In order to improve the brittleness and poor toughness of polylactic acid(PLA),BR/PLA composites were prepared by melt blending of cis-polybutadiene rubber(BR)and polylactic acid.The mechanical properties,cross-sectional morphology and crystal morphology of BR/PLA composites were tested.The results showed that the tensile and impact properties of polylactic acid were obviously improved by introducing cis-polybutadiene rubber.When the processing temperature is 210℃,the processing time is 8 min and the rotor speed is 60 r/min,the comprehensive properties of the composite are the best.With the increase of BR content,the tensile strength of PLA/BR composites decreased gradually,while the elongation at break increased at first and then decreased,and the impact strength increased gradually.With the addition of BR,the crystal density of PLA decreases and the spherulite integrity becomes worse.
维普
万方数据