-热塑性淀粉基纳米复合材料的制备及其性能研究学士学位论文VIP专享

毕业论文热塑性淀粉基纳米复合材料的制备及其性能讨论 摘要：淀粉是一种十分重要的天然高分子，具有来源广泛、价格低廉和可生物降解等优点，是制备生物可降解材料的理想原料。天然淀粉以淀粉粒的形式存在， 具有很高的结晶度(20-45％)。淀粉分子之间氢键作用强，限制了分子链的运动，因此淀粉不具备热塑性加工的性能。通过添加分子的增塑剂，在热和剪切的作用下可制备热塑性淀粉材料。但是，热塑性淀粉的力学性能和耐油性能较差，限制其作为材料使用。 目前，大量的讨论工作都集中在改善热塑性淀粉的力学性能上，本文使用转矩流变仪，在增塑剂的存在下制备了热塑性淀粉。淀粉的塑化是热、剪切和增塑剂共同作用的结果，不能简单的考虑其中一种因素的作用。以水和甘油为增塑剂制备的 热塑性淀粉，再与聚乳酸共混，对热塑性淀粉进行改性，并对其进行力学性能测试及其表征。 本文的讨论目的为热塑性淀粉基纳米复合材料制备及其性能讨论，为制各综合性能优异的生物降解材料提供了理论和实践基础。 关键词：热塑性淀粉，塑化，聚乳酸，共混,，复合材料 Thermoplastic starch-based nano-composites and their structure and properties Abstract: Starch is a very important natural polymer, has a wide variety of sources, low cost and biodegradable advantages, is the ideal raw material preparation of biodegradable materials. The natural starch to starch granules in the form of existence, has a high degree of crystallinity (20-45%). Hydrogen bonds between starch molecules, limiting the movement of molecular chain, so the starch does not have the performance of thermoplastic processing. Add molecules of the plasticizer, the preparation of thermoplastic starch-based material under the action of heat and shear. However, the poor mechanical properties and water resistance of thermoplastic starch limit its use as a material. Currently, a large number of studies have focused on thermoplastic starch to improve the mechanical properties andoil resistance.This article uses a torque rheometer, thermoplastic starch prepared in t...