关键字：MACROMOLECULAR SCIENCE VIEWPOINT; THERMAL-DEGRADATION; POLYETHYLENE TEREPHTHALATE; 100TH ANNIVERSARY; POLYMERIZATION; ALKALINE; WASTE; POLYHYDROXYBUTYRATE; DEPOLYMERIZATION; MECHANISM
摘要：The chemical recycling of plastic wastes into value-added products is an attractive strategy to reduce the consumption of fossil fuels and reduce the plastic pollution. We report here the facile upcycling of poly(3-hydroxybutyrate) (P3HB) into value-added polymerizable monomers and subsequent polymerization toward degradable and recyclable polymers. The bicyclic monomer 4-methyloctahydro-2H-benzo[b][1,4]dioxepin-2-one (4-MOHB) was first synthesized from P3HB through efficient steps. The obtained monomers underwent bulk ring-opening polymerization (ROP) catalyzed by stannous octoate (Sn(Oct)(2)) to give the amorphous materials. With benzyl alcohol (BnOH) as an initiator, Sn(Oct)(2) can effectively catalyze the ROP of bicyclic ether-ester monomers in a controllable fashion. Moreover, poly(4-methyloctahydro-2H-benzo[b][1,4]dioxepin-2-one) (P(4-MOHB)) showed a closed-loop recovery property due to the fused bicyclic monomer structure. The selective depolymerization of the P(4-MOHB) homopolymer back to 4-MOHB monomer can be easily realized using p-toluenesulfonic acid (TsOH) or Sn(Oct)(2) as a catalyst in solution or in bulk. This strategy to recycle bioplastics into value-added materials has a promising application prospect and is beneficial to extend the life cycle of environmentfriendly materials.
卷号：10
期号：25
是否译文：否