Effect of Polyol Molecular Weight on Adhesion Properties of a PolyurethanePressure-Sensitive Adhesive

The polyols molecular weight (MW) used in the synthesis of polyurethane pressure-sensitiveadhesives (PU PSAs) has a significant effect on their adhesion properties. Although the effect ofreducing the MW of polyols to less than ۲۰۰۰ g/mol on adhesion properties has been studied in theliterature, the effect of higher MW polyols has been overlooked, which is the subject of the currentresearch. Herein, PSAs were synthesized using polypropylene glycols with molecular weights of۲۰۰۰ and ۴۰۰۰ g/mol at a fixed NCO/OH of ۱.۱ and a hard segment content of ۱۷%. Although byincreasing the molecular weight of the polyol, the peel force and loop tack of the PSA decreasedsignificantly, albeit with the desired change in its failure mode, the dynamic shear strength improved.

کلیدواژه ها:

Adhesive ، Polyurethane ، Molecular Weight ، Peel Force ، Loop Tack ، Dynamic Shear