Bourguignon Maxime, Thomassin Jean-Michel, Grignard Bruno, Vertruyen Bénédicte, Detrembleur Christophe
Center for Education and Research on Macromolecules (CERM), CESAM Research Unit, University of Liege, Chemistry Department, Sart-Tilman B6A, Liege, 4000, Belgium.
GREENMAT, CESAM Research Unit, University of Liege, Chemistry Department B6a, Liege, 4000, Belgium.
Macromol Rapid Commun. 2021 Feb;42(3):e2000482. doi: 10.1002/marc.202000482. Epub 2020 Oct 12.
Polyurethane hydrogels are attractive materials finding multiple applications in various sectors of prime importance; however, they are still prepared by the toxic isocyanate chemistry. Herein the facile and direct preparation in water at room temperature of a large palette of anionic, cationic, or neutral polyurethane hydrogels by a non-isocyanate route from readily available diamines and new hydrosoluble polymers bearing cyclic carbonates is reported. The latter are synthesized by free radical polymerization of glycerin carbonated methacrylate with water-soluble comonomers. The hydrogel formation is studied at different pH and its influence on the gel time and storage modulus is investigated. Reinforced hydrogels are also constructed by adding CaCl to the formulation that in-situ generates CaCO particles. Thermoresponsive hydrogels are also prepared from new thermoresponsive cyclic carbonate bearing polymers. This work demonstrates that a multitude of non-isocyanate polyurethane hydrogels are easily accessible under mild conditions without any catalyst, opening new perspectives in the field.
聚氨酯水凝胶是一种有吸引力的材料，在各个至关重要的领域有多种应用；然而，它们仍然是通过有毒的异氰酸酯化学方法制备的。本文报道了一种简便直接的方法，即在室温下于水中，通过非异氰酸酯路线，由易得的二胺和带有环状碳酸酯的新型水溶性聚合物制备大量阴离子、阳离子或中性聚氨酯水凝胶。后者是通过甘油碳酸化甲基丙烯酸酯与水溶性共聚单体的自由基聚合反应合成的。研究了在不同pH值下的水凝胶形成过程，并考察了其对凝胶时间和储能模量的影响。通过向配方中添加CaCl₂原位生成CaCO₃颗粒，还构建了增强水凝胶。热响应性水凝胶也是由新型含热响应性环状碳酸酯的聚合物制备的。这项工作表明，在温和条件下无需任何催化剂即可轻松制备多种非异氰酸酯聚氨酯水凝胶，为该领域开辟了新的前景。
