耐磨增韧改性聚甲醛的制备及性能研究

用双螺杆共混挤出法制备了不同比例的聚四氟乙烯(PTFE)纤维改性聚甲醛(POM),考察了PTFE纤维含量对POM摩擦磨损性能、力学性能和热稳定性的影响。在POM/PTFE耐磨体系中,创新性地引入聚氧化乙烯(PEO)作为相容剂,制备出耐磨性能和韧性俱佳的POM改性材料。对POM改性材料进行了耐磨性和力学性能分析,利用偏光显微镜进一步证实了PEO能促进PTFE纤维和POM的相容性。结果表明,随着PTFE纤维含量的增加,POM的摩擦磨损性能有所提高,但力学性能不理想。在8%PTFE+92%POM体系中引入PEO,改性材料的摩擦因数低至0.169,缺口冲击强度比POM提高了173%,得到了耐磨和增韧效果显著的POM改性材料。

Preparation and Properties of Wear-resistant and Toughening Modified POM

Polytetrafluoroethylene(PTFE)fibre modified polyformaldehyde(POM)products with different proportions were prepared by twin screw blending extrusion.The influence of PTFE fiber contents on the friction and wear properties,mechanical properties and thermal stability of POM were investigated.Taking polyoxyethylene(PEO)as the compatibilizer in POM/PTFE,the POM modified material with excellent wear resistance and toughness enhancement was prepared.The tribological and mechanical properties of the POM modified material were analyzed,and the modification mechanism was further confirmed by polarizing microscope.The results show that with the increase of PTFE fiber contents,the frictional and wear properties of POM are improved,however,the mechanical properties are not good.The PEO is introduced into the POM/PTFE,the friction coefficient of the modified material is as low as 0.169,and the notch impact strength is 173%higher than that of the pure POM.POM modified material with remarkable wear-resisting and toughening effect is prepared.