阳离子淀粉/羧甲基纤维素钠复合膜的制备及其性能

Preparation and Properties of Cationic Starch/Sodium Carboxymethyl Cellulose Composite Film

以不同用量的3-氯-2-羟丙基三甲基氯化铵(CHPTAC)为改性剂,制备改性度在0.046~0.531的季铵盐阳离子淀粉(CS)。以制备的阳离子淀粉与羧甲基纤维素钠(CMC)为基材,甘油为塑化剂,采用流延法,制备不同配比的CMC/CS复合膜。考察CS与CMC的混合比例对膜液流变性、复合膜理化特性的影响,并用傅里叶红外光谱(FTIR)和X射线衍射(XRD)对制备的淀粉和复合膜进行表征。结果表明,CHPTAC成功接枝到淀粉上,阳离子淀粉的添加可以降低CMC溶液的黏度,提高CMC膜的力学强度、吸水性和阻隔性,且与阳离子淀粉添加量和改性度呈现正相关性,阳离子淀粉对复合膜的颜色有一定的影响,但是差异不显著。因此,阳离子淀粉在制备抗菌、高阻隔、高强度复合包装材料中具有潜在的研究价值。

In this study,3-chloro-2-hydroxypropyl trimethylammonium chloride(CHPTAC)with different concentrations were used as modifier to prepare cationic starch(CS)with a modification degree between 0.046 and 0.531.The obtained cationic starches and sodium carboxymethyl cellulose(CMC)were used as substrate and glycerin as plasticizer,CMC/CS composite films were prepared by flow-casting method.The effects of CS/CMC mixed ratios and degree of modification of starch on rheological properties of film-forming solution and physicochemical properties of composite films were investigated.The prepared starch and composite films were characterized by Fourier transform infrared spectroscopy(FTIR)and X-ray diffraction(XRD).The results show that the CHPTAC is successfully grafted onto starch.Cationic starch addition could reduce the viscosity of CMC solution,and it could improve the mechanical strength,water absorption and barrier property of CMC films.It has a positive correlation with the additive amount and degree of substitution.Cationic starch has a certain influence on the color of the composite membrane,but the difference is not significant.Therefore,cationic starch has potential research value in the preparation of antibacterial,high barrier,high strength composite packaging materials.