申请人:THE BOARD OF TRUSTEES OF THE UNIVERSITY OF ILLINOIS
公开号:US20190092898A1
公开(公告)日:2019-03-28
The present invention relates to polymers having dynamic urea bonds and more specifically to polymers having hindered urea bonds (HUBs) with fast hydrolytic kinetics. These urea bonds are aryl-substituted, i.e. aromatic-substituted hindered urea bonds, that demonstrate pH independent hydrolytic kinetics, such that they consistently and rapidly hydrolyze in water from pH 2 to 11. The urea bond dissociation for these materials is generally such that k
−1
>h
−1
, which is two orders of magnitudes faster than for aliphatic hindered ureas. The present invention also relates to hydrolytically reversible or degradable linear, branched or network polymers incorporating these HUBs and to precursors for incorporation of these HUBs into these polymers. The technology can be applied to and integrated into a variety of polymers, such as polyureas, polyurethanes, polyesters, polyamides, polycarbonates, polyamines, and polysaccharides to make linear, branched, and cross-linked polymers. Polymers incorporating these HUBs can be used in a wide variety of applications including for example, environmentally compatible packaging materials and biomedical applications, such as drug delivery systems and tissue engineering. In other embodiments, the HUBs can be used in self-healing polymers.
本发明涉及具有动态脲键的聚合物,更具体地涉及具有阻碍脲键(HUBs)并具有快速水解动力学的聚合物。这些脲键是芳基取代的,即芳基取代的阻碍脲键,表现出pH无关的水解动力学,因此它们在pH 2至11的水中始终快速水解。这些材料的脲键解离通常是k−1>h−1,比脂肪族阻碍脲酰快两个数量级。本发明还涉及水解可逆或可降解的线性、支化或网络聚合物,其中包含这些HUBs,并涉及用于将这些HUBs纳入这些聚合物中的前体。这项技术可以应用和整合到各种聚合物中,如聚脲,聚氨酯,聚酯,聚酰胺,聚碳酸酯,聚胺,聚糖等,以制备线性、支化和交联聚合物。包含这些HUBs的聚合物可以用于各种应用,例如,环境兼容的包装材料和生物医学应用,如药物传递系统和组织工程。在其他实施例中,这些HUBs可以用于自修复聚合物中。