteroatom employed. Thus, in general, when germanium was used as central atom, the thermal stability was higher than the polymers containing silicon which agrees with the lower polarity and higher energy of the C-Ge bond in comparison with the C-Si one. (C) 2008 Wiley Periodicals, Inc.
机译：通过溶液聚合由双（氯甲酸酯）和芳族二胺合成一系列10种聚氨基甲酸酯，它们都含有硅或锗作为中心原子。因此，所制备的聚合物仅包含两个硅原子或两个锗原子或两者的组合。根据所用单体的性质，Me，Et和Ph基团键合在中心原子上。通过FTIR，H-1，C-1和Si-29 NMR光谱对聚氨酯进行了表征，结果与拟议的结构相符。此外，在DMSO溶液中建立了特性粘度值，并进行了热分析。在所有情况下，均获得了热稳定的低聚物，该低聚物的降解过程始于类似于240-260摄氏度的温度。聚合物表现出对所用杂原子性质的热依赖性。因此，通常，当锗用作中心原子时，其热稳定性高于含硅的聚合物，与C-Si键相比，其具有较低的极性和较高的C-Ge键能量。 （C）2008 Wiley期刊公司

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