微晶纤维素/聚乙烯醇对明胶基复合薄膜性能的影响

Effect of Microcrystalline Cellulose/Polyvinyl Alcohol on Properties of Gelatin Based Composite Films

聚乙烯醇(PVA)/明胶基材料具有良好的成膜性能和生物相容性,具有广泛的实际应用价值,是一个重要的研究对象。本研究将微晶纤维素(MCC)和PVA分别作为增强材料和共混材料添加到明胶(GL)基材中,改善明胶基复合薄膜的力学性能和阻隔性能。微晶纤维素的添加可赋予MCC/PVA/GL复合薄膜良好的理化性能和应用性能。当基材中添加质量分数5%MCC时,复合薄膜的拉伸强度由14.91 MPa提高到48.02 MPa,热降解温度提高了11.4℃,含水率降低了9.12%。同时,还延长了水蒸气通过PVA/GL薄膜的路径,降低了MCC/PVA/GL复合薄膜的水蒸气透过率。土壤包埋实验表明,MCC的加入加快了复合薄膜的生物降解性能。因此,MCC/PVA/GL复合薄膜可应用于绿色包装领域,如食品包装、药品包装、化妆品包装等。

Polyvinyl alcohol(PVA)/gelatin based materials had good film forming properties and biocompatibility,and had widely practical application value,which was an important research target.In this study,microcrystalline cellulose(MCC)and PVA were added to gelatin(GL)substrate as reinforcing materials and blending materials,respectively,to improve the mechanical properties and barrier properties of gelatin matrix composite films.The addition of microcrystalline cellulose improved the physicochemical properties and application properties of MCC/PVA/GL composite films.When 5%MCC is added to the substrate,the tensile strength of the composite film increases from 14.91 MPa to 48.02 MPa,the thermal degradation temperature increases by 11.4℃,and the water content decrease by 9.12%.At the same time,the path of water vapor through the PVA/GL film is prolonged,and the water vapor transmission rate of the MCC/PVA/GL composite film is reduced.Soil embedding experiments show that the addition of MCC accelerates the biodegradability of the composite films.Therefore,MCC/PVA/GL composite film can be applied to the field of green packaging,such as,food packaging,pharmaceutical packaging,cosmetic packaging and so on.