Cross-Linking Poly(lactic acid) Film Surface by Neutral Hyperthermal Hydrogen Molecule Bombardment

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• 作者：Wangli Du ; Hong Shao ; Zhoukun He ; Changyu Tang ; Yu Liu ; Tao Shen ; Yan Zhu ; Woon-ming Lau ; David Hui
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2015
• 出版时间：December 16, 2015
• 年：2015
• 卷：63
• 期：49
• 页码：10604-10610
• 全文大小：415K
• ISSN：1520-5118

文摘

Constructing a dense cross-linking layer on a polymer film surface is a good way to improve the water resistance of poly(lactic acid) (PLA). However, conventional plasma treatments have failed to achieve the aim as a result of the unavoidable surface damage arising from the charged species caused by the uncontrolled high energy coming from colliding ions and electrons. In this work, we report a modified plasma method called hyperthermal hydrogen-induced cross-linking (HHIC) technology to construct a dense cross-linking layer on PLA film surfaces. This method produces energy-controlled neutral hyperthermal hydrogen, which selectively cleaves C鈥揌 bonds by molecule collision from the PLA film without breaking other bonds (e.g., C鈥揅 bonds in the polymer backbone), and results in subsequent cross-linking of the carbon radicals generated from the organic molecules. The formation of a dense cross-linking layer can serve as a barrier layer to significantly improve both the hydrophobicity and water vapor barrier property of the PLA film. Because of the advantage of selective cleavage of C鈥揌 bonds by HHIC treatment, the original physical properties (e.g., mechanical strength and light transmittance) of the PLA films are well-preserved.