碱处理对竹纤维增强聚乳酸基复合材料力学性能的影响

The influence of alkali treatment on the mechanical properties of bamboo fibers reinforced polylactide composites

以竹原纤维和聚乳酸(PLA)纤维为原料,采用非织造工艺、热压成型工艺制成了竹原纤维/PLA可降解复合材料。探索了竹原纤维配比及碱处理工艺对复合材料拉伸性能的影响,并采用光学显微镜观察了复合材料拉伸断口形貌。结果表明:体积比为60/40的竹原纤维/PLA复合材料的拉伸强度和模量最高,用经过碱处理的竹原纤维制复合材料可使拉伸性能提高,其拉伸强度与模量分别达到26.02 MPa和5.38 GPa,比碱处理前分别提高了27.68%和37.60%;竹原纤维/PLA复合材料拉伸断面形貌显示碱处理后的竹原纤维与PLA树脂的界面黏合性能有所改善;碱处理的最佳碱液浓度是NaOH的质量分数为4%。

Bamboo fibers reinforced polylactic biodegradable composites were prepared by means of bamboo fibers and polylactic acid fibers,nonwoven method and moulding pressing technology.The effects of volume fraction and alkali treatment of bamboo fibers on the tensile properties of the composites were discussed respectively.The tensile fracture surfaces and the adhesion were examined by optical microscopy.The results reveal that the tensile strength and modulus of the bamboo/PLA peaked with the fiber volume fraction of 60/40.After alkali treatment,the tensile property of bamboo/PLA could be improved to 26.02 MPa and the modulus be 5.38 GPa respectively improved by 27.68% and 37.60% comparing with that of untreated bamboo/PLA.The fracture surface of bamboo/PLA compound material shows that the interface adhesion between two kinds of fibers would improve after alkali treatment,and the optimum concentration of alkali treating liquid be 4% of NaOH mass fraction.