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  Global Journal of Physical Chemistry. Volume 2, Issue 2 (2011) pp. 206-212
  Research Article Free Article
Study on the surface properties of HMDSO/O2 plasma treated polyethylene terephtalate
  Z. Ziaria, S. Sahlia, I. Nouicera, A. Bellelb  
a Laboratoire de Microsystèmes et Instrumentation (LMI), Faculté des Sciences de l’Ingénieur Constantine, Algérie
b Laboratoire d’Etude des Matériaux Electroniques pour Applications Médicales (LEMEAMED), Faculté des Sciences de l’Ingénieur, Constantine, Algérie

  Polyethylene terephtalate (PET) films surface properties coated by thin layers deposited from pure hexamethyldisiloxane (HMDSO) and diluted with O2 in low frequency powered plasma reactor have been investigated. The surface characterization of the coated PET film was carried out using Fourier transform infrared spectroscopy (FTIR), water contact angle measurements and surface potential decay (SPD). FTIR spectrum of thin layers elaborated from pure HMDSO, showed organic groups (Si-CH3, CHx and Si-C) resulting in the improvement of film PET hydrophobicity. The water contact angle increased from 64° for untreated PET to 93° after HMDSO plasma coating. The measurement of surface potential evolution after corona charge deposition recorded on coated and untreated PET showed slower charge decay for coated PET film, indicating the retention of deposited charges at the film surface. However, for films coated with a mixture of HMDSO and O2, an opposite behavior has been observed. FTIR spectra showed the apparition of hydroxyl groups (-OH) which makes the film more hydrophilic. The water contact angle decreased from 64° for untreated films to 47° for films coated with thin layer deposited using 10%HMDSO/90%O2.
  Coating; Hydrophilicity; HMDSO; Surface modification; FTIR; SPD  

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