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以茶叶中浸提的茶单宁为原料 ,合成了生物降解型聚氨酯泡沫材料 ,并考察了它对NH4 Cl包覆的控制缓释性能。在模拟自然界雨淋的作用下 ,释放曲线大致呈抛物线型。对该材料的机械强度做了拉伸实验 ,表明茶单宁在聚氨酯网络中起交联作用 ,增加了其强度 ,该聚合物可用作包装材料。通过三方面的实验 (碱煮 ,微生物侵蚀及酶水解 )定性地说明了茶单宁聚氨酯比普通聚氨酯易于生物降解 ,并通过D .S .C谱图对其原因做了初步探讨。
Using tea tannin leached from tea as raw material, a biodegradable polyurethane foam was synthesized and the controlled release properties of NH4Cl coating were investigated. In the simulation of natural rain, the release curve is roughly parabolic. Tensile testing was done on the mechanical strength of the material, indicating that tannin acts as a crosslinking agent in the polyurethane network, increasing its strength, which can be used as a packaging material. Through three experiments (alkaline boiling, microbial attack and enzymatic hydrolysis) qualitatively, tea tannin polyurethane is easier to be biodegraded than ordinary polyurethane, and the reason is preliminarily discussed through D.S.C spectrum.