Bd. Pennington et Mw. Urban, Rheo-photoacoustic (RPA) FT-IR spectroscopic studies of the adhesion of thermosets to polyolefins, J ADHES SCI, 13(1), 1999, pp. 19-34
Interfacial forces responsible for the adhesion of a coating are influenced
by the nature and magnitude of the interactions between the coating and th
e substrate, When stresses are applied, these interactions may be altered,
resulting in potential energy changes within the neighboring layers of macr
omolecules forming an interfacial region. In this work, rheo-photoacoustic
(RPA) Fourier transform infrared (FT-IR) analysis and previously developed
theory were utilized in an attempt to correlate molecular-level interaction
s in polymer bilayer systems under elongational deformations and changes in
potential energy, leading to determination of the work Of adhesion (W-A).
This research expands the scope of previous findings and provides a relatio
nship between the C-H stretching vibrational energy changes for acrylic/pol
yethylene (ACR/PE), epoxy/polyethylene (EP/PE), acrylic/polypropylene (ACR/
PP), and epoxy/polypropylene (EP/PP) bilayer systems and the interfacial fo
rces responsible for adhesion. Using the vibrational energies of the C-H st
retching bands and their response to the elongational forces imposed at the
interface, the WA values were determined for ACR/PE, EP/PE, EP/PP, and ACR
/PP. These experiments also indicated that there is a correlation between W
A and the glass transition temperature (T-g) of the top coating.