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论文类型：期刊论文

发表时间：2018-04-01

发表刊物：APPLIED SURFACE SCIENCE

收录刊物：SCIE、EI

卷号：436

页面范围：411-418

ISSN号：0169-4332

关键字：Plasma copolymerization; RF pulsed plasma; Superhydrophobicity; Superhydrophilicity; Tunable wettability; Surface adhesion

摘要：Octafluorocyclobutane and acrylic acid (C4F8-co-AA) plasma copolymer coatings are deposited using a pulsed wave (PW) radio frequency (RF) plasma on low density polyethylene (LDPE). The influence of duty cycle in pulsed process with the monomer feed rate on the surface chemistry and wettability of C4F8-co-AA plasma polymer coatings is studied. The concentration of the carboxylic acid (hydrophilic) groups increase, and that of fluorocarbon (hydrophobic) groups decrease by lowering the duty cycle. The combined effect of surface chemistry and surface morphology of the RF pulsed plasma copolymer coatings causes tunable surface wettability and surface adhesion. The gradual emergence of hydrophilic contents leads to surface heterogeneity by lowering duty cycle causing an increased surface adhesion in hydrophobic coatings. The C4F8-co-AA plasma polymer coatings on the nanotextured surfaces are tuned from repulsive superhydrophobicity to adhesive superhydrophobicity, and further to superhydrophilicity by adjusting the duty cycles with the monomer feed rates. (C) 2017 Elsevier B.V. All rights reserved.