Abstract
A series of novel stable resins by degradation of poly(ethylene terephthalate) by oligoesterdiols based on dimerized fatty acid were obtained. For comparison purposes, noncrystallizing resins based on petrochemical substrates, i.e. adipic acid, diethylene glycol and phthalic anhydride were obtained too. Within the framework of the presented studies, a number of syntheses were carried out in order to determine how the qualitative and quantitative composition of individual reagents affects the properties of the obtained binder: tendency to crystallize over time, viscosity, glass transition temperature, average molecular weight, dispersion. Two-stage degradation of waste poly(ethylene terephthalate) by using oligoesterdiols based on dimerized fatty acid and diethylene glycol, and then oligoesterdiols based on adipic acid and diethylene glycol, allowed to obtain stable resins. They were characterized by low glass transition temperature in the range of −46 to −57 °C and relatively low viscosity from 720 to 2420 mPa·s. It was possible to use them as binders in polyurethane coatings. The resulting coatings were smooth, homogeneous and hydrophobic.
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