聚氨酯材料表面微波辅助接枝聚乙二醇的研究

Study on the PEG grafting onto the surface of PU assisted by microwave

采用微波辐照辅助技术在聚氨酯膜的表面接枝聚乙二醇,并与传统加热反应接枝聚乙二醇的方法进行对比。结果表明,微波辅助反应能明显加快聚氨酯表面接枝PEG的速度,其接枝效果受微波功率、反应时间以及投料比的影响。在实验条件下,微波功率为100W,反应物的质量分数为5%,反应时间为10min时,微波辅助表面接枝反应效果以及效益最好。SEM和AFM表面分析表明,与传统加热反应方法相比,微波辅助反应对膜表面的破坏程度更小,膜表面更加光滑平整。水接触角的结果也表明,微波辅助反应接枝PEG所得膜表面具有良好的亲水性能。

The PEG was grafted onto the surface of polyurethane membranes using a microwave irradiation technology, which was compared with the conventional heated method. The results showed that microwave could apparently accelerate grafting polymerization of the polyurethane surface. Microwave power, reaction time as well as the mass fraction had influences on grafting effects. In this experiment, the microwave reaction could get thebest efficiency when the microwave power was 100W, the mass fraction 5% and the reaction time 10min. Scan- ning electron microscopy and atomic force microscopy observations displayed that the membrane surface was smoother and in smaller destruction with microwave irradiation than with conventional heated method. The water contact angle data also indicated that the membrane surface had better hydrophilicity after grafting the PEG assisted by microwave.