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PLA/MRPs乳液膜的制备及性能研究 |
Preparation and Properties of PLA/MRPs Emulsion Film |
投稿时间:2020-08-17 |
DOI:10.11980/j.issn.0254-508X.2020.11.004 |
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 |
基金项目:辽宁省教育厅科学研究项目(J2020040);制浆造纸工程国家重点实验室开放基金资助项目(201802)。 |
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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. |
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