摘要
聚乳酸是一种生物降解高分子材料,具有良好的透明性、良好的机械性能和易于加工的优点,但是比较昂贵,为了降低成本,加入廉价的其他材料,制得复合材料是一种可选择的方式。淀粉来源广泛,而且价格低廉,是一种天然的可降解高分子,因此将聚乳酸和淀粉进行共混制的复合材料能够有效的降低成本。但是聚乳酸/淀粉复合材料的韧性比较差,这限制了它的应用。在聚乳酸和淀粉80∶20(质量比)的情况下,我们向复合材料中加入甘油,改善复合材料的韧性。分别加入0%、8%、16%、24%和32%的甘油,我们采用熔融共混的方法制备了聚乳酸/淀粉复合材料。通过力学性能测试和SEM等分析,研究了在不同甘油含量的情况下,复合材料力学性能。通过研究发现,随着甘油含量的增加,复合材料力学性能先上升后下降,当甘油加入量为8%(淀粉质量)时,性能最好。SEM分析表明,甘油的加入能够改善聚乳酸/淀粉复合材料的相容性。
Poly（ lactic acid） （PLA） is a biodegradable polymer,it possesses good clarity, good mechanical prop-erties and good processability. However, it is expensive. Starch is a easily available biodegradable polymer. Blending of starch with PEA forms a composite that can save the cost effectively. However, the composite is brittle. The brittleness can limit the application of the composite. To solve the brittle problem, glycerin was added to the composite. Glycerin was added into the PEA - starch composite with different content of 0% ,8% ,16% ,24% ,32% while the weight ratio of PLA and starch was fixed at 80：20. The PLA-starch composite containing glycerin was produced using a rheometer. The effect of glycerin on the mechanical properties of the composite were analysed with mechanical test equipments and SEM. The mechanical properties of the composite increased as the amount of glycerin increased.However, the mechanical properties reached a plato when glycerin amount was 8%. The SEM analysis showed that glycerin improved the compatibility of PLA and starch.
出处
《化工时刊》
CAS
2009年第1期1-4,共4页
Chemical Industry Times
基金
黑龙江省教育厅海外学人资助项目
项目编号(1153h26)
关键词
聚乳酸
淀粉
复合材料
甘油
可降解材料
机械性能
poly（ lactic acid）
starch
composite
glycerin biodegradabe material
mechanical properties
