Guo Bin, Zha Dongdong, Li Bengang, Yin Peng, Li Panxin
College of Science, Nanjing Forestry University, Nanjing 210037, China.
Agricultural and Forest Products Processing Academician Workstation of Henan Province, Luohe 462600, China.
Materials (Basel). 2018 Apr 21;11(4):640. doi: 10.3390/ma11040640.
We reported a new method to prepare polyvinyl alcohol (PVA)/thermoplastic starch (TPS) composites by using polyvinyl alcohol microspheres (PVAMS). The PVAMS/TPS composites were characterized using tensile test, scanning electron microscopy (SEM), dynamic mechanical thermal analysis (DMTA) and thermogravimetric analysis (TGA). The results exhibited that adding small amounts of PVAMSs can effectively improve the mechanical strength and toughness of the composites, especially for the 1 wt %PVAMS in TPS matrix, with a tensile strength of 3.5 MPa, an elongation at break at 71.73% and an impact strength of 33.4 kJ/m². Furthermore, the SEM and shift in the tan δ peak (T and T) at the maximum value of 69.87 and −36.52 °C indicates that the PVAMS decreased the mobility of the amorphous starch molecules due to the strong intermolecular hydrogen bonds between PVAMS and TPS. The peak temperature of maximum decomposition rate (Tp) of 1 wt % PVAMS/TPS composites increased about 5 °C compared with TPS in TGA curves.
我们报道了一种利用聚乙烯醇微球（PVAMS）制备聚乙烯醇（PVA）/热塑性淀粉（TPS）复合材料的新方法。采用拉伸试验、扫描电子显微镜（SEM）、动态热机械分析（DMTA）和热重分析（TGA）对PVAMS/TPS复合材料进行了表征。结果表明，添加少量的PVAMS可以有效提高复合材料的机械强度和韧性，特别是在TPS基体中添加1 wt%的PVAMS时，拉伸强度为3.5 MPa，断裂伸长率为71.73%，冲击强度为33.4 kJ/m²。此外，SEM以及损耗角正切峰值（T和T）在69.87和−36.52℃最大值处的位移表明，由于PVAMS与TPS之间存在强分子间氢键，PVAMS降低了无定形淀粉分子的流动性。在TGA曲线中，1 wt% PVAMS/TPS复合材料的最大分解速率峰值温度（Tp）比TPS提高了约5℃。
