Effect of tert-butylated aryl phosphate and carbon microspheres on performance of PC/ABS
To study the effects of tert-butylated aryl phosphate(TBP)and carbon microspheres(CMS)on the performance of polycarbonate/acrylonitrile-butadiene-styrene plastics(PC/ABS).PC/ABS/TBP/CMS composites were prepared by melting extru-sion.The flame retardants,thermal properties and physical properties of the composites were analyzed by means of horizontal and vertical combustion tester,cone calorimeter,thermogravimetric analyzer and universal material tester.The results show that TBP can improve the flame retardancy of PC/ABS,but reduce the mechanical properties and dimensional stability.When the 12% mass frac-tion of TBP is added to PC/ABS,the limiting oxygen index(LOI)of PC/ABS/TBP composite is 28.1%,and the flame retardant reaches V-0 level(3.0 mm),the tensile strength,bending strength,bending modulus and notch impact strength decrease by 19.5%,16.6%,17.5% and 56.1%,respectively,while horizontal post-mold shrinkage(PMSH),vertical post-mold shrinkage(PMSV)and melt flow rate(MFR)increase by 68.9%,58.1% and 196.1%.With the increase of CMS addition,the flame retardant properties of PC/ABS/TBP/CMS composites first improve and then deteriorate,the tensile strength,flexural strength and impact strength first increase and then decrease,and the thermal properties,rigidity and dimensional stability gradually increase.The LOI of PC/ABS/TBP/5CMS is 33.2%,and the flame retardant reaches V-0 level(2.0 mm).Compared with PC/ABS/TBP,the maximum weight loss temperature(Tmax),tensile strength,flexural strength,flexural modulus and notch impact strength increase by 7.5℃,11.7%,12.2%,14.1% and 26.3%,respectively.While PMSP,PMSH and MFR decrease by 32.0%,26.5% and 19.1%,respectively.
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