Effect of Hard Segment Content on Peel and Tack of PolyurethanePressure-Sensitive Adhesives

The hard segment content in polyurethane pressure-sensitive adhesives (PU PSAs) significantlyaffects their adhesion properties. To study the effect of this parameter on peel force and tack of PUPSAs, four formulations comprised of polypropylene glycol with a molecular weight of ۲۰۰۰ g/mol,۴,۴ʹ-diphenylmethane diisocyanate, and ۱,۴-butanediol were synthesized at a fixed NCO/OH of ۱.The studies showed that the increase in the hard segment content up to ۱۸% led to an increase in thepeel force and tack of the PU PSAs, though with failure modes of adhesive from the backing andcohesive, respectively. However, at a hard segment content of ۲۰%, the PU PSA debonded adhesivelyfrom the substrate, still exhibiting a suitable tack.

کلیدواژه ها:

Adhesives ، PU PSAs ، Hard Segment Content ، Peel Force ، Tack ، Failure Mode