GO/CNC/PVA复合纤维的制备及力学性能研究

The Preparation and Mechanical Properties of GO/CNC/PVAElectrospun Fibers

以氧化石墨烯(GO)和纤维素纳米晶(CNC)为填充质,以聚乙烯醇(PVA)为聚合物基质,通过静电纺丝技术,制得GO/CNC/PVA复合纤维。利用SEM、TEM对填充质及复合纤维形貌进行表征,并利用万能试验机系统研究了不同填充质的比例及含量对纤维力学性能的影响。结果表明:当GO与CNC质量比为1∶2时,复合纤维的拉伸强度可达10.8 MPa,杨氏模量可达401.0 MPa;当GO与CNC质量比为2∶1时,复合纤维韧性增长最明显,其值可达1.46 MJ·m^(-3);当填充质含量为1 wt%时,拉伸强度可达11.3 MPa,杨氏模量可达313.0 MPa,同时断裂伸长率、韧性也有明显的增加,增幅分别为53%和130%。

GO/CNC/PVA composite fibers were prepared by electrospinning with graphene oxide(GO)and cellulose nanocrystals(CNC)as fillers and polyvinyl alcohol(PVA)as polymer matrix.SEM and TEM were used to characterize the morphology of fillers and composite fibers.The effects of different filler ratios and contents on the mechanical properties of the fiber were systematically studied by universal testing machine.The results showed that when the mass ratio of GO to CNC was 1:2,the tensile strength of the composite fiber could reach 10.8 MPa,and Young′s modulus could reach 401.0 MPa.The toughness of the composite fiber increased most obviously when the mass ratio of GO to CNC was 2:1,which was 1.46 MJ·m^(-3).When the content of filler is 1 wt%,the tensile strength and Young's modulus can reach 11.3 MPa and 313.0 MPa,respectively.The elongation at break and toughness can also be increased by 53%and 130%respectively.