M.M. Mazurek-Budzyńska, G. Rokicki, K. Paśnik
Utilization of poly(ethylene terephthalate) waste in the synthesis of air-drying polyester
alkyd resins and aliphatic-aromatic poly(ester-carbonate)s) (in English)
Polimery 2016, No 9, 600
Two methods of chemical recycling of poly(ethylene terephthalate) (PET) waste with simultaneous recovery of ethylene glycol were described. In the synthesis of the air-drying alkyd polyester resin phthalic anhydride was replaced with phthalic acid. The resin was obtained in one pot process in which PET waste was reacted with incomplete esters of pentaerythritol and glycerol with unsaturated fatty acids. The side product – ethylene glycol was removed from the reaction mixture by azeotropic distillation. To reduce amounts of volatile organic compounds (VOC) in the lacquers the obtained resins were modified with dibutyl sulfosuccinate sodium salt, and aqueous dispersions were prepared. Drying times and hardness of coatings prepared on the basis of alkyd polyester resins were examined. The second method of recycling consisted in PET reaction with 1,4-butanediol afforded oligo(tetramethylene terephthalate) (OTMT). Thisoligomer was subjected to a transesterification reaction with oligo(tetramethylene carbonate) (OTMC) to form a high molar mass poly(tetramethylene terephthalate-co-tetramethylene carbonate)s (PTMTC). Theresulting copolyesters were characterized with NMR and FT-IR spectroscopies, mass spectrometry MALDI-TOF, DSC and mechanical testing. The effect of carbonate unit content on tensile strength and elongation at break, as well as thermal properties was also evaluated.
: poly(ethylene terephthalate) waste, air-drying polyester alkyd resin, water-thinnable resin, oligo(tetramethylene carbonate), poly(ester-carbonate)
- M.M. Mazurek-Budzyńska, G. Rokicki, K. Paśnik (967.4 KB)
- Utilization of poly(ethylene terephthalate) waste in the synthesis of air-drying polyester alkyd resins and aliphatic-aromatic poly(ester-carbonate)s)