TY - JOUR
T1 - Adhesive properties of acrylate copolymers
T2 - Effect of the nature of the substrate and copolymer functionality
AU - Peykova, Yana
AU - Lebedeva, Olga V.
AU - Diethert, Alexander
AU - Müller-Buschbaum, Peter
AU - Willenbacher, Norbert
N1 - Funding Information:
Financial support by the Deutsche Forschungsgemeinschaft (DFG) under grant numbers WI 3138/2 and MU1487/6 is gratefully acknowledged. We thank Dr. U. Licht (BASF) for providing of the model copolymers. We also thank D. Paul for invaluable help with upgrading the Texture Analyzer, A. Reif for polishing the probes, Dr. Svetlana Guriyanova for support by SPM measurements, A. Kienzler for characterization of the probes using white light confocal microscope NanoFocus μSurf ® and Prof. S. Neser for adapting the features of Visiometrics Image Processing System software.
PY - 2012/4
Y1 - 2012/4
N2 - The adhesion behavior of statistical, uncrosslinked butyl acrylate-methyl acrylate copolymer on different surfaces (stainless steel, polyethylene, glass and Si-wafer) has been investigated using a combination of probe tack test and simultaneous video-optical imaging. Tack and stress peak values increase and the final number of cavities as well as cavity growth rate decreases with increasing surface energy of the substrate due to better wetting. The influence of the incorporation of an additional comonomer, namely, hydroxyethyl acrylate, methyl methacrylate and acrylic acid, on the adhesion of statistical, uncrosslinked butyl acrylate-methyl acrylate copolymer has been studied. Steel probes with different average surface roughness (R a=2.9 and 291.7 nm) have been used for tack tests. The increasing polarity of the incorporated comonomer has no measurable effect on the surface tension but leads to an increase of shear modulus and consequently, to an increase in the stress peak, deformation at break, tack values, as well as the total number of cavities. The latter is a consequence of worse wetting. Cavity growth rate on the smooth surface is insensitive to copolymer composition, on the rough surface, the increase in the modulus associated with the additional monomers, leads to a decrease in the cavity growth rate. This indicates different cavity growth mechanisms: predominately lateral growth on the smooth surface and omnidirectional growth on the rough surface. The adhesion performance of uncrosslinked and crosslinked butyl acrylate-methyl acrylate copolymers is compared. The latter exhibit adhesive, and the former cohesive failure. The total number of cavities and cavity growth rate is found to be controlled by viscoelastic properties of PSA independent of the debonding mechanism and the latter decreases significantly with increasing shear modulus.
AB - The adhesion behavior of statistical, uncrosslinked butyl acrylate-methyl acrylate copolymer on different surfaces (stainless steel, polyethylene, glass and Si-wafer) has been investigated using a combination of probe tack test and simultaneous video-optical imaging. Tack and stress peak values increase and the final number of cavities as well as cavity growth rate decreases with increasing surface energy of the substrate due to better wetting. The influence of the incorporation of an additional comonomer, namely, hydroxyethyl acrylate, methyl methacrylate and acrylic acid, on the adhesion of statistical, uncrosslinked butyl acrylate-methyl acrylate copolymer has been studied. Steel probes with different average surface roughness (R a=2.9 and 291.7 nm) have been used for tack tests. The increasing polarity of the incorporated comonomer has no measurable effect on the surface tension but leads to an increase of shear modulus and consequently, to an increase in the stress peak, deformation at break, tack values, as well as the total number of cavities. The latter is a consequence of worse wetting. Cavity growth rate on the smooth surface is insensitive to copolymer composition, on the rough surface, the increase in the modulus associated with the additional monomers, leads to a decrease in the cavity growth rate. This indicates different cavity growth mechanisms: predominately lateral growth on the smooth surface and omnidirectional growth on the rough surface. The adhesion performance of uncrosslinked and crosslinked butyl acrylate-methyl acrylate copolymers is compared. The latter exhibit adhesive, and the former cohesive failure. The total number of cavities and cavity growth rate is found to be controlled by viscoelastic properties of PSA independent of the debonding mechanism and the latter decreases significantly with increasing shear modulus.
KW - Acrylate copolymers
KW - Pressure-sensitive
KW - Rheology
KW - Tack
KW - Viscoelasticity
UR - http://www.scopus.com/inward/record.url?scp=84856444212&partnerID=8YFLogxK
U2 - 10.1016/j.ijadhadh.2011.12.001
DO - 10.1016/j.ijadhadh.2011.12.001
M3 - Article
AN - SCOPUS:84856444212
SN - 0143-7496
VL - 34
SP - 107
EP - 116
JO - International Journal of Adhesion and Adhesives
JF - International Journal of Adhesion and Adhesives
ER -