Effect of Aluminate Coupling Agent Modified Nano-MICA Powder on PLA/PBAT System
Nanocomposite films were prepared by melting and blending nano-MICA powder modified with polylactic acid(PLA),polybutylene adipate-co-terephthalate(PBAT)and aluminate coupling agent.The properties of nanocomposite films were characterized by a Fourier transform infrared spectroscopy(FTIR),a water vapor transmittance tester,an oxygen transmittance tester,and TG-DSC synchronous thermal analysis instrument.The safety of nanocomposites was evaluated by total migration experiments and gas chromatography-mass spectrometry(GC-MS)to determine the specific migration of nanocomposites.The results show that the aluminate coupling agent successfully activates the nano-MICA powder.The glass transition temperature of PLA can be increased by modified nano-MICA powder,while the crystallinity of PLA first increases and then decreases,and the addition of 0.2%modified nano-MICA powder has the best effect.The thermal stability of the PLA/PBAT system decreases slightly with the increase of the amount of modified nano-MICA powder.The addition of 0.2%modified nano-MICA powder reduced the water vapor transmission coefficient of the film by 28%.The addition of nano-MICA powder enhances the interface roughness of the film,and the addition of modified nano-MICA powder can still meet the safety requirements as a food contact material.
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