Chemical upcycling of poly(lactide) plastic waste to lactate ester,lactide and new poly(lactide) under Mg-catalysis condition |
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| Affiliation: | 1. College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China;2. Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China;3. Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China;1. Biorefinery Research Group, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeongro, Yuseong, Daejeon 305-600, Republic of Korea;2. University of Science and Technology (UST), 113 Gajeongro, Yuseong, Daejeon 305-333, Republic of Korea;3. Department of Chemistry, Sungkyunkwan University, Suwon 440-476, Republic of Korea |
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| Abstract: | Chemical upcycling of end-of-life poly(lactide) plastics to lactide, lactate ester and new poly(lactide) has been achieved by using magnesium bis[bis(trimethylsilyl)amide] [Mg(HMDS)2] as promoter. Mg(HMDS)2 showed high efficiency in l-lactide polymerization and poly(lactide) depolymerization. Mg(HMDS)2/Ph2CHOH catalytic system displayed high ring-opening selectivity and the characteristic of immortal polymerization. Taking advantage of transesterification, depolymerizations of end-of-life poly(lactide) plastics to lactate ester (polymer to value-added chemicals) and lactide (polymer to monomer) were achieved with high yields. Besides, a new “depolymerization-repolymerization” strategy was proposed to directly transform poly(lactide) into new poly(lactide). This work provides a theoretical basis for the design of polymerization and depolymerization catalysts and promotes the development of degradable polymers. |
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