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Environmentally benign metal catalyst for the ring-opening copolymerization of epoxide and CO_(2): state-of-the-art, opportunities, and challenges

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Green Chemical Engineering 2022年第2期3卷 111-124页

作者： Han Cao Shunjie Liu Xianhong Wang Key Laboratory of polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China

Carbon dioxide(CO_(2))is the main greenhouse gas,whereas it is also a nontoxic,abundant,cheap carbon and oxygen *** copolymerization of CO_(2) with epoxide presents a sustainable approach to the synthesis of biodegradable polymers,which upcycles the waste into *** complex catalyst plays the central role in the reaction,since it provides oxophilic and Lewis acidic active center both for monomer activation and chain end stabilization,and nucleophiles as Lewis base for ***,heavy metal catalyst with certain toxicity such as cobalt undisputedly dominates the copolymerization catalysis which comprises the overall *** circumvent the potential environmental hazard,developing highly active catalyst composed of green metals is of great importance especially when the polymer was utilized for agriculture *** work reviews the development of sustainable metal catalysts for the production of CO_(2) copolymer,centered by Al,Mg,Ti,Fe,generally acknowledged as low toxic,environmentally benign,biocompatible,and also abundant in earth's *** is placed in recent five years where several historic examples are also included to construct a full picture of the sustainable catalysis explored to date.

关键词： Green catalysis Aluminum catalyst sustainable polymer CO_(2)valorization Ring-opening polymerization

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Chemoselective polymerization of Fully Biorenewableα-Methylene-γ-Butyrolactone Using Organophosphazene/Urea Binary Catalysts Toward sustainable Polyesters

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CCS Chemistry 2021年第1期3卷 620-630页

作者： Yong Shen Wei Xiong Yongzheng Li Zhichao Zhao Hua Lu Zhibo Li State Key Laboratory Base of Eco-Chemical Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042 Key Laboratory of Biobased polymer Materials Shandong Provincial Education DepartmentCollege of Polymer Science and EngineeringQingdao University of Science and TechnologyQingdao 266042 Beijing National Laboratory for Molecular Sciences Center for Soft Matter Science and EngineeringKey Laboratory of Polymer Chemistry and Physics of Ministry of EducationCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871

Despite the great potential of biorenewableα-methylene-γ-butyrolactone(MBL)to produce functional,recyclable polyester,the ring-opening polymerization(ROP)of MBL remains a challenge due to the competing polymerization of the highly reactive exocyclic double bond and low-strained five-membered *** this contribution,we present the first organocatalytic chemoselective ROP of MBL to exclusively produce functional unsaturated polyester by utilizing a phosphazene base/urea binary *** show that delicate chemoselectivity can be realized by controlling the temperature and using selected urea *** obtained polyester can be completely recycled back to its monomer by chemolysis under mild *** and theoretical calculations provide mechanistic insights and indicate that the ROP pathway is kinetically favored by using urea with stronger acidity at low temperatures.

关键词： organocatalyst ring-opening polymerization polyester sustainable polymer recyclability

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