Citation: Xianyue Zhou, Qiuyang Liu, Guangqiang Xu, Rulin Yang, Hongguang Sun, Qinggang Wang. Chemical upcycling of poly(lactide) plastic waste to lactate ester, lactide and new poly(lactide) under Mg-catalysis condition[J]. Chinese Chemical Letters, ;2023, 34(10): 108158. doi: 10.1016/j.cclet.2023.108158 shu

Chemical upcycling of poly(lactide) plastic waste to lactate ester, lactide and new poly(lactide) under Mg-catalysis condition

Xianyue Zhou ^{a, b, 1} ,
Qiuyang Liu ^{a, 1} ,
Guangqiang Xu ^{b, c, *,} ,
Rulin Yang ^{b, c} ,
Hongguang Sun ^{a, *,} ,
Qinggang Wang ^{b, c, *,}

a.
College of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
b.
Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
c.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

xu_gq@qibebt.ac.cn

hgsun816@qust.edu.cn

wangqg@qibebt.ac.cn

Received Date: 6 December 2022
Revised Date: 5 January 2023
Accepted Date: 19 January 2023
Available Online: 26 January 2023

Figures(8)

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.
- Upcycling,
- Poly(lactide),
- Mg(HMDS)₂,
- Polymerization,
- Depolymerization
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