PVDF对芳纶无纺布/环氧树脂共固化复合材料力学和阻尼性能的影响  

Effects of PVDF on mechanical and damping properties of co-cured aramid nonwoven fabric/epoxy composite

作　　者：倪楠楠[1] 温月芳[1] 贺德龙[2] 益小苏[2] 张涛[3] 许亚洪[3] 

机构地区：[1]浙江大学化学工程与生物工程学院,杭州310013 [2]北京航空材料研究院,北京100095 [3]航天特种材料与工艺研究所,北京100074

出　　处：《复合材料学报》2015年第6期1791-1799,共9页Acta Materiae Compositae Sinica

基　　金：国家"973"计划(2011CB605605)

摘　　要：为评价热塑性结晶聚合物聚偏二氟乙烯(PVDF)对共固化复合材料动态力学和阻尼性能的影响,首先,将PVDF负载到芳纶无纺布(ANF)上,采用共固化工艺制备了PVDF-ANF/环氧树脂(EP)结构阻尼复合材料。然后,利用动态机械分析仪测试了PVDF-ANF/EP复合材料的损耗因子、损耗模量和储能模量的温度谱;通过弯曲强度、弯曲模量和层间剪切强度的测试评价了复合材料的静态力学性能;通过单悬臂梁振动实验测试了复合材料的共振频率及自由振动衰减曲线,并计算了损耗因子;通过I型、II型层间断裂韧性实验及断面微观形貌的观察研究了复合材料的断裂韧性及增韧机制。最后,对复合材料的微观结构进行分析,探讨了其兼具力学性能和阻尼性能的结构内因。结果表明:通过在ANF表面负载PVDF,可在不引起复合材料力学性能明显下降的前提下,进一步提高PVDF-ANF/EP复合材料的阻尼性能和层间断裂韧性,复合材料的损耗因子提高了33.3%,I型和II型断裂韧性分别提高了168%和208%。In order to estimate the effects of thermoplasticity crystalline polymer polyvinylidene fluoride（PVDF）on dynamic mechanical and damping properties of co-cured composites,PVDF was loaded on aramid nonwoven fabric（ANF）,and PVDF-ANF/epoxy（EP）structural damping composites were fabricated by co-cured process firstly.Then,the temperature spectra of loss factor,loss modulus and storage modulus were tested through dynamic mechanical analyzer;flexural strength,flexural modulus and interlaminar shear strength were measured to evaluate the static mechanical properties of the composites;the resonant frequencies and decaying curves of free vibration were tested by single cantilever beam vibration experiment and the loss factors were calculated;the fracture toughness and toughening mechanisms were investigated by type I and type II interlaminar fracture toughness experiments as well as the observation of fracture surface micro morphologies.At last,the microstructure of the composites were analyzed to discuss the structural internal reasons for having both mechanical properties and damping properties.The results indicate that the damping properties and interlaminar fracture toughness of PVDF-ANF/EP composites can be improved further more by loading PVDF on the surfaces of ANF without leading to an obvious decrease of mechanical properties of the composite.The loss factor of composite is improved by 33.3%,and the fracture toughness of type I and type II are improved by 168% and 208%,respectively.

关 键 词：无纺布 结构阻尼复合材料 PVDF 共固化 离位增韧 

分 类 号：TB332[一般工业技术—材料科学与工程]