Cure Kinetic of Polyurethane/Fluorinated POSS Hybrid

One of the decisive factors in obtaining the desired properties in coatings is their complete curing, which necessitates the study of kinetics of curing. In recent years, many studies have been conducted on the use of polyhedral oligomeric silsesquioxane (POSS) in coatings. Creating functional groups on POSS and using it in formulation can create new or improve the properties of coatings. In this study, the cure kinetics between hydroxyl functional acrylic resin, aliphatic polyisocyanate and fluorinated POSS with terminal hydroxyl group (F-POSS-OH) was studied using both the Malek and model-free isoconversional method (Flynn-Wall-Ozawa and Kissingere-Akahirae-Sunose) by DSC. The parameters of the cure kinetic equation for both systems were calculated and the effect of F-POSS-OH on the activation energy of polyurethane systems is investigated by free models. The results are shown that the m parameter in the cure kinetic equation for the coatings containing the F-POSS-OH increased, which indicates an increase in the autocatalytic effect of the curing system. Also, in the free model, the F-POSS-OH was reduced the activation energy of reaction.