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摘要本论文以聚乳酸（PLA），聚乙二醇（PEG），纳米氧化镁（MgO），纳米二氧化钛（TiO2）为原料，通过熔融共混，模压成型法制备了PLA/PEG/接枝改性纳米填料复合材料，分别采用傅里叶红外光谱，万能试验机，接触角测试光学显微镜等对接枝改性纳米填料，PLA/PEG/接枝改性纳米填料复合材料的结构，力学性能，亲水性能进行表征，并对纳米复合材料在浓度为1mol/L的NaOH溶液中的降解性能进行初步研究。对纳米复合材料进行性能研究，结果表明：g-MgO的加入能增加PLA/PEG500万的拉伸强度，且当g-MgO的载入比为3wt%时，PLA/PEG500万/g-MgO复合材料拉伸强度最大；g-TiO2的加入能明显增加PLA/PEG500万的强度，且当g-TiO2的载入比为5wt%时，PLA/PEG500万/g-TiO2复合材料拉伸强度最大。相较于载入TiO2而言，载入MgO的PLA/PEG500万复合材料整体性能较差。接触角测试结果表明，g-MgO和g-TiO2都明显提高PLA/PEG体系的亲水性能。在NaOH介质中降解结果表明，纳米复合材料在碱性介质中的降解性能良好。
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关键词： 聚乳酸；聚乙二醇；氧化镁；二氧化钛；降解性能6435
Abstract
In this paper, using polylactic acid (PLA), polyethylene glycol (PEG), nanometer magnesium oxide (MgO), nanometer titanium dioxide (TiO2) as raw material, through melt mixing, molding prepared nanometer composites PLA/PEG/ grafting, respectively by means of Fourier transform infrared spectroscopy, universal testing machine, contact angle measurement of optical microscopy on grafting modified nanometer fillers, the mechanical properties of nanometer filler composite PLA/PEG/ grafted with hydrophilic properties, structure, characterization, and the nanometer composite material for preliminary research for the degradation of NaOH solution of 1mol/L concentration in the. Performance study of nanometer composite material, results showed that: grafting modification and the addition of MgO can increase the intensity of PLA/PEG500W, and when the addition amount of modified MgO ratio was 3wt%, the maximum tensile strength of PLA/PEG500W/g-MgO composites; grafting modification and the addition of TiO2 can significantly increase the strength of PLA /PEG500W, and when the graft modification of TiO2 the added mass ratio was 5wt%, the maximum tensile strength of PLA/PEG500W/g-TiO2 composites. Compared to the load TiO2, the overall performance of PLA/PEG500W composite material is poor in MgO. The test results show that the contact angle, graft modification of MgO and TiO2 obviously improve the hydrophilicity of PLA/PEG system. In the medium of NaOH degradation results showed that, nanometer composite material degradation in alkaline medium good.
Keywords: Polylactic Acid; Polyethylene Glycol; Magnesium Oxide; Titanium Dioxide; Degradation performance
目录
1 绪论 1
1.1 课题研究背景及意义 1
1.2 目前聚乳酸增强增韧的方法 1
1.2.1 通过改变微观分子结构进行增韧改性 1
1.2.2 通过改变宏观物质组成进行增韧改性 3
1.2.3 通过复合进行增韧 4
1.2.4 填充与增强改性 5
1.2.5 聚乳酸的优点 5
1.2.6 国内外开发研究现状 6
1.2.7 聚乳酸产业的发展前景 8
2 实验部分 9
2.1 实验原料 9
2.2 主要仪器和设备 10
2.3 配方设计 10
2.3.1 PEG的添加对PLA复合材料力学性能的影响 10