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A low power 50Hz argon plasma for surface modification of polytetrafluoroethylene

Plasma Science and Technology 2022年第11期24卷 1-13页

作者：刘恩婷赵伟祥李鸿俊胡浩俊陈爱虹杜德扬 Department of Physics Faculty of ScienceUniversity of MalayaKuala Lumpur 50603Malaysia Faculty of Engineering Multimedia UniversityPersiaran CyberjayaCyberjaya 63100Malaysia

The characteristics of a low power 50 Hz argon plasma for surface treatment of polytetrafluoroethylene(PTFE)film is presented in this article.The current–voltage behavior of the discharge and time-varying intensity of the discharge showed that a DC glow discharge was generated in reversed polarity at every half-cycle.At discharge power between 0.5 and 1 W,the measured electron temperature and density were 2–3 eV and∼10^(8) cm^(−3),respectively.The optical emission spectrum of the argon plasma showed presence of some‘impurity species’such as OH,N_(2) and H,which presumably originated from the residual air in the discharge chamber.On exposure of PTFE films to the argon glow plasma at pressure 120 Pa and discharge power 0.5 to 1 W,the water contact angle reduced by 4%to 20%from the original 114°at pristine condition,which confirms improvement of its surface wettability.The increase in wettability was attributed to incorporation of oxygen-containing functional groups on the treated surface and concomitant reduction in fluorine as revealed by the XPS analysis and increase in surface roughness analyzed from the atomic force micrographs.Ageing upon storage in ambient air showed retention of the induced increase in surface wettability.

关键词： 50 Hz glow discharge plasma surface treatment PTFE hydrophobic recovery ageing effect

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Robust, healable and hydrophobically recoverable polydimethylsiloxane based supramolecular material with dual-activate hard segment

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Science China(Technological Sciences) 2021年第2期64卷 423-432页

作者： LV Chi QI YuHao HU RuoFei ZHENG JunPing Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjin 300350China College of Chemistry and Chemical Engineering Dezhou UniversityDezhou 253023China

In this paper, a novel dual-activate hard segment strategy is proposed for the fabrication of polydimethylsiloxane(PDMS) based supramolecular polymer(PDMS-PDITC-IPDI). The unique design endows the PDMS-PDITC-IPDI with high toughness(43.1–24.5 MJ/m^(3)), tensile strength(11.3–6.6 MPa) and elongation at break(730%–615%), and the mechanical properties and dynamic property can be regulated by varying degrees of hard segment activation. Moreover, the PDMS-PDITC-IPDI polymers exhibit excellent self-recovery property during successive loading-unloading processes. Additionally, both wettability damage caused by O2 plasma treatment and mechanical damage can be healed by simple heating, showing good hydrophobic recovery and selfhealability. Taking advantages of merits of the PDMS-PDITC-IPDI, the applications of the material as recyclable adhesive and 3D printing material are also investigated.

关键词： high strength hydrophobic recovery self-healing PDMS 3D printing

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