2021 Volume 57 Issue 3 Pages 99-104
The stringiness behavior during 180° peel testing was observed for crosslinked poly（ n-butyl acrylateacrylic acid）（ A） and poly（2-ethylhexyl acrylate-acrylic acid）（ B） with a constant crosslinker level. A fused quartz plate was used as adherend. The adhesive thickness and tensile rate were varied over the range from 15 to 60 µm and from 0.017 to 5 mm·s-1, respectively. The peel strength increased with the increase of tensile rate and adhesive thickness. The peel strength for the specimen with the same adhesive thickness was B > A. The sawtooth-type peeling with a front frame was observed only for B with the adhesive thicknesses of 15 and 30 µm and with low tensile rate. In all other cases, no frame type was observed. The sawtooth length decreased with the increase of tensile rate and the decrease of adhesive thickness. It was B > A under the condition of the same tensile rate. There is good relation between the peel strength and the sawtooth length below the tensile rate of 0.5 mm·s-1 when the result with the same tensile rate was compared.
