A novel UV-curable oligmer 1,4-cyclohexanedimethanol glycidyl ether acrylate（CHDMGEA） was synthesized by utilizing 1,4-cyclohexanedimethanol glycidyl ether（CHDMGE） and acrylic acid（AA） as starting materials, tri...A novel UV-curable oligmer 1,4-cyclohexanedimethanol glycidyl ether acrylate（CHDMGEA） was synthesized by utilizing 1,4-cyclohexanedimethanol glycidyl ether（CHDMGE） and acrylic acid（AA） as starting materials, triphenyl phosphine as catalyst and p-hydroxyanisole as inhibitor. The optimum synthetic conditions were that the concentration of triphenyl phosphine was 0.90% of reactants by weight, the concentration of p-hydroxyanisole was 0.20% of reactants by weight, the reaction temperature was 90-100 ℃, and the molar ratio of CHDMGE to AA was 0.5：1.1. The experimental results show that CHDMGEA is a kind of good UV-curable oligmer. The impact resistance of the UV-cured films with CHDMGEA as oligmer to prepare UV-curing coating was superior to that of the UV-cured films with bisphenol A diglycidyl ether diacrylate（BPGEA） as oligmer to prepare UV-curing coating.展开更多
The recycling of waste polyethylene terephthalate(PET),an extensively used polymer as plastic and fiber materials,has become an urgent topic due to the rapid generation and accumulation of plastic waste into the envir...The recycling of waste polyethylene terephthalate(PET),an extensively used polymer as plastic and fiber materials,has become an urgent topic due to the rapid generation and accumulation of plastic waste into the environment.Current chemical recycling approaches to depolymerize and convert PET into 1,4-cyclohexanedimethanol(CHDM),an important chemical in the production of advanced polyesters,predominantly use organic solvents,such as alcohols or dioxane.Herein,we developed an environmentally friendly and economically viable pathway for converting PET to CHDM using water as the solvent.In this process,PET is sequentially hydrolyzed in water,hydrogenated to 1,4-cyclohexane dicarboxylic acid(CHDA),and then reduced to CHDM.The PET conversion rate is self-enhanced in aqueous medium via acid-catalyzed hydrolysis by the generated CHDA intermediate.A Pd-based catalyst(e.g.,Pd/C)selectively hydrogenates the arene ring of the PET monomer,terephthalic acid intermediate,and a Ru-Sn/C bimetallic catalyst reduces its COOH to CH_(2)OH group.At optimized reaction conditions,a complete conversion of PET and 80.1%yield of CHDM are obtained.Alternatively,this approach can also efficiently produce CHDA from PET,with a yield up to 86.4%.展开更多
基金Funded by the Natural Science Foundation of Jiangxi Province(20142BAB206029)
文摘A novel UV-curable oligmer 1,4-cyclohexanedimethanol glycidyl ether acrylate（CHDMGEA） was synthesized by utilizing 1,4-cyclohexanedimethanol glycidyl ether（CHDMGE） and acrylic acid（AA） as starting materials, triphenyl phosphine as catalyst and p-hydroxyanisole as inhibitor. The optimum synthetic conditions were that the concentration of triphenyl phosphine was 0.90% of reactants by weight, the concentration of p-hydroxyanisole was 0.20% of reactants by weight, the reaction temperature was 90-100 ℃, and the molar ratio of CHDMGE to AA was 0.5：1.1. The experimental results show that CHDMGEA is a kind of good UV-curable oligmer. The impact resistance of the UV-cured films with CHDMGEA as oligmer to prepare UV-curing coating was superior to that of the UV-cured films with bisphenol A diglycidyl ether diacrylate（BPGEA） as oligmer to prepare UV-curing coating.
基金supported by the National Natural Science Foundation of China(22472059,22302069)the Natural Science Foundation of Shanghai(23ZR1418800)the Fundamental Research Funds for the Central Universities(YBNL TS202307)。
文摘The recycling of waste polyethylene terephthalate(PET),an extensively used polymer as plastic and fiber materials,has become an urgent topic due to the rapid generation and accumulation of plastic waste into the environment.Current chemical recycling approaches to depolymerize and convert PET into 1,4-cyclohexanedimethanol(CHDM),an important chemical in the production of advanced polyesters,predominantly use organic solvents,such as alcohols or dioxane.Herein,we developed an environmentally friendly and economically viable pathway for converting PET to CHDM using water as the solvent.In this process,PET is sequentially hydrolyzed in water,hydrogenated to 1,4-cyclohexane dicarboxylic acid(CHDA),and then reduced to CHDM.The PET conversion rate is self-enhanced in aqueous medium via acid-catalyzed hydrolysis by the generated CHDA intermediate.A Pd-based catalyst(e.g.,Pd/C)selectively hydrogenates the arene ring of the PET monomer,terephthalic acid intermediate,and a Ru-Sn/C bimetallic catalyst reduces its COOH to CH_(2)OH group.At optimized reaction conditions,a complete conversion of PET and 80.1%yield of CHDM are obtained.Alternatively,this approach can also efficiently produce CHDA from PET,with a yield up to 86.4%.
