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Influence of Polyol Molecular Weight and Type on the Tack and Peel Properties of Waterborne Polyurethane Pressure‐ S ensitive Adhesives
Author(s) -
Akram Nadia,
Gurney Robert S.,
Zuber Mohammad,
Ishaq Muhammad,
Keddie Joseph L.
Publication year - 2013
Publication title -
macromolecular reaction engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 32
eISSN - 1862-8338
pISSN - 1862-832X
DOI - 10.1002/mren.201300109
Subject(s) - polyurethane , polyol , polybutadiene , adhesive , materials science , polypropylene glycol , composite material , adhesion , diol , polymer chemistry , chemical engineering , polymer , copolymer , polyethylene glycol , layer (electronics) , engineering
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.