淀粉/壳聚糖/聚乙烯醇/明胶共混膜的制备及表征

Preparation and Characterization of CST/CS/PVA/GEL Blend Membrane

制备了淀粉(CST)/壳聚糖(CS)/聚乙烯醇(PVA)/明胶(GEL)共混膜,测定了其透光性、透水汽性、吸水性及保水性;通过红外光谱(FT-IR)、X射线衍射(XRD)表征了聚乙烯醇-壳聚糖(PVA-CS)、聚乙烯醇-明胶(PVA-GEL)、聚乙烯醇-淀粉(PVA-CST)共混膜的特性。结果表明,PVA、CS、GEL与CST之间具有较强的相互作用。CS、GEL和CST的加入使PVA的结晶度降低。当CS/PVA/GEL/CST质量比为2/2/1/5%时,透光率最大,为86.7%;当CS/PVA/GEL/CST质量比为2/2/1/25%时,透水汽率最大,为1317.921g/m2;当CS/PVA/GEL/CST质量比为2/2/1/25%时,吸水率最大,为971.1%;当CS/PVA/GEL/CST质量比为3/1/1/5%时,保水率最大,为1168.9%。

The four components blend membrane which has been developed based on chitosan（CS） blended with polyvinyl chloride（PVA）,gelatin（GEL） and cassava stareh（CST）was prepared . And the transmission of light, air permeability, water absorption, water retention were tested. The Fourier transform infrared spectroscopy, X-ray were used to characterize the blend membranes of PVA-CS, PVA-GEL, PVA-CST. The experimental results demon- strate that there has some stronger interaction between PVA, CS, GEL and CST. While mixed with CS, GEL and CST, the PVA exhibited lower crystallinity. When the ratio of CS ： PVA ： GEL ： CST is 2 ： 2 ： 1 ： 5%, the light transmittance take the maximum, is 86.7%. When the ratio of CS ： PVA ： GEL ： CST is 2 ： 2 ： 1 ： 25%, the air per- meability take the maximum, is 1371. 921g/mz. When the ratio of CS ： PVA ： GEL ： CST is 2 ： 2 ： 1 ： 25%, the wa- ter absorption take the maximum, is 971.1%. When the ratio of CS ： PVA ： GEL ： CST is 3 ： 1 = 1 ： 5%, the water retention take the maximum, is 1168. 9%.