Surface modification of poly(lactic acid) (PLA) film is performed via 172 nm excimer lamp irradiation. Effects on water vapor solubility and physical properties via vacuum ultraviolet (VUV) irradiation are studied systematically. After VUV irradiation, water vapor solubility increases approximately 11-43 in the low-pressure region and approximately 20-38 in the high-pressure region as surface hydrophilicity increased. The increase is attributed to hydrogen bonding with the carboxyl groups because of VUV radiation. The modified layer is significantly swelling after water vapor sorption. The hydrophilic layer forms a thickness of 2-3 m from the irradiated surface via VUV radiation, but no changes are observed inside the irradiated film. Therefore, PLA film solubility after irradiation is enhanced by hydrophilicity and the swelling effect of the surface. (c) 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42200.
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机译：聚乳酸（PLA）薄膜的表面改性是通过172 nm准分子灯照射进行的。系统地研究了真空紫外（VUV）辐照对水蒸气溶解度和物理性质的影响。VUV辐照后，随着表面亲水性的增加，低压区的水蒸气溶解度增加约11-43%，高压区的水蒸气溶解度增加约20-38%。这种增加归因于VUV辐射导致的与羧基的氢键。水蒸气吸附后，改性层明显膨胀。亲水层通过VUV辐射从照射表面形成2-3 m的厚度，但在照射膜内部未观察到任何变化。因此，辐照后的PLA膜溶解度通过表面的亲水性和溶胀效应而增强。（c） 2015 Wiley Periodicals， Inc. J. Appl. Polym.科学 2015， 132， 42200.
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