玻璃纤维/聚乳酸复合包装薄膜的制备及表征

目的添加适量的玻璃纤维(GF)改善聚乳酸(PLA)的力学性能以适应产品的包装。方法聚乳酸与玻璃纤维共混制备复合包装材料,为了增加2种物质的相容性,加入KH550改性玻璃纤维以增强材料的力学性能。测试该复合材料力学性能、透光率、红外谱图,并用扫描电子显微镜观察复合包装材料的断面形貌。结果聚乳酸中添加一定量的玻璃纤维后,复合薄膜的力学性能增强。添加质量分数为15%的玻璃纤维,薄膜的拉伸强度最大;添加质量分数为25%的玻璃纤维时,冲击强度最大;用质量分数为1%的KH550偶联剂改性玻璃纤维,明显增强了GF和PLA的相容性,拉伸强度明显提高;GF所占比例愈大,GF/PLA复合薄膜材料的透光率越低,雾度越高,对包装材料的可视性有一定的影响。结论玻璃纤维具有超强的增强效果,其在改善聚乳酸脆性方面具有显著的意义和广阔的发展前景。

Preparation and Characterization of Glass Fiber/Poly Lactic Acid Composite Packaging Film

Proper amount of glass fiber (GF) was added into poly lactic acid (PLA) to improve its mechanical property for adapting to the packing of the products. PLA and GF were mixed together to prepare composite packaging material. In order to enhance the compatibility of the two substances, KH550 was added to modify GF to increase the mechanical properties of the material. And then the mechanical properties, light transmittance, fourier transfer infrared spectroscopy(FTIR)were tested, and the fracture appearance of the composite packing materials was observed by SEM. It was showed that the mechanical properties of the composite packaging material increased after GF was added into PLA. When the mass fraction of GF was 15%, the tensile strength of the composite packing materials reached the maximum. When the mass fraction of the GF was 25%, the impact strength reached the maximum. When the mass fraction of 1% KH550 coupling agent was used to modify GF, the tensile strength increased significantly, because it increased the compatibility between GF and PLA. As the percentage of GF increased, the light transmittance of GF/PLA composite film decreased, whereas the haze increased obviously, thus it influenced the visibility of packaging materials. In conclusion, GF had strong reinforcing effect. It will have significant meaning and wide development in improving brittleness of PLA.