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Surface characterization of poly(ethylene terephthalate) film by inverse gas chromatography
Author(s) -
Anhang John,
Gray Derek G.
Publication year - 1982
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1982.070270108
Subject(s) - inverse gas chromatography , adsorption , surface energy , decane , alkane , contact angle , polyester , materials science , ethylene , polar , polymer , gas chromatography , chromatography , characterization (materials science) , analytical chemistry (journal) , polymer chemistry , chemical engineering , chemistry , organic chemistry , hydrocarbon , composite material , nanotechnology , physics , astronomy , engineering , catalysis
The gas‐chromatographic retention of a series of n ‐alkanes at effectively zero coverage was measured on a poly(ethylene terephthalate) film surface, and the free energy of adsorption per—CH 2 —segment of n ‐alkane at zero surface coverage, ΔḠ 0 A (CH 2 ) , was calculated. This quantity is a direct measure of the London (nonpolar) interactions of the surface. A value of 40 mN/m for γ 1/2 , the London Component of the polyester surface free energy, may be estimated from the gas‐chromatographic results, in good agreement with results from contact angle measurements. The complete adsorption isotherm and spreading pressure for n ‐decane were also measured by finite‐concentration gas chromatography. The method is restricted to polar or crystalline polymers, where the n ‐alkane does not penetrate the bulk of the material during the measurements.