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Cross-Linking the Surface of Cured Polydimethylsiloxane via Hyperthemal Hydrogen Projectile Bombardment.

Bao, Chao; Xu, Ke-Qin; Tang, Chang-Yu; Lau, Woon-ming; Yin, Cong-Bin; Zhu, Yan; Mei, Jun; Lee, Jonathan; Hui, David; Nie, Heng-Yong; Liu, Yu.
ACS Appl Mater Interfaces; 7(16): 8515-24, 2015 Apr 29.
Artigo em Inglês | MEDLINE | ID: mdl-25849306
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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