Chemically recyclable thermoplastics from reversible-deactivation polymerization of cyclic acetals

doi:10.1126/science.abh0626

GSTDTAP > 气候变化

DOI	10.1126/science.abh0626
	Chemically recyclable thermoplastics from reversible-deactivation polymerization of cyclic acetals
	Brooks A. Abel; Rachel L. Snyder; Geoffrey W. Coates
	2021-08-13
发表期刊	Science
出版年	2021
英文摘要	Cyclic acetals such as dioxolane are appealing building blocks for recyclable plastics but have proven to be difficult to polymerize controllably. Abel et al. show that optimal pairing of a bromomethyl ether and indium or zinc Lewis acid produces polydioxolane with high tensile strength that may be advantageous for packaging applications. Heating this plastic in strong acid easily breaks it back down to its acetal monomer, which can then be recovered by distillation from mixed plastic waste streams in high yield. Science , abh0626, this issue p. [783][1] Identifying plastics capable of chemical recycling to monomer (CRM) is the foremost challenge in creating a sustainable circular plastic economy. Polyacetals are promising candidates for CRM but lack useful tensile strengths owing to the low molecular weights produced using current uncontrolled cationic ring-opening polymerization (CROP) methods. Here, we present reversible-deactivation CROP of cyclic acetals using a commercial halomethyl ether initiator and an indium(III) bromide catalyst. Using this method, we synthesize poly(1,3-dioxolane) (PDXL), which demonstrates tensile strength comparable to some commodity polyolefins. Depolymerization of PDXL using strong acid catalysts returns monomer in near-quantitative yield and even proceeds from a commodity plastic waste mixture. Our efficient polymerization method affords a tough thermoplastic that can undergo selective depolymerization to monomer. [1]: /lookup/doi/10.1126/science.abh0626
领域	气候变化 ; 资源环境
URL	查看原文
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/335883
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Brooks A. Abel,Rachel L. Snyder,Geoffrey W. Coates. Chemically recyclable thermoplastics from reversible-deactivation polymerization of cyclic acetals[J]. Science,2021.
APA	Brooks A. Abel,Rachel L. Snyder,&Geoffrey W. Coates.(2021).Chemically recyclable thermoplastics from reversible-deactivation polymerization of cyclic acetals.Science.
MLA	Brooks A. Abel,et al."Chemically recyclable thermoplastics from reversible-deactivation polymerization of cyclic acetals".Science (2021).