摘要随着科学的高速发展，人类对石油的依赖性越来越强。然而，石油是不可再 生资源，并且石油基材料大多都会对环境造成污染。因此，随着石油储量的逐渐 减少，而且环境的逐渐恶化，对绿色可再生材料的研究已刻不容缓。只有尽快研 究出能代替石油基塑料的新型材料才能最有效地解决这些问题。83139

本文通过调整配方体系中 PBAT/TPS、PLA 和 PBAT 的比例，并采用熔融共 混和模压成型相结合的工艺制备出AX8900 增容改性的 TPS/PLA/PBAT 淀粉基生 物降解材料。分别采用哈普电气 RM-400B 型毛细管转矩流变仪、RL-Z1B1-熔体 流动速率仪、SANS CMT 4024 万能电子拉伸试验机、动态机械分析仪、JC2000D1 测量仪、XL-30  ESEM  环境扫描电子显微镜来测量分析 TPS/PLA/PBAT 复合材

料的流变性能、熔体流动速率、力学性能、动态热机械性能、接触角、微观形貌 表征、X 射线衍射表征等。

结果表明，材料在加工的过程中，随着剪切速率增加，材料的剪切粘度均出 现下降，材料的熔体表现为“剪切变稀”的非牛顿特性，属于假塑性流体；当淀粉 含量一定时，随着 PBAT 含量的增加，共混材料的 MFR 值逐渐降低，由 10。08 降低到 6。87g/min，拉伸强度也逐渐降低，而共混材料的断裂伸长率随着 PBAT 含量的增加而逐渐升高，由 70。74%增加到 511。13%；淀粉含量一定时，PBAT 含 量的增加，共混材料的储能模量由 450MPa 减小到 147MPa，这个规律与前面的 拉伸强度是相同的；同时随着 PBAT 含量的增加，共混材料的发生的松弛现象逐 渐变弱；当淀粉含量一定时，随着 PBAT 含量的增加，共混材料中的酯化度逐渐 降低，淀粉中的羟基参与酯化反应的数量就逐渐减少，共混材料的接触角逐渐从

88。58o 降低到 80。41o，因此，共混材料的亲水性逐渐增强；当淀粉含量一定时， PBAT 含量越高，淀粉的酯化度越小，分散在 PBAT 中淀粉颗粒越多；随着 PBAT 含量的减少，PLA-MA 含量的增加，淀粉的酯化度逐渐增加，使得 PBAT/PLA/TPS 复合材料的结晶性逐渐下降。

毕业论文关键词：热塑性淀粉；聚乳酸；流变；共混

Abstract With the rapid development of science, the dependence of Human on oil is getting stronger。 However, oil is non-renewable resources, and most of the petroleum-based materials will cause pollution to the environment。  Therefore,  with the gradual reduction of oil reserves, and the gradual deterioration of the environment, the study of green renewable materials has become essential。 The most effective way to solve these problems is to develop new materials to replace the petroleum based plastic  materials   as soon as possible。

In this paper, we have used the methods of the melt blending and molding to prepared the starch based and AX8900 modified biodegradable material of TPS/PLA/PBAT blend by adjusting the contend of PBAT and PLA of the formula system。 It  respectively  uses   electrical   RM-400B   capillary   rheometer   torque, RL- Z1B1- melt flow rate instrument, SANS CMT 4024 universal electronic tensile testing machine, dynamic mechanical analyzer, JC2000D1 meter, XL-30 ESEM environment scanning electron microscope analysis to measure the TPS / PLA / PBAT rheological properties of composite materials, the melt flow rate, mechanical properties, dynamic mechanical properties, contact angle, microstructure characterization,   X-ray diffraction  to characterize   the like。

The results show that with increasing of shear rate the shear viscosity of all the material decreased in processing。 The melt of the material is shown as the non Newtonian property of "shear thinning"。 When the starch content is certain, with the increase of PBAT content, the MFR value of the composites decreased gradually, reduced from 10。08 to 6。87g/min, and the tensile strength also decreased。 But the elongation at break of the blends increased with the increase of PBAT content, increased from 70。74% to 511。13%。 When the starch content is  certain,  with  the PBAT content increasing, the storage modulus of the blend  was  reduced from 450MPa to 147MPa, this rule is the same as the tensile strength of the front。  At the same time, with the increase of PBAT content, the relaxation degree of the blending material  is  gradually  weakened。 When the  starch content  is certain,  with the PBAT