Effects of SMA contents on properties of PMMA/ASA/SMA ternary alloy materials
In order to improve the comprehensive properties of polymethyl methacrylate(PMMA)material and expand its application in impact resistance and high temperature environment,taking styrene-maleic anhydride copolymer(SMA)/acrylonitrile-styrene-acrylate terpolymer(ASA)as modification agents,PMMA/ASA/SMA ternary alloy materials were prepared by melt blend-ing modification.The total mass fraction of SMA and ASA is fixed at 30%,and the effects of the change of SMA content on the mechanical properties,heat resistance and component compatibility of the alloy materials were studied.The results show that the addition of SMA and ASA can significantly improve the elongation at break and notched impact strength of PMMA.With the increase of SMA content,the tensile strength and bending strength of the alloy materials gradually increase,and the elongation at break first increases and then decreases,reaching the maximum when the mass fraction of SMA is 5%,which is 32.1%higher than that of the material without SMA,the notched impact strength decreases,but it is still much higher than that of pure PMMA.The thermal deformation temperature of the alloy material is positively correlated with the SMA content.When the mass fraction of SMA is increased by 1%,the thermal deformation temperature can be increased by 0.36℃,and when the mass fraction of SMA is 20%,the thermal deformation temperature increases to 103.9℃.SMA can effectively increase the glass transition temperature(Tg)of the alloy materials.Compared with the materials without SMA,the Tg of the alloy materials with 20%of SMA mass fraction is increased from 122.50℃to 133.01℃,which is an increase of 10.51℃.In addition,the loss factor of the alloy material shows a single peak,which indicates the compatibility of PMMA/ASA/SMA system is good.
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