Study On Blending And Compoundings Modification Of POM

Polyoxymethylene (POM) is the high crystallinity linear thermoplastic polymer, in awide temperature range has maintained its mechanical properties, electrical properties andchemical properties, is a kind of excellent properties of engineering plastics. But there is atoughness POM poor, low notched impact strength, notch sensitivity of the defect, greatlylimiting its application in various fields in the expansion of the Therefore, both at home andabroad on how to improve the toughness POM done a great deal of research. As the structureof polymer materials, the strength and toughness are two important mechanical properties.Although toughening elastomer polymer toughness can be ideal, but the material loss ofstrength and rigidity, and reduce the processing flow, resulting in a rigid polymer particlestoughening thinking.In this paper, respectively glass fiber (GF) and nano calcium carbonate (nano-CaCO3)POM enhancements and filling modification, but also in nano-CaCO3filled on the basis of theintroduction of polyamide (COPA) on the POM composite modification, and system structure,particle spacing, crystal size and the relationship between the performance of the system, themain results are as follows:1. GF filled with POM, and the types of coupling agent on the amount of coupling agent,GF content on the POM/GF mechanical properties of composite materials, melting point andthermal stability. GF found the addition of improved POM/GF composite materials meltingpoint and thermal stability. Through coupling with the GF can be better distributed, andreinforced composite materials interface combination.2. By compounding CaCO3with POM,the influence of CaCO3content,diameter on themechanical properties,dispersion and crystallization of POM/CaCO3composties wasinvestigated.The major factor of toughening is rather the CaCO3dispersion in matrix and theinterfacial adhesion than the decrease of POM crystaldiameter.A better toughening effect isobserved when the dispersion of particles ishomogenous,the dispersion size is small and thestrong adhesiong between filler andmatrix. 3. POM/CaCO3introduced on the basis of COPA, and the inspection system. COPAfound the addition of POM to the crystallization temperature increase, accelerating thecrystallization rate, the crystallization time shortened, played a different role complementationnuclear, but also different levels of improving the thermal stability of POM.