Covestro Deutschland AG, CAS Global R&D, Kaiser-Wilhelm-Allee 60, 51373, Leverkusen, Germany.
Technical Medical Centre, Faculty of Science and Technology, Department of Biomaterials Science and Technology, University of Twente, P.O. Box 217, 7500, AE Enschede, The Netherlands.
Macromol Rapid Commun. 2019 May;40(9):e1800867. doi: 10.1002/marc.201800867. Epub 2019 Feb 28.
For the study of polymer networks, having access to polymer networks with a controlled and well-defined microscopic network structure is of great importance. However, typically, such networks are difficult to synthesize. In this work, a simple, effective, and widely applicable method is presented for synthesizing polymer networks with a well-defined network structure. This is done by the functionalization of polymeric diols using a diisocyanate, and their subsequent trimerization. Using hexamethylene diisocyanate and hydroxyl-group-terminated poly(ε-caprolactone) and poly(ethylene glycol), it is shown that both hydrophobic and hydrophilic poly(urethane-isocyanurate) networks with a well-defined network structure can readily be synthesized. By using in situ infrared spectroscopy, it is shown that the trimerization of isocyanate endgroups is clearly the predominant reaction pathway of network formation, supporting the proposed mechanism and network structure. The resulting networks possess excellent mechanical properties in both the dry and in the wet state.
对于聚合物网络的研究来说，获得具有可控且明确微观网络结构的聚合物网络非常重要。然而，通常情况下，这样的网络很难合成。在这项工作中，提出了一种简单、有效且广泛适用的方法，用于合成具有明确网络结构的聚合物网络。这是通过使用二异氰酸酯对聚合物二醇进行官能化，然后进行三聚反应来实现的。使用六亚甲基二异氰酸酯和端羟基封端的聚（己内酯）和聚（乙二醇），可以很容易地合成具有明确网络结构的疏水性和亲水性的聚（异氰脲酸酯-尿烷）网络。通过原位红外光谱，表明异氰酸酯端基的三聚反应是网络形成的主要反应途径，支持了所提出的机制和网络结构。所得网络在干燥和湿润状态下均具有优异的机械性能。
