湿法PET无纺布支撑层的制备及其在聚合物固态电解质膜中应用研究

Preparation of wet-processed PET Nonwoven Fabric Support Layer and Its Application in Polymer Solid Electrolyte Membrane

采用湿法抄纸和热压工艺,制备了高孔隙率、高强度、超薄、厚度均一性的多孔PET无纺布,作为聚合电解质膜的支撑材料。实验首先优选确定了最佳主干纤维(SF)与粘接纤维(BF)质量比为6:4,通过优化疏解分散工艺,制备了分散性良好的PET短纤浆料,抄片得到厚度偏差±5 μm的原纸。详细研究了热压温度和压力对最终产品厚度、孔隙率、拉伸强度和透气性等性能的影响。结果表明无纺布的机械强度和孔隙率、透气性呈负相关,经平衡各工艺参数后,可制备拉伸强度大于40 MPa、孔隙率大于40%、厚度小于20 μm的超薄、高强度湿法PET无纺布。此外,将优化得到的高强度湿法PET无纺布与聚合物电解质复合得到聚合物电解质膜,经评价其具有优良的电化学性能。

A highly porous,high-strength,ultrathin nonwoven PET fabric with uniform thickness was prepared as a supporting material for polymer electrolyte membranes in the use of wet paper-making and hot-pressing processes.The experiments first optimized the mass ratio of support fibers(SF)to binder fibers(BF)at 6:4.By optimizing the dispersion process,a well-dispersed PET short fiber slurry was prepared.The slurry was then sheeted to produce base paper with a thickness deviation of±5μm.The study then examined in detail the effects of hot-pressing temperature and pressure on the final product's thickness,porosity,tensile strength,and air permeability.It was found that the mechanical strength of the nonwoven fabric was negatively correlated with its porosity and air permeability.After balancing the process parameters,an ultrathin,high-strength wet method PET nonwoven fabric was produced,achieving a tensile strength greater than 40 MPa,porosity over 40%,and thickness below 20μm.In addition,the optimized high-strength wet-processed PET non-woven fabric was combined with polymer electrolyte to form a polymer electrolyte membrane,which exhibits excellent electrochemical performance.