湿热压对芳纶纸基材料微观结构及性能的影响

Effect of wet-hot calendering on the micro-structure and properties of PPTA paper-based composite

采用湿热压工艺对芳纶纸进行热压,采用扫描电镜(SEM)、匀度仪、全自动压汞仪(MIP)、X射线衍射仪(XRD)等现代分析仪器研究了对位芳纶纸湿热压过程中微观结构和成纸性能的变化.结果显示,当芳纶湿纸水分含量为120%时,成纸性能最佳,相比干纸热压,湿热压后芳纶纸表面更加光滑平整,匀度提高,孔隙率降低了54.5%,结晶度增加了59.39%,层间结合强度(ILSS)增加了57.83%,强度性能和绝缘性能大幅度提升,湿热压具有一定的实用价值.

In this study the change of micro-structure and prperties of PPTA paper-based composite were investigated by scanning electron microscopy（SEM）,automatic mercury porosimeter（MIP）,X-ray diffraction（XRD）and other modern analytical instruments after wethot calendering respectively.The results showed that compared to dry paper the propertise of paper had a greatly improvement with the increasing of moisture content.The surface and the evenness of paper became more smooth and uniform,the internal structure of paper became more closely as the porosity decreased by 57% when the moisture content is 120%,the crystallinity and internal bond strength（ILSS）of paper increased by 59.39% and 57.83% respectively.So wet-hot calendering has a practical value to improve the mechanical strength and electrical properties of PPTA paper.