不同辛烯基琥珀酸木薯淀粉酯(OSCS)与壳聚糖质量比对OSCS与壳聚糖-ZnO复合薄膜性能的影响

The Effects of the Octenyl Succinate Cassava Starch Ester(OSCS)/Chitosan Mass Ratio on the Properties of OSCS-Chitosan-ZnO Composite Films

以壳聚糖和辛烯基琥珀酸木薯淀粉酯(OSCS)为主要成膜基质,甘油为增塑剂、纳米ZnO为增强剂,研究不同OSCS/壳聚糖质量比对薄膜的性能变化。首先制备采用石油醚脱脂和碱法提取木薯淀粉,随后将木薯淀粉改性成OSCS。使用溶液共混法制膜,将壳聚糖溶液、OSCS糊化液及纳米ZnO均质混合,然后超声脱气,烘干成膜。分析不同OSCS/壳聚糖质量比对复合膜力学性能、吸水性、水蒸气透过系数和不透明度的影响。当OSCS/壳聚糖的质量比为1:1时,所得膜的力学性能最佳,抗拉强度为13.85 MPa,断裂伸长率为46.57%。吸水性和水蒸气透过系数随着OSCS和壳聚糖的质量比增加呈现上升的趋势,不透明度呈现先下降后上升的趋势,而OSCS/壳聚糖质量比为1.5:1时不透明度最低为1.56 A/mm。红外光谱证明不同OSCS/壳聚糖质量比的薄膜只是通过简单的物理混合,并无新化学键的产生,并且OSCS/壳聚糖的质量比为1:1时,热性能最佳,玻璃态转化温度最高为102.03℃。综合研究,OSCS/壳聚糖的质量比为1:1,整体性能较优,为辛烯基琥珀酸淀粉酯与多糖类复合提供理论基础。

Octenyl succinate cassava starch ester(OSCS)-chitosan-ZnO composite films were prepared using OSCS and chitosan as the film-forming matrix,glycerol as the plasticizer,and ZnO nanoparticles(nano-ZnO)as the reinforcing agent.The effects of the OSCS/chitosan mass ratio on the mechanical performance,water absorption rate,water vapor permeability(WVP),and opacity of the composite film were then analyzed.First,cassava starch was extracted via the petroleum ether degreasing and alkaline extraction processes,and the extracted cassava starch was then modified into OSCS.Following homogeneous blending of the gelatinized OSCS solution with a chitosan solution and ZnO nanoparticles,ultrasonic degassing,and oven drying,an OSCS-chitosan-ZnO film was created.An OSCS/chitosan mass ratio of 1:1 was found to be optimal for mechanical performance,as the resulting film had a tensile strength of 13.85 MPa and an elongation-at-break of 46.57%.As the OSCS/chitosan mass ratio increased,the water absorption rate and WVP increased,while opacity initially decreased and then increased.Opacity reached a minimum of 1.56 A/mm when the OSCS/chitosan mass ratio was 1.5:1.Infrared spectroscopy of films with different OSCS/chitosan mass ratios,revealed that the films were simple physical blends,because altering the mass ratio did not result in the formation of new chemical bonds.Furthermore,an OSCS/chitosan mass ratio of 1:1 optimized thermal performance,as it yielded the highest glass transition temperature of 102.03.In summary,th℃e optimal OSCS/chitosan mass ratio is 1:1,as this provides the best overall performance.These findings will hopefully act as an emperical foundation for the formulation of OSCS-polysaccharide films.