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Du W, Shao H, He Z, Tang C, Liu Y, Shen T, Zhu Y, Lau WM, Hui D. Cross-Linking Poly(lactic acid) Film Surface by Neutral Hyperthermal Hydrogen Molecule Bombardment. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2015; 63:10604-10610. [PMID: 26594874 DOI: 10.1021/acs.jafc.5b04249] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
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-H bonds by molecule collision from the PLA film without breaking other bonds (e.g., C-C 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-H bonds by HHIC treatment, the original physical properties (e.g., mechanical strength and light transmittance) of the PLA films are well-preserved.
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Affiliation(s)
- Wangli Du
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology , Kunming, Yunnan 650093, People's Republic of China
| | - Hong Shao
- Chengdu Green Energy and Green Manufacturing Technology R&D Center, Chengdu Development Center of Science and Technology, China Academy of Engineering Physics , Chengdu, Sichuan 610207, People's Republic of China
| | - Zhoukun He
- Chengdu Green Energy and Green Manufacturing Technology R&D Center, Chengdu Development Center of Science and Technology, China Academy of Engineering Physics , Chengdu, Sichuan 610207, People's Republic of China
| | - Changyu Tang
- Chengdu Green Energy and Green Manufacturing Technology R&D Center, Chengdu Development Center of Science and Technology, China Academy of Engineering Physics , Chengdu, Sichuan 610207, People's Republic of China
| | - Yu Liu
- Chengdu Green Energy and Green Manufacturing Technology R&D Center, Chengdu Development Center of Science and Technology, China Academy of Engineering Physics , Chengdu, Sichuan 610207, People's Republic of China
| | - Tao Shen
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology , Kunming, Yunnan 650093, People's Republic of China
| | - Yan Zhu
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology , Kunming, Yunnan 650093, People's Republic of China
| | - Woon-ming Lau
- Chengdu Green Energy and Green Manufacturing Technology R&D Center, Chengdu Development Center of Science and Technology, China Academy of Engineering Physics , Chengdu, Sichuan 610207, People's Republic of China
| | - David Hui
- Department of Mechanical Engineering, University of New Orleans , New Orleans, Louisiana 70148, United States
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Bao C, Xu KQ, Tang CY, Lau WM, Yin CB, Zhu Y, Mei J, Lee J, Hui D, Nie HY, Liu Y. Cross-Linking the Surface of Cured Polydimethylsiloxane via Hyperthemal Hydrogen Projectile Bombardment. ACS APPLIED MATERIALS & INTERFACES 2015; 7:8515-8524. [PMID: 25849306 DOI: 10.1021/acsami.5b00190] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Cross-linking of polydimethylsiloxane (PDMS) is increasingly important with recent focus on its top surface stiffness. In this paper, we demonstrate that hyperthermal hydrogen projectile bombardment, a surface sensitive cross-linking technology, is superior in enhancing the mechanical properties of a cured PDMS surface without significantly degrading its hydrophobicity. Both water contact angle measurements and time-of-flight secondary ion mass spectrometry are used to investigate the variations in surface chemistry and structure upon cross-linking. Using nanoindentation and atomic force microscopy, we confirm that the thickness of the cross-linked PDMS is controllable by the bombardment time, which opens opportunities for tuning cross-linking degree in compliance with arising requirements from the practice.
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Affiliation(s)
| | | | | | | | - Cong-Bin Yin
- ‡CCDC Downhole Service Company, CNPC, Chengdu, Sichuan 610051, China
| | - Yan Zhu
- §Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
| | | | | | - David Hui
- ∥Department of Mechanical Engineering, University of New Orleans, New Orleans, Louisiana 70148, United States
| | - Heng-Yong Nie
- ⊥Surface Science Western, The University of Western Ontario, 999 Collip Circle, London, Ontario N6G 0J3, Canada
- #Department of Physics and Astronomy, The University of Western Ontario, London, Ontario N6A 3K7, Canada
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Shao H, Hu X, Xu K, Tang C, Zhou Y, Shuai M, Mei J, Zhu Y, Lau WM. Enhanced water vapor barrier property of poly(chloro-p-xylylene) film by formation of dense surface cross-linking layer via hyperthermal hydrogen treatment. RSC Adv 2015. [DOI: 10.1039/c5ra07557b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
C–H bonds on PPXC film were preferentially cleaved by hydrogen bombardment and then formed a cross-linking moisture barrier layer.
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Affiliation(s)
- Hong Shao
- State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials
- Southwest University of Science and Technology
- Mianyang
- China
- Science and Technology on Surface Physics and Chemistry Laboratory
| | - Xin Hu
- Chengdu Green Energy and Green Manufacturing Technology R&D Center
- Chengdu Development Center of Science and Technology
- China Academy of Engineering Physics
- Chengdu
- China
| | - Keqin Xu
- Chengdu Green Energy and Green Manufacturing Technology R&D Center
- Chengdu Development Center of Science and Technology
- China Academy of Engineering Physics
- Chengdu
- China
| | - Changyu Tang
- Chengdu Green Energy and Green Manufacturing Technology R&D Center
- Chengdu Development Center of Science and Technology
- China Academy of Engineering Physics
- Chengdu
- China
| | - Yuanlin Zhou
- State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials
- Southwest University of Science and Technology
- Mianyang
- China
| | - Maobing Shuai
- State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials
- Southwest University of Science and Technology
- Mianyang
- China
- Science and Technology on Surface Physics and Chemistry Laboratory
| | - Jun Mei
- Chengdu Green Energy and Green Manufacturing Technology R&D Center
- Chengdu Development Center of Science and Technology
- China Academy of Engineering Physics
- Chengdu
- China
| | - Yan Zhu
- Chengdu Green Energy and Green Manufacturing Technology R&D Center
- Chengdu Development Center of Science and Technology
- China Academy of Engineering Physics
- Chengdu
- China
| | - Woon-ming Lau
- Chengdu Green Energy and Green Manufacturing Technology R&D Center
- Chengdu Development Center of Science and Technology
- China Academy of Engineering Physics
- Chengdu
- China
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Fabrication of Micrometer- and Nanometer-Scale Polymer Structures by Visible Light Induced Dielectrophoresis (DEP) Force. MICROMACHINES 2011. [DOI: 10.3390/mi2040431] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Liu Y, Yang DQ, Nie HY, Lau WM, Yang J. Study of a hydrogen-bombardment process for molecular cross-linking within thin films. J Chem Phys 2011; 134:074704. [DOI: 10.1063/1.3554430] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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