Abstract
In this work, the plastic of polylatic acid (PLA) film is coated by alumina (Al2O3) through dielectric barrier discharge plasma assisted atomic layer deposition (DBD PA-ALD) for the proposal of the barrier property enhancement. The influence of ALD Al2O3 thickness on properties of barrier, mechanical, optical and degradation is investigated in detail. It is obtained that the growth rate of Al2O3 in DBD PA-ALD is as quick as 0.12 nm/cycle. After coated ∼40 nm Al2O3, the water vapor transmission rate of PLA is reduced by two orders of magnitude. Additionally, it is noticed that the tension strength of the coated film is improved slightly, whereas the light transmission rate is decreased with the increase of Al2O3 thickness. The degradation test shows that Al2O3 coating almost does not affect the self-degradation rate of PLA film.
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