醋酸纤维素改性制备氨基甲酸酯超滤膜材料的研究

利用尿素对醋酸纤维素（CA）进行浸泡预处理，然后移入邻二甲苯惰性体系中进行反应。探讨合成过程中的影响因素，结果表明：预处理过程中尿素的质量分数为25％，预处理温度55℃，预处理时间5h，反应时间3．5h时，所得醋酸纤维素氨基甲酸酯（CAC）的取代度可达到0．1。FT-IR表征证明成功合成了CAC。用制备的CAC进行铸膜，CAC膜的拉伸强度及水通量要优于CA膜，并且随着取代度的提高，CAC膜的拉伸强度及水通量呈上升趋势。

The Study of Modified Cellulose Acetate to Carbamate as Ultrafiltration Membrane Materials

Using urea to cellulose acetate （CA） for soaking pretreatment, and then transfer CA into o-xylene inert system for reaction. These factors have been explored at the process of synthesis and the results were shown as follows： Pretreatment concentration was 25%, pretreatment temperature was 55℃, pretreatment time was 5 h, and the reaction time was 3.5 h. On this condition, the degree of substitution of CAC was able to be 0. 1. FT-IR characterization proved that the CAC was successful synthesized. Use the CAC and CA for casting film, the tensile strength and water flux of CAC membrane is better than that of CA membrane. The study concluded that with the degree of substitution increases, CAC film tensile strength and water flux shows increase trend.