PLA/MRPs乳液膜的制备及性能研究

Preparation and Properties of PLA/MRPs Emulsion Film

关键词:  MRPs  Pickering乳液聚合  抗氧化性能  力学性能

Key Words:MRPs  Pickering emulsion polymerization  oxidation resistance  mechanical properties

摘要:以碱溶性半纤维素木聚糖和玉米醇溶蛋白合成的美拉德反应产物（MRPs）纳米颗粒水溶液为水相、聚乳酸/二氯甲烷溶液（PLA/DCM）为油相，通过乳液聚合法和模压成型工艺制备了PLA/MRPs乳液膜。分别利用傅里叶变换红外光谱仪、热重分析仪、扫描电子显微镜和紫外可见吸收光谱仪分析了PLA/MRPs复合材料的形貌结构和抗氧化性能，并对PLA/MRPs乳液膜的力学性能进行了探究。探讨了MRPs纳米颗粒水溶液的质量分数对PLA/MRPs乳液膜的抗氧化性能和力学性能的影响。结果表明，制得的PLA/MRPs复合材料具有水包油型结构，以质量分数0.50%MRPs制备的PLA/MRPs乳液膜在反应时间为30 h后，DPPH自由基清除率最大，为26.55%；而随着MRPs质量分数的增加，PLA/MRPs乳液膜的拉伸强度和断裂伸长率逐渐降低。

Abstract:Maillard reaction products （MRPs） were prepared by reaction between alkali-soluble hemicellulose xylan and zein， then Pickering emulsion polymerization and compression molding method were used to prepare PLA/MRPs emulsion films， in which MRPs nanoparticles solution was as water phase， and PLA/DCM was as oil phase. The morphology， antioxidant properties and mechanical properties of the films were measured by using Fourier transform infrared （FT-IR）， thermogravimetric analysis （TG）， scanning electron microscope （SEM）， uv-vis absorption spectra and universal testing machine respectively. Effects of dosage of MRPs nanoparticles solution on antioxidant and mechanical properties of PLA/MRPs emulsion films were discussed. The results indicated that PLA/MRPs composite materials were oil-in-water structure， and after 30 h test， DPPH free radical scavenging rate of PLA/MRPs emulsion films prepared with 0.50% MRP reached maximum level of 26.55%. However， tensile strength and elongation at break of PLA/MRPs emulsion films decreased with the increase of MRPs dosage.