Spreading pressures of water and n-propanol on polymer surfaces


Busscher, H.J. and Kip, G.A.M. and Silfhout, A. van and Arends, J. (1986) Spreading pressures of water and n-propanol on polymer surfaces. Journal of colloid and interface science, 114 (2). pp. 307-313. ISSN 0021-9797

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Abstract:Spreading pressures of water and n-propanol on polytetrafluoroethylene (PTFE), polystyrene (PS), polymethylmethacrylate (PMMA), polycarbonate (PC), and glass are determined from ellipsometrically measured adsorption isotherms by graphical integration, yielding for water 9, 37, 26, 33, and 141 erg·cm−2 on PTFE, PS, PMMA, PC, and glass, respectively, while for n-propanol 5, 38, 26, 23, and 37 erg·cm−2, respectively. The spreading pressures for water as well as n-propanol are comparable to values previously obtained from contact angle data with water, water/n-propanol mixtures and α-bromonaphthalene using the geometric mean equation. This method yielded spreading pressures of 9, 14, 30, 27, and 70 erg·cm−2 for PTFE, PS, PMMA, PC, and glass, respectively. The numerical correspondence between the spreading pressures for water and n-propanol determined ellipsometrically with the values derived from contact angles indicates the necessity as well as the validity of taking the spreading pressures of water/n-propanol mixtures into account as a constant, if surface free energies of high energy substrata are approximated by contact angle measurements.
Item Type:Article
Copyright:© 1986 Elsevier Science
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/69714
Official URL:https://doi.org/10.1016/0021-9797(86)90416-9
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