羧甲基纤维素-壳聚糖共混膜的性能表征  

Characterization of Chitosan-carboxymethyl Cellulose Blended Membrane

作　　者：张锐[1] 方桂珍[1] 马英梅[1] 马艳丽[1] 

机构地区：[1]东北林业大学生物质材料科学与技术教育部重点实验室,黑龙江哈尔滨150040

出　　处：《林产化学与工业》2010年第1期43-48,共6页Chemistry and Industry of Forest Products

基　　金：高等学校博士学科点专项科研基金资助项目(20060225008);东北林业大学研究生科技创新项目(无编号)

摘　　要：通过共混的方法制备了3种不同质量比（1：2、1：1、2：1）的羧甲基纤维素一壳聚糖（CMC-CS）共混膜，利用IR和扫描电镜（SEM）对膜进行结构表征，用差示扫描量热法（DSC）考察了CMC-CS共混膜的热稳定性，研究了共混膜的均匀性、耐酸性、拉伸强度和溶胀性，并对分子间的作用机理进行探讨。结果表明，CMC与CS混合时，存在静电作用与氢键作用，生成了聚电解质复合物；在170～330℃，共混膜分子间发生降解，在217．4℃时离子键断裂，静电作用消失；经分析当CMC与CS比例为1：1时，膜性能最好，共混膜的静电作用最大，拉伸强度可达34．44MPa，比CS单膜拉伸强度提高了64．47％；CMC的加入，使得酸性适用范围下限由CS膜的pH值5降至4，在pH值6中浸泡一段时间后，测得拉伸强度为25．71MPa；CMC—CS膜的吸水溶胀性显著降低。Carboxymethyl cellulose-chitosan （CMC-CS） blended membranes with different weight ratios （1：2, 1 ： 1, 2：1 ） were prepared by co-solution method. The structure of membranes was characterized by FT-IR and SEM. The thermal property of membranes was characterized by DSC. The properties of CMC-CS were evaluated by uniformity, acid resistance, tensile strength and absorption rate. The intermolecular mechanism was analyzed. The results indicated that CMC and CS generated polyelec- trolyte through electrostatic and hydrogen-bond interactions. The intermolecule bonds of CMC-CS membranes were degraded between 170 ~C and 330 ~C. At 217.4 ~C, the ionic bonds were fractured and the electrostatic interaction disappeared. The CMC-CS membrane with a weight ratio of 1 ： 1 was the ideal membrane, whose electrostatic interaction between CS and CMC was the highest. Tensile strength of the CMC-CS membrane reached 34.44 MPa, which was 64.47 % higher than CS membrane. The maximal acid adaptability was decreased from pH value 5 to 4, and tensile strength of CMC-CS membrane was 25.71 MPa after dunking at pH value 6. The water-swelling rate of CMC-CS membranes was effectively reduced.

关 键 词：羧甲基纤维素 壳聚糖 共混膜 

分 类 号：TQ351[化学工程]