不同成型工艺棕叶纤维/PHBV复合材料的力学性能

研究了精细化棕叶散纤维/PHBV热压复合、棕叶纤维针刺非织造布/PHBV热压复合、棕叶纤维粉末/PHBV共混复合材料的力学性能。以拉伸强度、冲击强度、弹性模量、断裂伸长率为指标探讨了PHBV质量分数、热压压强的影响,并通过SEM观测了复合材料的拉伸断面形貌。结果表明:当PHBV质量分数相同时,棕叶纤维针刺非织造布/PHBV热压复合材料的力学性能最佳,且PHBV质量分数的最优值为35%;当热压压强为13.5 MPa时,热压复合材料可获得最佳的拉伸与冲击性能;棕叶纤维针刺非织造布/PHBV热压复合材料的拉伸断面光滑,少有纤维从基质中拉出;棕叶纤维粉末/PHBV共混复合材料的拉伸断面中存在一定的团聚现象,导致PHBV的包裹性变差,结合力降低。

Mechanical properties of palm leaf fiber/PHBV composite materials with different molding processes

The mechanical properties of refined palm leaf loose fiber/PHBV hot pressing composite,palm leaf needle-punched nonwovens/PHBV hot pressing composite and palm leaf fiber powder/PHBV blend com⁃posite materials were studied.The influence of PHBV mass fraction and hot pressing pressure were dis⁃cussed using tensile strength,impact strength,elastic modulus,elongation at break as index.The tensile sec⁃tion morphology of the composites was observed by SEM.The results showed that under the same PHBV mass fraction,palm leaf needle-punched nonwovens/PHBV hot pressing composite had the best mechanics performance,and the optimum value of PHBV mass fraction was 35%.When hot pressing pressure was 13.5 MPa,composite materials by hot pressing could obtain the best tensile and impact properties.The tensile sec⁃tion of the palm leaf needle-punched nonwovens/PHBV hot pressing composite was smooth and few fibers were pulled out of the matrix.There was some agglomeration in the tensile section of palm leaf fiber powder/PHBV blend composite,which led to poor encapsulation and low adhesion of PHBV.