【摘要】 以玉米淀粉为基质，结合纳米Ti O₂，通过超声分散采用流延法制备了可生物降解的淀粉/Ti O₂纳米复合薄膜，研究了纳米Ti O₂对薄膜拉伸性能、阻隔性能及抗菌活性的影响，采用扫描电子显微镜（SEM）、红外光谱仪（FTIR）和X射线衍射仪（XRD）对复合膜的微观形貌和结构进行了表征。结果表明，淀粉/Ti O₂纳米复合膜中Ti O₂与淀粉分子间存在缔合作用，含适量Ti O₂的复合膜组分之间有良好的相容性，与淀粉膜相比，纳米复合膜的拉伸性能和水蒸气阻隔性能得到有效改善，含0.8%Ti O₂（质量分数，下同）的纳米复合膜拉伸强度为7.54 MPa，比淀粉膜提高了53.9%，水蒸气透过系数为5.50×10^-5 g/（mm·d），较淀粉膜降低了23.5%，该复合膜同时表现出较好的紫外线隔离性能及抗菌活性。更多还原

【Abstract】 TiO₂ nanoparticles were incorporated into corn starch to prepare a series of biodegradable starch/TiO₂ nanocomposite films for food packaging through ultrasonic dispersion and solution casting.The effect of TiO₂ nanoparticles on the mechanical properties,water vapor resistance properties and antibacterial activities of the nanocomposite films were investigated.Scanning electron microscope,infrared spectrometer and X-ray diffractometer were used to characterize the morphology and microstructure of the films.The results indicated that the compatibility of corn starch with TiO₂ nanoparticles was enhanced at a proper addition amount of TiO₂ nanoparticles due to the formation of molecular association.Compared to pure starch film,the nanocomposite films achieved an effective improvement in mechanical performance and vapor barrier property.The nanocomposite film containing 0.8 wt% TiO₂ nanoparticles presented tensile strength of 7.54 MPa and water vapor permeability of 5.50×10^-5g/（mm·d）,which were 53.9% higher and 23.5% lower than those of pure starch film,respectively.The nanocomposite films exhibited a good antimicrobial capability and reduced transmittance of UV light.更多还原