PVA/活性炭微胶囊复合膜的制备与性能研究

Study on Properties of PVA/Microencapsulated Activated Carbon Composite Films and Its Preparation

以壳聚糖为壁材、活性炭为芯材,采用乳化-固化法制备了壳聚糖包覆的活性炭微胶囊,并将其与聚乙烯醇(PVA)复合,得到PVA/活性炭微胶囊复合膜。利用光学显微镜、扫描电镜、红外光谱等手段确定了制备微胶囊的最佳工艺参数,并考察了微胶囊用量对PVA复合膜性能的影响。结果表明:当壳聚糖用量为1.5%,乳化剂用量为1.5%,油/水相比为5:1,交联剂用量为1.0 ml,芯壁比为1:2时,可制备出成球效果较好的壳聚糖包覆的活性炭微胶囊;活性炭经壳聚糖包覆后可提高其与PVA的相容性,少量微胶囊的添加即可有效改善PVA复合膜的力学、阻隔等性能。

Taking chitosan as the wall material, activated carbon as the core material, activated carbon microcapsules enveloped by chitosan were prepared using emulsification-curing method, and applied to the preparation of polyvinyl alcohol（PVA）/microencapsulated activated carbon composite films. The optimum process parameters for the preparation of microcapsules were obtained by means of optical microscope（OM）, scanning electron microscope（SEM）, Fourier transform infrared spectroscopy（FTIR）, etc; and the influences of microcapsule content on performances of PVA composite films were also investigated. The results show that： when the contents of chitosan, emulsifier and crosslinking agent are 1.5%, 1.5%, 1.0 ml, and the ratios of oil-water and core-wall are 5：1, 1：2 respectively, smooth activated carbon microcapsules enveloped by chitosan can be prepared. Microencapsulation of activated carbon can increase the compatibility of activated carbon with PVA. The addition of a small amount of microcapsules can improve the performances of PVA effectively, such as mechanics properties, barrier properties, and so on.