Combinatorial Development of Pressure‐Sensitive Adhesives

Abstract

We have developed novel pressure-sensitive adhesives (PSAs) which could be peeled off easily on ultrasonic irradiation as external stimuli. The PSAs were composed of acid-degradable polyurethanes and microcapsules containing a thermal acid generator (TAG). Three layered (w/o/w) type microcapsules containing a TAG were prepared by coacervation method. Generation of acid from the microcapsules and PSA layers on ultrasonic irradiation in water was confirmed by pH changes. Peel strength of PSAs containing the microcapsules decreased from 10 to 1 N/20mm on ultrasonic irradiation in water at 28 kHz for 20 min. The peel strength of PSAs containing the microcapsules was constant on heating up to 80 °C for 1 h, while that decreased on heating above 80 °C. These results suggest that acid was generated but kept in microcapsules on heating up to 80 °C, and the acid was released from microcapsules when PSAs were ultrasonic irradiated or heated above 80 °C.

Combinatorial and High‐Throughput Materials Science

“…Profile parameters related to tack, peel, and shear were obtained for evaluation of each potential adhesive. [315] A high-throughput method for screening moisture vapor transmission rates (MVTR) of polymeric barrier films has been developed that is based on a nafion-crystal violet (CVN) sensor that changes color from yellow to green upon absorption of water. HTS was demonstrated by depositing 20 emulsion-based PVC films of varying thicknesses onto the CVN sensor film and aging them at 40 8C and 90 % relative humidity for 72 h. MVTR values were accurately determined to a level of 0.9 g m À2 day À1 .…”

Gradient and Microfluidic Library Approaches to Polymer Interfaces

“…Since one needs to measure both force and displacement, it is difficult to design a parallel screening approach to this measurement platform. Therefore, the focus has been primarily on developing appropriate combinatorial libraries that span the parameter space of interest, while employing single point measurements of probe tack [85,86]. At NIST we used this approach to examine the effect of temperature on the adhesive properties of model PSAs (see Fig.…”

Combinatorial and High‐Throughput Methods in Macromolecular Materials Research and Development

“…Grunlan and co-workers at Avery Dennison explored the development of combinatorial methods for pressure-sensitive adhesives, including testing methods for tack, peel, and shear properties. [159] They also developed methods for rapidly determining film thickness [160] and for testing polymer films and coatings for their water vapor transport properties. [161,162] A workflow for the fabrication and testing of polymer-based light-emitting diodes (LEDs) has been described.…”