耐燃油级高端共聚甲醛的结构及性能对比OACSTPCD

This article comprehensively compares the performance differences between fuel-resistant high-end POM(MC90-DR)and general-purpose grade POM(MC90).The differences in spherical crystal size as well as crystalline properties of MC90-DR were analyzed by comparing the spherical crystal photographs and DSC curves.In the TG curves,the thermal stability properties of POM were investigated.The changes in strength and modulus of POM were compared by mechanical property tests.The differences in free formaldehyde content,unstable end-group content,melt index,and ash content of POM were also comparatively analyzed.In both the acid and fuel resistance tests,MC90-DR has a much better performance.The colour space L*a*b test was used to analyze the difference in the hue of POM.Fuel-resistant grade high-end POM can significantly improve the resistance of POM parts to harsh external environments,such as fuel or acid,to meet the needs of automotive fuel systems.