【摘要】 目的利用玉米全粉与聚乙烯醇（PVA）制备共混膜,研究其性能结构,以期替代传统塑料包装袋,缓解白色污染的危害。方法在三乙醇胺和羧甲基纤维素的作用下通过溶液浇铸法制备玉米全粉/PVA共混膜,考察PVA含量对共混膜力学性能、吸湿性能及水蒸气透过性能的影响。结果共混膜的拉伸强度、断裂伸长率和撕裂强度均随PVA含量的增加而升高,吸湿率和水蒸气透过率随PVA含量的增加而降低,吸水后共混膜的力学性能有所下降,显微观察表明,PVA含量的增加可提高共混系统的相容性,PVA在原料基体中质量分数为40%⁶0%时的共混膜拉伸强度可达10 MPa以上,吸湿率小于82%,水蒸气透过率约为12×10^-5 g/（mm·d）。结论该共混膜有一定抗水蒸气和油渗透的功能,基本可满足普通包装材料的要求。更多还原

【Abstract】 The work aims to prepare the blending film with whole corn flour and polyvinyl alcohol（PVA） and study its performance structure, expecting to replace the traditional plastic packaging bags to alleviate the harm caused by white pollution. The whole corn flour/PVA blending films were prepared in solution casting method with triethanolamine and carboxymethylcellulose. The influence of PVA content on mechanical properties, hygroscopicity and water vapor transmission rate of blending films were studied. The results showed that tensile strength, elongation at break and tear strength of blending films strengthened and the moisture absorption and water vapor transmission rate decreased with the increase of PVA content. The mechanical properties of blending films declined after moisture absorption. Microscopic observation indicated that the increase of PVA content could improve the compatibility of the blending system. The blending film containing 40% ⁶0% （mass fraction） PVA in the raw material substrate had a tensile strength of above 10 MPa, moisture absorption of below 82% and water vapor transmission rate of about 12×10^-5 g/（mm·d）. The blending films have certain ability to resist the water vapor and oil permeability, which can basically meet the requirements of ordinary packaging materials.更多还原