水性PU含有羧基,平時得以形成穩定水相分散液;反應時成為架橋位置所在。Polyaziridines(具有三官能基,或雙官能基的aziridines)會優先和羧基反應,在pH>8.5時水性PU與Polyaziridines混合形成一種穩定而且是單液架橋型的水性PU分散液。其架橋條件隨著pH值和溫度而變化。PU的性質藉由所加入的Polyaziridines型態不同,而有所改變,可由抗張強度伸長率,接觸角吸水性,動態機械分析,粒徑分布,螢光光譜等結果得到證明: PU的架橋性質和aziridines的結構有很大的關連性。 Carboxylic acids functional groups exists in aqueous- based PU dispersions which served as the hydrophilic centers as well as the curing sites of PU before and after the application. Polyaziridines ( such as di-functional or tri-functional aziridines) would become the prime candidates for these curing reactions. The PU dispersions stability of mixed with polyaziridines and forming a stable and curable one-package PU dispersions. The curing conditions were depended on both the pH value and the temperature. The PU properties from various types of polyaziridines were evaluated by tensile strength, elongation, contact angle, water absorption, dynamic mechanical analysis, particle sizer, fluorescence. The result demonstrated that the cured PU properties heavily depended on the structures of aziridines.
第十八屆高分子研討會論文專輯第十一卷第一冊=Proceedings of the 18th ROC Polymer Symposium 1995，頁5-8