聚乳酸纤维/聚乙烯醇纤维协同增强热塑性淀粉复合材料

Thermoplastic starch composites reinforced synergistically with PLA fiber and PVA fiber

为提高热塑性淀粉(TPS)塑料的力学和耐水性能,通过挤出工艺制备了含量为1%(质量分数,下同)的聚乳酸纤维(PLAF)及不同含量的聚乙烯醇纤维(PVAF)共同增强的热塑性淀粉复合材料。研究了含量为0.2%~1.4%的PVAF对TPS/PLAF/PVAF复合材料力学性能、断面形貌、耐水性能及转矩流变性能的影响。结果表明,同时加入PLAF和PVAF能有效提高复合材料的力学性能及表面耐水性能;当PLAF和PVAF含量为1%时,复合材料的拉伸强度从纯TPS的1.98 MPa提高到10.53 MPa,冲击强度由纯TPS的33.4 kJ/m^(2)提高到62.23 kJ/m^(2),水接触角由纯TPS的46.34°提高到65.02°,TPS/PLAF/PVAF复合材料的平衡扭达到最大值15.75 N·m。

To improve the mechanical and water resistance of thermoplastic starch(TPS)plastics,TPS based composites reinforced with poly(lactic acid)fiber(PLAF)and poly(vinyl alcohol)fiber(PVAF)were prepared through extrusion molding.The effects of PVAF content on the mechanical properties,cross-section morphology,water resistance,and torque rheological properties of TPS/PVAF/PLAF composites were investigated.The results indicated that the mechanical properties and surface water resistance of the composites were improved effectively with the synchronous addition PLAF and PVAF.When the contents of PLAF and PVAF were 1 wt%,the tensile strength of the composites increased from 1.98 MPa to 10.53 MPa,the impact strength increased from 33.4 kJ/m^(2) to 62.23 kJ/m^(2),and the balance torque of TPS/PVAF/PLAF compsite reached a maximum of 15.75 N·m.