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Relationships between surface wettability and glass temperatures of high polymers
Author(s) -
Lee LiengHuang
Publication year - 1968
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.1968.070120410
Subject(s) - wetting , polymer , materials science , surface tension , rheology , hydrogen bond , adhesion , thermodynamics , cohesion (chemistry) , polymer chemistry , composite material , chemical engineering , molecule , chemistry , organic chemistry , physics , engineering
The adhesion between a polymer and a solid substrate may be considered to be one type of complex liquid‐solid interaction. Relationships between surface wettability and bulk properties of liquidlike polymers are discussed. A new and direct empirical relationship between the glass temperature ( T g ) and critical surface tension of a polymer (γ c ) is established:\documentclass{article}\pagestyle{empty}\begin{document}$ \gamma _c^{0.86} = \left( {0.03RT_g ‐ 1.5} \right)\left( {{{n\Phi ^2 } \mathord{\left/ {\vphantom {{n\Phi ^2 } {V_m^{0.71} }}} \right. \kern‐\nulldelimiterspace} {V_m^{0.71} }}} \right) $\end{document} where n = degree of freedom, defined by Hayes, V m = molar volume, and Φ = interaction parameter, or the ratio between reversible work of adhesion and geometrical mean of the work of cohesion. The effect of polarity and hydrogen bonding on this relationship is also discussed. The calculated γ c 's are much closer to the observed values than those calculated on the basis of parachor. With this new wettability relationship the wettability of polymers, especially of those forming no hydrogen bonds, can be related to thermal, rheological, mechanical, and relaxational properties.