Effects of the Content and Particle Size of Calcium Carbonate on the Mechanical and Emanation Properties of Poly(butylene terephthalate adipate)/Polylactic Acid Blends
The blends of poly(butylene terephthalate adipate)(PBAT),polylactic acid(PLA)and calcium carbonate were prepared by melt blending method,and the effects of the type and particle size of calcium carbonate on the mechanical and emanation properties of the blends were investigated.The results indicate that as the content of calcium carbonate 1T-JI(with a D50 particle size of 1 μm,where D50 is the diameter corresponding to 50%cumulative particle size distribution)increases,the tensile strength of the blends gradually decreases.Once the D50 of calcium carbonate increases to 5 μm,the elongation at break of the blends markedly decreases.When the 1T-JI mass fraction is 5%-10%,the dart strength is maintained well.After further increasing the calcium carbonate content and regulating the calcium carbonate particle size,the falling dart strength decreases significantly.When the 1T-JI mass fraction is 0-10%,with the increase of the calcium carbonate content,the odor grade and headspace total volatile organic compounds(TVOCs)increase gradually.The benzene in the organic volatile organic compounds(VOCs)of the blends remains low,while the total carbon content(C6-C16)gradually increases with the increase of calcium carbonate content and particle size,and the total carbon content of 5T-25%blend increases by 61.9%relative to that of PBAT/PLA blend.The slide glossiness gradually decreases with the increase of calcium carbonate content and particle size,with a 47.7%decrease for the 5T-25%blend relative to the PBAT/PLA blend.Further analysis of the slides shows that the slide corresponding to the 5T-25%sample has very obvious"oil stains".This study has theoretical supports for the application promotions of biodegradable materials,and has an important research value for the green transformation in the plastic flexible packaging field.
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