Studies on the properties of Montmorillonite-reinforced thermoplastic starch composites
Studies on the properties of Montmorillonite-reinforced thermoplastic starch composites
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DOI：
10.1016/j.polymer.2004.07.068
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发表时间：
2004-09-16
期刊：
影响因子：
4.6
通讯作者：
Ma, XF
中科院分区：
文献类型：
--
作者：
Huang, MF;Yu, JG;Ma, XF
以蒙脱土（MMT）为增强剂，甘油增塑热塑性淀粉（GTPS）为增塑剂，采用熔融挤出法制备了蒙脱土增强热塑性淀粉复合材料（MTPSC）。扫描电子显微镜（SEM）显示蒙脱土在GTPS中分散均匀。傅立叶变换红外光谱（FT-IR）分析表明，在MTPSC中，淀粉分子的C-O基团向高波数方向移动，而蒙脱土的活性羟基向低波数方向移动。这是由于蒙脱土与淀粉分子之间存在较强的吸附作用，同时蒙脱土的活性羟基与淀粉分子的羟基之间形成了氢键。蒙脱土处于亚微米填充过渡态，起到了阻碍剂的作用。当MTPSC在相对湿度为39%的条件下储存14 d时，其拉伸强度、杨氏模量和断裂能分别为27.34、206.74MPa和1.723Nm。结果表明，MTPSC的力学性能得到了明显的改善。同时研究了含水量对复合材料力学性能的影响。X射线衍射分析表明，蒙脱土对GTPS的结晶有较好的抑制作用。差热分析（DTA）和吸水率测试表明，MTPSC的热稳定性和耐水性优于GTPS。(C)2004 Elsevier Ltd.保留所有权利。
Montmorillonite (MMT), a kind of reinforced additive and glycerol-plasticized thermoplastic starch (GTPS) were used in the preparation of Montmorillonite-reinforced themorplastic starch composites(MTPSC) with the method of melt extrusion. Scanning electron microscope (SEM) revealed that MMT were uniformly dispersed in GTPS. Fourier Transform infrared (FT-IR) patterns showed that in the MTPSC the C-O groups of starch molecules shifted to the higher wavenumber, while the reactive hydroxyl groups of MMT shifted to the lower wavenumber. That was caused by the cooperation of the strong absorption that existed between MMT and starch molecules and hydrogen bonds that formed between the reactive hydroxyl groups of MMT and the hydroxyl groups of starch molecules. MMT was on the submicron filling transition state and acted as an obstructor. When MTPSC was stored for 14 days at RH (relative humidity) = 39%, the tensile strength, Young's modulus and breaking energy of MTPSC were 27.34, 206.74 MPa and 1.723 N m, respectively. It was obvious that the mechanical properties of MTPSC were greatly improved. At the same time, the effect of water content on the mechanical properties was studied. X-ray diffraction revealed that MMT restrained the crystallization of GTPS effectively. Differential thermal analysis (DTA) and water absorption testing showed that the thermal stability and water-resistant properties of MTPSC were better than those of GTPS. (C) 2004 Elsevier Ltd. All rights reserved.