辅增塑剂种类对淀粉/聚羟基脂肪酸酯复合膜性能的影响

The effect of coplasticizer on the properties of starchpolyhydroxyalkanoate films

以甘油(GLY)为主增塑剂,对辅增塑剂乙二醇(EG)、聚乙二醇200(PEG200)、聚乙二醇400(PEG400)、乙酰柠檬酸三正丁酯(ATBC)改善淀粉/聚羟基脂肪酸酯(PHA)复合膜的性能进行研究。结果表明:增塑体系EG/GLY所成膜具有较高的抗拉强度,增塑体系PEG200/GLY所成膜具有较高的断裂伸长率;增塑体系ATBC/GLY所成膜具有较好的阻水性;增塑体系PEG200/GLY和PEG400/GLY所成膜对O2和CO2的阻隔性较好,膜表面比较光亮,且前者具有较高的透光率;X-射线衍射(XRD)表明,辅增塑剂PEG200和PEG400的加入增大了膜的结晶度;扫描电镜(SEM)表明,增塑体系PEG200/GLY所成膜具有最均匀与平滑的微观结构;红外光谱(FTIR)表明,复合增塑体系的增塑效果优于GLY单一增塑。综合膜的各项性能得出,辅增塑剂PEG200和PEG400对淀粉、PHA有较好的增塑效果,且PEG200的增塑效果优于PEG400。

The properties of starch-polyhydroxyalkanoate（ PHA） films were studied. The main plasticizer was glycerol（ GLY） and auxiliary plasticizer were ethylene glycol（ EG）,polyethylene glycol 200（ PEG200）,polyethylene glycol 400（ PEG400）,acetyl tributyl citrate（ ATBC）,respectively. The results showed that the composite films with EG / GLY had a higher tensile strength and the composite films with PEG200 / GLY had a higher elongation at break. The composite films with ATBC / GLY had a better moisture barrier property. The composite films with PEG200 / GLY and PEG400 / GLY had better oxygen and carbon dioxide barrier property and a lighter surface,and PEG200 / GLY also had better light transmittance. The addition of PEG200 and PEG400 increased the crystallinity of the films detected by X-ray diffraction（ XRD） analysis. Scanning electron microscope（ SEM） showed PEG200 / GLY had the most uniform and smooth microstructure. Composite plasticizing systems had better plasticizing effects than that of GLY based on Fourier Transform Infrared Spectroscopy（ FTIR）. These results suggested that PEG200 and PEG400 had better plasticizing effects on starch and PHA. PEG200 was better than PEG400.