冷等离子体改性聚乳酸纤维/热塑性淀粉复合材料的研究

Research on cold plasma modified PLA fiber/TPS composites

为提高聚乳酸纤维(PLAF)与热塑性淀粉(TPS)的界面相容性并以此改善复合材料的力学性能,通过冷等离子体对PLAF进行改性处理。采用转矩流变仪制备TPS,利用模压成型制备了PLAF/TPS复合材料。探究了不同功率冷等离子体、不同纤维长度、不同纤维含量对复合材料力学性能的影响。结果表明:冷等离子体改性处理功率越高,PLAF制备的复合材料拉伸强度、弯曲强度越高,但对复合材料的冲击强度几乎无影响;纤维含量及长度的变化对拉伸性能、弯曲强度、冲击强度变化趋势的影响不同,当纤维长度为10 mm,纤维含量为20%时,纤维的综合力学性能较为良好,此时拉伸强度为16.15 MPa,弯曲强度为56.12 MPa,冲击强度为5.54 kJ/m^(2)。

To improve the mechanical properties of composites by improving the interfacial compatibility between polylactic acid fibers(PLAF)and thermoplastic starch(TPS),the PLAF was modified by cold plasma.And the TPS was prepared by torque rheometer,and PLAF/TPS composite was prepared by compression molding.The effects of different power cold plasma,different fiber lengths,and different fiber contents on the mechanical properties of composites were explored.The results showed that the higher the power of the cold plasma modification treatment,the higher the tensile strength and flexural strength of the composites prepared by the modified PLA fibers,but had little effect on the impact properties of the composites.When the fiber length was 10 mm,the fiber content was at 20%,the comprehensive mechanical properties of the fiber are relatively good:the tensile strength was 16.15 MPa,the bending strength was 56.12 MPa,and the impact strength was 5.54 kJ/m^(2).