Hydrolyzable polyureas bearing hindered urea bonds.

Hydrolyzable polyureas bearing hindered urea bonds.
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DOI:
10.1021/ja5093437
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发表时间:
2014-12-10
影响因子:
15
通讯作者:
Cheng, Jianjun
Cheng, Jianjun
中科院分区:
化学1区
文献类型:
--
作者:
Ying, Hanze;Cheng, Jianjun

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可水解聚合物是一种广泛使用的材料,在生物医学、农业、塑料和包装工业中有着广泛的应用。它们的骨架结构中通常含有酯和其他可水解的键,如酸酐、缩醛、缩醛或亚胺。在这里,我们报告了第一种可水解聚氨酯的设计,它具有动态受阻尿素键(HUBs),可以可逆地解离成大块胺和异氰酸酯,后者可以被水进一步水解,驱动平衡,促进聚氨酯的降解。含有1-叔丁基-1-乙基脲键的聚氨酯具有高动态(高键解离率),以线性聚合物或交联凝胶的形式存在,在温和的条件下可以被水完全降解。考虑到聚氨酯生产的简单性和低成本,只需简单地混合多功能大体积胺和异氰酸酯,结构的多功能性,以及轮毂轴承聚氨酯降解轮廓的可调性,这些材料具有非常广泛的应用潜力。
Hydrolyzable polymers are widely used materials that have found numerous applications in biomedical, agricultural, plastic, and packaging industrials. They usually contain ester and other hydrolyzable bonds, such as anhydride, acetal, ketal, or imine, in their backbone structures. Here, we report the first design of hydrolyzable polyureas bearing dynamic hindered urea bonds (HUBs) that can reversibly dissociate to bulky amines and isocyanates, the latter of which can be further hydrolyzed by water, driving the equilibrium to facilitate the degradation of polyureas. Polyureas bearing 1-tert-butyl-1-ethylurea bonds that show high dynamicity (high bond dissociation rate), in the form of either linear polymers or cross-linked gels, can be completely degraded by water under mild conditions. Given the simplicity and low cost for the production of polyureas by simply mixing multifunctional bulky amines and isocyanates, the versatility of the structures, and the tunability of the degradation profiles of HUB-bearing polyureas, these materials are potentially of very broad applications.
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