论文部分内容阅读
以三元乙丙橡胶(EPDM)为基体,高岭土(Kaolin)、滑石粉(Talc)为功能填料,Al(OH)3为阻燃剂,短切聚酰亚胺(PI)纤维(PI Fiber)为增强材料,制备了不同PI纤维含量的可瓷化PI Fiber-Kaolin-Talc-Al(OH)3/EPDM(PKTA/EPDM)复合材料。研究了短切PI纤维对复合材料拉伸性能、热稳定性、微观形貌的影响,分析了短切PI纤维增强复合材料的陶瓷化机制。研究表明,短切PI纤维含量增加会导致可瓷化PKTA/EPDM复合材料拉伸性能下降,当纤维含量与EPDM质量比少于10:100时,复合材料力学性能良好。可瓷化PKTA/EPDM复合材料在800℃~1100℃热解后均发生陶瓷化反应。当PI纤维与EPDM质量比为少于4:100~8:100时可以有效保持复合材料高温热解后的形状尺寸稳定,并且热解产物弯曲强度在6MPa~18MPa之间。热分析结果表明,加入PI纤维可以提高可瓷化PKTA/EPDM复合材料的热稳定性。结合热分析和断面SEM分析表明,PI纤维热解、炭化后贯穿在EPDM裂解后的炭层中形成纤维增强炭层结构。这种纤维增强结构在复合材料热解过程中有助于获得尺寸稳定、形状完整的陶瓷产物。
Based on EPDM, kaolin, talc as functional filler, Al (OH) 3 as flame retardant, chopped PI fiber, To reinforce the material, PI fiber-Kaolin-Talc-Al (OH) 3 / EPDM (PKTA / EPDM) composites with different PI fiber contents were prepared. The effects of chopped PI fibers on the tensile properties, thermal stability and microstructure of the composites were investigated. The ceramic mechanism of chopped PI fiber reinforced composites was analyzed. The results show that the increase of chopped PI fiber content leads to the decrease of tensile properties of the compostable PKTA / EPDM composites. The mechanical properties of the composites are good when the fiber content is less than 10: 100. Ceramification of PKTA / EPDM composites occurred after 800 ℃ ~ 1100 ℃ pyrolysis. When the mass ratio of PI fiber to EPDM is less than 4: 100-8: 100, the shape and size of the composite can be effectively maintained after being pyrolized at high temperature, and the bending strength of the pyrolysis product is between 6 MPa and 18 MPa. Thermal analysis results show that adding PI fiber can improve the thermal stability of the porcelain PKTA / EPDM composites. Combined with thermal analysis and cross-section SEM analysis, the PI fiber was pyrolyzed and carbonized to form a fiber-reinforced carbon layer through the carbon layer after the EPDM cracking. This fiber-reinforced structure helps to achieve a dimensionally stable, fully-shaped ceramic product during the pyrolysis of the composite.