CONTROLLING OF PRESSURE SENSITIVE ADHESIVE PROPERTIES BY BLENDING POLY(VINYLIDENE FLUORIDE-CO-HEXAFLUORO ACETONE) INTO POLY(ETHYLACRYLATE) ADHESIVE

The pressure sensitive adhesive (PSA) properties of the poly(ethyl acrylate) (PEA)/poly(vinylidene fluoride-co-hexafluoro acetone) [P(VDF-HFA)] blends were investigated with blend compositions of P(VDF-HFA) contents from 0 to 50 wt%. PSA properties, such as 180-degrees peel adhesion, J. Dow ball tack and probe tack, decreased with increasing P(VDF-HFA) content, whereas holding power increased. The effects of the morphology, critical surface tension gamma-c and dynamic mechanical properties on the PSA properties of the PEA/P(VDF-HFA) blends were also investigated. The morphology and gamma-c values were changeless in blends with P(VDF-HFA) contents varied from 0 to 50 wt% region. On the other hand, dynamic mechanical properties, such as the storage modulus G', loss modulus G" and glass transition temperature T(g) increased monotonically with increasing P(VDF-HFA) content in the blends. Therefore, it was expected that PSA properties in PEA blends could be controlled with P(VDF-HFA) contents in relation to G', G" and T(g) properties.