戊二醛表面交联改性纤维素膜的研究

Study on Surface Crosslinking Modification of Cellulose Membrane in Presence of Glutaraldehyde

纤维素膜具有可降解的优点,但是同时又存在强度过低的缺点。本研究以LiCl/DMAc体系作为纤维素溶剂,对纤维素浆粕进行溶解并通过相转化法制备了纤维素膜,使用戊二醛对纤维素膜进行表面交联改性,通过研究交联反应时间、交联剂戊二醛浓度和反应温度等条件对纤维素膜力学性能的影响,确定了最佳的交联条件:交联时间为40min,戊二醛质量浓度为5wt%,交联反应温度为70℃。在该条件下的纤维素膜的断裂强度达25.53MPa。交联后纤维素膜的机械性能得到了很大的提高,红外光谱(FT-IR)分析也证实了交联反应的发生。

Cellulose membrane is biodegradable, but its strength is low. In this study, cellulose linter was dissolved in lithi- um chloride/N, N-dimethylacetamide （LiC1/DMAc） used as the solvent for the dissolution of cellulose and the cellulose membranes were prepared by the phase inversion technique. The cellulose membranes were subjected to surface crosslinking modification in presence of glutaraldehyde. The effects of surface crosslinking modification conditions, such as crosslinking time, crosslinking agent concentration and crosslinking temperature, on the mechanical properties of cellulose membranes were studied. The results showed that the breaking strength of cellulose membrane was greatly improved after crosslinking modification with glutaraldehyde. The break strength of modified cellulose membrane was 25.53MPa when the preferable crosslinking conditions were as followed： 40min of reaction time, 5wt% of glutaraldehyde mass fraction, 70℃ of reaction temperature. FT-TR analysis had proved the presence of crosslinking reaction.