Open AccessInfluence of the Nitrogen exposure time to the plasma treatment on the wettability of polystyrene surfaces
Author(s) -
Masruroh Masruroh,
Gigih Satriyo Wibowo,
Dionysius Joseph Djoko Herry Santjojo
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1528/1/012007
Subject(s) - wetting , contact angle , polystyrene , fourier transform infrared spectroscopy , materials science , torr , surface modification , analytical chemistry (journal) , plasma , chemistry , composite material , chemical engineering , chromatography , polymer , physics , engineering , thermodynamics , quantum mechanics
The wettability of material can change from hydrophobic to hydrophilic when treated using plasma nitrogen. The present work investigated the influence of the plasma treatment duration on the modification of polystyrene’s surface coating on a glass surface. The polystyrene layer was produced by means of spin coating method with the rotational speed of 3000 RPM for 1 minute. The plasma was established by a 2 MHz RF generator at the power of 40 watts, pressure of 0.3 Torr, flow rate 40 mL/min. The samples were treated at various exposure time which were 2 min, 5 min, 10 min, and 15 min. The wettability of the polystyrene was measured using a contact angle measurement before and after the nitrogen plasma treatment. Polar functional groups related to the wettability were observed by a Fourier Transform Infrared (FTIR). The longer the treatment duration, the smaller the contact angle was observed. A very low contact angle of 6.42° was achieved at a power of 40 watt at 0.3 torr for the exposure time of 15 min. This means that the surface of the polystyrene changed to super hydrophilic or super wetting. The FTIR results show the spectra of NH 2 and C-H functional group at the wavenumber of 3485 cm 1 and 2962 cm 1 , respectively. These functional groups indicate the existence of the polar groups, which contribute to the change of surface hydrophobicity into hydrophilicity.