Chemically recyclable thermoplastics from reversible-deactivation polymerization of cyclic acetals

被引:298
|
作者
Abel, Brooks A. [1 ,2 ]
Snyder, Rachel L. [1 ,2 ]
Coates, Geoffrey W. [1 ,2 ]
机构
[1] Cornell Univ, Dept Chem & Chem Biol, Ithaca, NY 14853 USA
[2] Cornell Univ, Baker Lab, Joint Ctr Energy Storage Res, Ithaca, NY 14853 USA
关键词
LIVING CARBOCATIONIC POLYMERIZATION; RING-OPENING POLYMERIZATION; CATIONIC-POLYMERIZATION; WASTE; COPOLYMERIZATION; CATALYSTS; POLYMERS; MONOMERS;
D O I
10.1126/science.abh0626
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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.
引用
收藏
页码:783 / +
页数:123
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