Comparison of Tack of Pressure-Sensitive Adhesives (PSAs) at Different Temperatures

Abstract

Pressure-sensitive adhesives (PSAs) have applications in the fields of packaging, joining, wound care, and personal care. Depending on the application of the PSA, different performance tests are carried out when new products are developed or the quality of the existing products is checked. Tack is the property of an adhesive that enables it to form instant bond on the surface under light pressure. The tack of a PSA strongly depends on the way the bond is created. Parameters such as the bonded area, contact time and the nature of tack materials all affect the tack force measured. In the development of any PSA, it is desirable to correlate the performance related properties such as tack and peel strength to the rheological behaviour. Finding these correlations would make it possible to evaluate the performance of a PSA using its rheological characteristics. In this investigation we have studied the influence of rheological behaviour of three different PSAs on their tackiness. The three different PSAs used in this study are a low molecular weight rosin ester, high molecular weight rosin ester, and dicyclopentadiene. Various rheological properties such as viscosity, phase angle, and elastic and viscous moduli are measured versus the frequency and temperature. Also the tack properties at various removal speeds and temperatures are evaluated. Analysis of the results indicates different performances of the three PSAs which could be related to their rheological properties, especially the phase angle, at different frequencies and temperatures. The PSA with high molecular weight rosin ester is more sensitive to temperature changes and showed drastic changes in tackiness from high temperature to low temperature. On the other hand, rosin ester with low molecular weight is less sensitive to temperature changes.

Enhancement of Pressure‐Sensitive Adhesive by CO2 Laser Treatment

“…PSAs experience a decrease in elastic and viscous moduli with increased temperature. [ 27 ] To evaluate this parameter for a treated VHB, the experiments under different annealing temperatures of −18, 20, and 40 °C were performed using the regular peeling test protocol. The samples are stored under each one of the aforementioned temperatures, but the peeling test was performed at 20 °C.…”

Effect of temperature and humidity on mechanical properties and constitutive modeling of pressure-sensitive adhesives

“…In the realm of mechanical performance studies of PSAs, various investigations have provided insights into their behavior under different environmental and loading conditions. Chiang et al utilized rheological tests to evaluate the influence of frequency and temperature on the viscosity of PSAs, uncovering a pronounced temperature sensitivity 8 . Their findings indicated a sharp decline in viscoelastic properties when transitioning from high to low temperatures, and they noted that PSAs with higher elastic moduli do not consistently exhibit increased tack across varying temperature conditions and phase angles.…”

Compositional effect on the deformation behavior of polyurethane pressure‐sensitive adhesive thin films

“…While EHA films showed some fibrillation but without clear detachment. Chiang et al ., have reported the rheological studies of three PSAs of different composition of low‐ and high‐molecular‐weight rosin ester along with dicyclopentadiene. They concluded that the sensitivity of high‐molecular‐weight rosin toward temperature‐dependent rheological properties was greater than that of low‐molecular‐weight compound; it was directly related to change in tack behavior.…”