氨基聚硅氧烷接枝改性纤维素膜对其结构和性能的影响

采用氢氧化锂/尿素/水溶液作为溶剂,通过冷冻-解冻配置稳定的纤维素溶液并制备纤维素膜.利用高碘酸钠选择性氧化纤维素葡萄糖单元临近的两个羟基制备出二醛纤维素,然后用氨基聚硅氧烷对其进行改性制备出憎水性复合纤维素膜.通过傅立叶红外光谱仪、扫描电镜、热重分析、接触角测定和溶胀率测定等表征氧化纤维素和憎水性复合纤维素的结构和性能.研究了不同质量分数的高碘酸溶液对纤维素的氧化程度以及对纤维素膜的结构的影响,通过改变氨基聚硅氧烷的摩尔浓度来制备不同接枝度的憎水性复合纤维素.结果表明,二醛纤维素具有很强的反应活性,改性纤维素膜的憎水性得到明显提高.在纤维素改性及功能化材料制备的研究中,较强的反应活性使其可以应用在更多的领域.

Structure and Properties of the Cellulose Film Grafted with Silicone

By using lithium hydroxide/urea/water as solvent for native cellulose dissolving, a stable cellulose solution had been obtained by using freeze-thaw. Then the cellulose film was prepared from this solution. NaIO4 was used to selectively oxidize the hydroxyl groups of cellulose to prepare the dialdehyde cellulose. Then the dialdehyde cellulose reacted with silicone and the hydrophobic compound cellulose film materials were prepared. Fourier transform infrared spectroscopy, scanning electron microscopy, thermal gravimetric analysis, contact angle measurements and swelling rate measurement were used to characterize the structure and properties of oxidized cellulose, hydrophobic compound cellulose films and the prepared oxidized cellulose with different degree of oxidation by changing the concentration of NaIO4. The hydrophobic compound cellulose film with different degree of grafting was obtained by changing the concentration of silicone. Dialdehyde cellulose had a strong reactivity.