Surface energy polymers

Filler/polymer surface energy ratio Equilibrium work of 1.14 0.87 0.76... 

The major unknown in the cathodic delamination process is the mechanism by which the interfacial bond is broken. Alkaline attack of the polymer, surface energy considerations, and attack of the oxide at the interface have all been proposed, but none of the available evidence allows an unequivocal answer. 

Bodde, H. E., and Lehr, C. M. Bioadhesive polymers Surface energy and molecular mobility considerations. Biofouling 4 163—169, 1991. 

The decrease of polymer surface energy, in particular, with lowering of polymer polarity (when employing as substrates polystyrene, polycarbonate, and Teflon with incorporated C-O-C groups [53]) leads to the reduction of... 

Polymer Surface energy, total, mJ/m Surface energy, dispersion component, mJ/m Surfaee energy, polar component, mJ/m ... 

Surface Characterization. Several analytical methods were used in characterizing the modified polymer surfaces. Energy Dispersive X-ray (EDX) spectra and electron micrographs of the surfaces were obtained using a JEOL JSM-IC848 scanning electron microscope in order to confirm the presence of phosphorus and chlorine. 

Related articles are Adsorption theory of adhesion. Contact angles and interfacial tension. Dispersion forces. Pre-treatment of metals prior to bonding. Roughness of surfaces. Surface characterization by contact angles-polymers. Surface energy and Wetting and spreading. 

Alkali can be generated by the cathodic half of a corrosion reaction or the cathodic reaction may be driven by means of an electrical potential. When the cathodic reaction occurs between the rubber and metal surface the pH of the solution under the rubber may be as high as 14. Many factors (summarised by Leidheiser [3]) concerned with cathodic delamination are detailed. No definitive mechanism for this type of delamination has been determined although a number of suggestions have been put forward [3]. These include alkaline attack on the polymer, surface energy considerations and attack of the oxide at the interface. 

H2O (film, 25°C) Polymer surface energy (m N/m) Critical surface tension 7 (dyn/cm) Vickers microhardness Hy (kg/mm ) 18.4x10- 58.8 49.9/54.1 See corresponding 11-24 chapter of this Handbook Where M is the molecular weight of the penetrant gas Calculated fi om cohesion parameters and refi actometiic data Hy is a function of load L (L = 20-60 g) Sample film 87 88 89... 

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