Developing new chemically recyclable polymers is important for a circular plastics economy.Herein,we prepared a class of 1,4-dithian-2-one(DTO)with thioether and thioester functionalities.These sulfur-substituted mono...Developing new chemically recyclable polymers is important for a circular plastics economy.Herein,we prepared a class of 1,4-dithian-2-one(DTO)with thioether and thioester functionalities.These sulfur-substituted monomers(DTO)showed excellent reactivity for ring-opening polymerization(turnover frequency(TOF)up to 2.3×10^(4)h^(-1)),which afforded poly(thioetherthioester)s(P(DTO)s)with high air stability,high crystallinity,and commercial high-density polyethylene-like mechanical property(σB=29.59±1.08 MPa andεB=749%±36%).Intriguingly,chemical recycling of P(DTO)to monomer could be accomplished with excellent efficiency in dilute solution(1 min)at room temperature or even from a commodity plastic waste mixture under catalyst-free thermal bulk condition(180°C),thus establishing its circular life cycle.P(Me-DTO)could be applied for selective removal of Hg^(2+)with>99%removal efficiency.More importantly,Me-DTO could be recovered in high yield after utilization for Hg^(2+)adsorption.展开更多
基金supported by the National Key R&D Program of China(2021YFA1501700)the National Natural Science Foundation of China(51903177,U19A2095)+1 种基金the“1000-Youth Talents Program”the Fundamental Research Funds for the Central Universities(YJ201924,YJ202209)。
文摘Developing new chemically recyclable polymers is important for a circular plastics economy.Herein,we prepared a class of 1,4-dithian-2-one(DTO)with thioether and thioester functionalities.These sulfur-substituted monomers(DTO)showed excellent reactivity for ring-opening polymerization(turnover frequency(TOF)up to 2.3×10^(4)h^(-1)),which afforded poly(thioetherthioester)s(P(DTO)s)with high air stability,high crystallinity,and commercial high-density polyethylene-like mechanical property(σB=29.59±1.08 MPa andεB=749%±36%).Intriguingly,chemical recycling of P(DTO)to monomer could be accomplished with excellent efficiency in dilute solution(1 min)at room temperature or even from a commodity plastic waste mixture under catalyst-free thermal bulk condition(180°C),thus establishing its circular life cycle.P(Me-DTO)could be applied for selective removal of Hg^(2+)with>99%removal efficiency.More importantly,Me-DTO could be recovered in high yield after utilization for Hg^(2+)adsorption.
