Structure And Characterization Of Oil Filled Monomer Casting Nylon

From the practical engineering application needs,in order to solve the poor thermodynamic and tribological properties of MC nylon,modified with lubricant as a filler,use the anionic polymerization process oil filled MC nylon,this article studied on the effects of filling lubricant on mechanical properties,tribological properties and thermal properties of MC nylon.The mechanism of modification was discussed by scanning electron microscope(SEM),differential scanning calorimeter(DSC),analyzed the impact of different lubricant content and different ratio of catalyzer and activator on the material properties.The main conclusions can be summarized as following:(1)Lubricant filling reduces the water absorption by 13%,the melting temperature rise 8~11?,the crystallization temperature rises 5~12?,the crystallinity has improved greatly,thermal stability is improved.But when the lubricant content of 8%,the crystallinity significantly decreased and melting required lower heat,poor thermal stability.(2)After adding lubricant,MC nylon bending strength,compressive strength decreased with the increase of lubricant content,and the property decreased with the addition of lubricant more than 5%.The tensile and impact properties of MC nylon were increased with the increase of lubricant content,but the tensile and impact properties were significantly decreased or even lower than that of not modified MC nylon when the lubricant content was more than 5%.When the lubricant content is 4%~5%,the comprehensive mechanical properties are better.(3)The lubricant added in the oil filled MC nylon uniformly dispersed in the nylon matrix,in the tribological tests,the oil droplets act as a lubricant,reducing friction coefficient.When the lubricant content is more than 5%,the friction coefficient of oil filled MC nylon reduced to 0.15.When the lubricant content is more than 4%,the wear extent is significantly reduced,only 80% of not modified MC nylon.(4)The catalyst mainly controls the polymerization rate,and the activator mainly controls the degree of polymerization,that is,the molecular weight of the polymer.The low amount of catalyst slow down polymerization speed and degree of crystallinity is low,the bending strength,tensile strength and compressive strength is low.When the crystallinity is lower,the amorphous portion is more.The amorphous portion play a role in toughening by the impact,so the impact toughness is higher.(5)Changing the amount of catalyst or activator has influence on the crystallinity of MC nylon,but the influence on crystallinity didn't change the essential structure of the polymer and wear mechanism,the material coefficient of sliding friction is not significantly affected.Changing the amount of catalyst or activator has a certain influence on the wear resistance,the high crystallinity with high wear resistance.When the mole ratio of catalyst activator and caprolactam is 0.002,the wear resistance is best.(6)The performance of MC nylon with different lubricant is different,the mechanical property of MC nylon with lubricant L2 is better,the friction coefficient of MC nylon with lubricant L4 is the lowest,and the wear extent of MC nylon with lubricant L2 is minimum.