Pulsed plasma discharge polymer coatings

V. Panchalingam, X. Chen, H. H. Huo, C. R. Savage, R. B. Timmons, R. C. Eberhart

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The authors studied a pulsed radiofrequency glow discharge polymer film deposition method (pRFGD) on polyethylene terephthalate (PET), silicon (Si), and potassium chloride (KCl) surfaces, with the aim of better controlling film uniformity and homogeneity. A pulse generator was used to control a conventional 13.56 MHz RFGD circuit to provide plasma on and off times throughout a wide range of duty cycles. Starting monomers included fluorocarbon monomers (C8F16O and C3F6O) and more conventional unsaturated monomers [acrylonitrile (C3H3N) and vinyl trimethyl silane (C5H12Si)]. With each of these monomers progressive, large scale changes in the molecular structure of the plasma deposited films were noted with systematic variations in the RF duty cycle. Film characterizations were performed using electron spectroscopy for chemical analysis (ESCA) and fourier transform infrared (FTIR) analysis. In the case of fluorocarbon (FC) films, systematically decreasing plasma on time at a constant off time resulted in enhanced CF2 and CF3 content compared with that seen with the less highly fluorinated groups. There was virtually no oxygen atom incorporation in the FC films obtained from the oxygen containing monomers. Overall, a dramatic decrease in cross-linking of the FC polymer films was observed with decreasing RF duty cycles. A highly ordered Teflon-like structure was obtained for the lowest duty cycles. In the silane experiments, a systematic variation in the ratio of Si-H/Si-CH3 groups was observed, with this ratio increasing as the RF duty cycle decreased. Experiments with C3H3N revealed an increasing surface density of -CN groups with decreasing RF duty cycle. In general, film deposition rates per unit absorbed RF energy increased markedly with plasma off times, suggesting that significant chemistry and film growth occurred during plasma relaxation. FC coated PET samples were subjected to albumin binding studies. Albumin retention after dilute sodium dodecyl sulfate treatment was significantly increased for FC- PET compared with that seen with PET controls, suggesting that improved surface passivation is possible. The results demonstrate the utility of the variable duty cycle pRFGD method in controlling film chemistry during surface modifications. The authors think this technique offers many advantages, compared with competing approaches, for improving polymer film formation on medical device surfaces.

Original languageEnglish (US)
JournalASAIO Journal
Volume39
Issue number3
DOIs
StatePublished - 1993

Fingerprint

Fluorocarbons
Polyethylene Terephthalates
Polymers
Plasmas
Silicon
Coatings
Monomers
Polyethylene terephthalates
Silanes
Polymer films
Fluorocarbon Polymers
Albumins
Acrylonitrile
Oxygen
Photoelectron Spectroscopy
Potassium Chloride
Polytetrafluoroethylene
Fourier Analysis
Molecular Structure
Sodium Dodecyl Sulfate

ASJC Scopus subject areas

  • Biophysics
  • Bioengineering

Cite this

Panchalingam, V., Chen, X., Huo, H. H., Savage, C. R., Timmons, R. B., & Eberhart, R. C. (1993). Pulsed plasma discharge polymer coatings. ASAIO Journal, 39(3). https://doi.org/10.1097/00002480-199307000-00030

Pulsed plasma discharge polymer coatings. / Panchalingam, V.; Chen, X.; Huo, H. H.; Savage, C. R.; Timmons, R. B.; Eberhart, R. C.

In: ASAIO Journal, Vol. 39, No. 3, 1993.

Research output: Contribution to journalArticle

Panchalingam, V, Chen, X, Huo, HH, Savage, CR, Timmons, RB & Eberhart, RC 1993, 'Pulsed plasma discharge polymer coatings', ASAIO Journal, vol. 39, no. 3. https://doi.org/10.1097/00002480-199307000-00030
Panchalingam V, Chen X, Huo HH, Savage CR, Timmons RB, Eberhart RC. Pulsed plasma discharge polymer coatings. ASAIO Journal. 1993;39(3). https://doi.org/10.1097/00002480-199307000-00030
Panchalingam, V. ; Chen, X. ; Huo, H. H. ; Savage, C. R. ; Timmons, R. B. ; Eberhart, R. C. / Pulsed plasma discharge polymer coatings. In: ASAIO Journal. 1993 ; Vol. 39, No. 3.
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