Influence of Polyol Molecular Weight and Type on the Tack and Peel Properties of Waterborne Polyurethane Pressure‐Sensitive Adhesives

Abstract

A requirement for optimum performance in a pressure-sensitive adhesive (PSA) is the right balance between viscous and elastic properties, achieved by controlling the molecular architecture. Here, waterborne polyurethane PSAs are synthesized using a blend of polyether and polyalkene-based polyols. The effects of the polyol type and molecular weight on the adhesive and thermomechanical properties are explored to optimize them for PSA applications. A linear polyurethane is synthesized by the reaction of an aliphatic diisocyanate with a diol blend of polypropylene glycol (PPG) and hydroxyl-terminated polybutadiene (HTPB). With increasing concentrations of flexible HTPB segments and the associated increased viscous dissipation a favorable increase in the tack adhesion energy and peel strength is obtained. Adhesive properties are improved with increasing PPG molecular weight because chain entanglements become possible in the soft segments and raise the storage modulus. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Impact of macrodiols on the adhesion strength of polyurethane pressure‐sensitive adhesives

“…Table shows that the adhesion energy of the system also improved from 32.0 to 62.0 J/m 2 for the same group of MD1. These energy values were higher than those in our previous results from the HD1 group . The mechanism of debonding suggested ultimate adhesive failure.…”

“…The synthesis of the suspensions were carried out by our previously reported method . The synthesis of the water‐dispersed PU suspension was carried out by a multistep process of mixing the individual components.…”

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

“…A detailed description of synthesis of waterborne PSA's has been reported in our previous work . The precisely calculated quantities of macrodiols (PPG and HTPB) and diisocyanate (IPDI) were reacted in the first step.…”

“…A detailed description of synthesis of waterborne PSA's has been reported in our previous work. [23][24][25][26] The precisely calculated quantities of macrodiols (PPG and HTPB) and diisocyanate (IPDI) were reacted in the first step. This reaction was aided by DMPA and DBTDL (1.0 wt % of the solid contents) to produce the prepolymer chains.…”

Recent Advances in Synthesis and Characterization of Adhesives

“…In the current article series entitled “Recent Advances in Synthesis and Characterization of Adhesives,” the latest word on such advances in the synthesis and characterization of adhesives is highlighted. These latest advances in Adhesion Science, Engineering, and Technology are presented by the “Who's Who” internationally in the area, firstly on the synthesis of various types of modern adhesives . Different synthesis methods are discussed along with details on the effects of the properties of the initial adhesive components and also those of the applied synthesis method toward the final properties of the synthesized adhesives .…”