Pressure Sensitive Adhesives Based on Epoxidized Soybean Oil: Correlation Between Curing Conditions and Rheological Properties

RUSECKAITE, ROXANA A.; CIANNAMEA, EMILIANO M.

JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY (JAOCS)

SPRINGER

Lugar: Berlin; Año: 2018 vol. 95 p. 525 - 532

0003-021X

Renewable resources, including vegetable oils,can be used as feedstock for the manufacture of pressuresensitive adhesives (PSA) that can compete with thosederived from petrochemical sources, but with the environmentalthe benefit of being sustainable. Completely bio-basedPSA with tunable viscoelastic properties were synthesizedfrom mixtures of epoxidized soybean oil and sebacic acidby a solvent-free one-step reaction, in the absence of a catalyst.Curing conditions and pot-life were determined forformulations with a stoichiometric acid/epoxy ratio. Curingtime ranged from the gel point (tgel) to tgel + 30 min at theselected temperature (170 C) to study the correlationbetween the reaction, rheological behavior, and potentialadhesive performance. These renewable PSA can be tailoredby controlling the curing parameters according to thedesired application, since the rheological profile and gelcontent were greatly dependent on the curing conditions. Inparticular, the obtained adhesives cured at 170 C between65 and 75 min showed the best balance between tack andcohesion.