In order to utilize renewable resource raw materials as well as trying to recycle polymeric materials, three new polyols (PEEA1-3) were prepared. Bottle grade recycled poly(ethylene terphthalate) was subjected to transesterification and an amidation reaction with different molecular weights of poly(ethylene glycol) and diethanol amine. The intermediate hydroxyl-terminated compounds were chain extended via an esterification reaction with adipic acid and the products were reacted with castor oil. Polyurethane networks were prepared through the reaction of PEEA1-3 with librated isocyanate groups of a blocked isocyanate curing agent made from trimethylol propane, toluene diisocyanate and N-methyl aniline. All of the starting materials and final cured films were characterized by conventional methods. The curing condition was optimized via gel content measurements. The crosslink density of the samples was determined via an equilibrium swelling method, using the Flory-Rehner equations. The effects of structural parameters on the physical, electrical, mechanical, and dynamic mechanical properties of the polyurethane coatings were evaluated. Investigation of the results showed that the prepared green coatings have environmental benefits as well as high performance as metal insulator coatings.

A novel series of one-pack solvent borne polyurethane-urea insulating coatings was prepared from hydroxyl-terminated prepolymers (HTP) and blocked isocyanate curing agent (BIC). HTP was prepared from poly z(tetramethylene ether)glycol (PTMEG) with excess amount of toluene diisocyanate (TDI) and subsequent reaction of NCO-terminated polyurethane with tris(hydroxymethyl-aminomethane) (TRIS). BIC was prepared from the reaction of trimethylol propane, TDI, and N-methyl aniline. HTP, BIC, and final products were characterized by conventional methods, and the curing condition was optimized via gel content measurements. Crosslink density of samples was determined via equilibrium swelling method, using Flory-Rehner equations. Thermal, mechanical, and electrical properties as well as the chemical resistance of prepared coatings were evaluated and compared with commercially available formulations. Effects of structural parameters on physical, electrical, mechanical, and dynamic mechanical (DMTA) properties of the polyurethane-urea coatings were investigated. The investigation of results showed superior electrical and mechanical properties of prepared green coating as a tailor-made electrical insulator for metals.

To utilize renewable resource raw materials as well as trying to recycle polymeric materials, three new polyols (PEE1-3) were prepared from trasesterification reaction of postconsumer poly(ethylene terephtalate) (PET), different molecular weights of poly(ethylene glycol) (PEG), and glycerine. The intermediate hydroxyl-terminated compounds were chain extended via esterification reaction with adipic acid (AA), and the products were reacted with castor oil (CO). These polyols were cured by blocked isocyanate (BIC) made from trimethylol propane, toluene diisocyanate, and N-methyl aniline. All of starting materials and final films were characterized by conventional methods. Curing condition was optimized via gel content measurements. Crosslink density of samples was determined via equilibrium swelling method, using Flory-Rehner equations. Effects of structural parameters on physical, electrical, mechanical, and dynamic mechanical (DMTA) properties of the polyurethane coatings were investigated.Comparison of results with commercially available product shows that the prepared green coatings have environmental benefits as well as high performance for metal insulator coatings too.