Abstract:

Poly（butylene terephthalate adipate） （PBAT）， poly（lactic acid） （PLA）/calcium carbonate composites with different types of lubricants were prepared by using a melt blending method， and the effect of lubricant types on the mechanical and emissive properties of the composites was investigated. The results indicated that in addition to internal lubrication to enhance molecular chain slip， the introduction of stearate also triggered the localized breakage of the PBAT/PLA molecular chain. This resulted in an increase in the melting index but a decrease in the tensile properties and toughness of the films. The introduction of erucic acid amide， oleic acid amide， or ethylene bis stearamide （EBS） led to a slight decrease in the heat seal strength， and the introduction of stearyl ester salts improved the decrement rate in the heat seal strength. There was an increase in odor with the introduction of erucic acid amide or oleic acid amide， and the odor was further increased with the introduction of calcium stearate and zinc stearate. The total volatile organic compounds （TVOC） tended to increase with the introduction of lubricants， and the introduction of zinc stearate elevated the TVOC amount of the film by 40.2 %. Toluene， styrene， formaldehyde， acetaldehyde， and acrolein in the volatile organic compounds did not change significantly with the introduction of erucic acid amide， oleic acid amide， or EBS， whereas the introduction of stearate resulted in a significant rise in these categories.

Key words: poly（butylene adipate?co?terephthalate）/poly（lactic acid）, lubricant, odor, volatile organic compound