Chemically circular, mechanically tough, and melt-processable polyhydroxyalkanoates

Polyhydroxyalkanoates (PHAs) have attracted increasing interest as sustainable plastics because of their biorenewability and biodegradability in the ambient environment. However, current semicrystalline PHAs face three long-standing challenges to broad commercial implementation and application: lack...

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Published in:Science (American Association for the Advancement of Science) 2023-04, Vol.380 (6640), p.64-69
Main Authors: Zhou, Li, Zhang, Zhen, Shi, Changxia, Scoti, Miriam, Barange, Deepak K, Gowda, Ravikumar R, Chen, Eugene Y-X
Format: Article
Language:English
Subjects:
Carbonyl compounds
Carbonyls
Monomers
Polyhydroxyalkanoates
Polyhydroxyalkanoic acid
Polymers
Science & Technology - Other Topics
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cited_by cdi_FETCH-LOGICAL-c352t-eb9141eadaf6fcf4dd0aa1e60c17e1bd043720df76e5e57b0bd062a227beecdb3
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container_issue 6640
container_start_page 64
container_title Science (American Association for the Advancement of Science)
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creator Zhou, Li
Zhang, Zhen
Shi, Changxia
Scoti, Miriam
Barange, Deepak K
Gowda, Ravikumar R
Chen, Eugene Y-X
description Polyhydroxyalkanoates (PHAs) have attracted increasing interest as sustainable plastics because of their biorenewability and biodegradability in the ambient environment. However, current semicrystalline PHAs face three long-standing challenges to broad commercial implementation and application: lack of melt processability, mechanical brittleness, and unrealized recyclability, the last of which is essential for achieving a circular plastics economy. Here we report a synthetic PHA platform that addresses the origin of thermal instability by eliminating α-hydrogens in the PHA repeat units and thus precluding facile cis-elimination during thermal degradation. This simple α,α-disubstitution in PHAs enhances the thermal stability so substantially that the PHAs become melt-processable. Synergistically, this structural modification also endows the PHAs with the mechanical toughness, intrinsic crystallinity, and closed-loop chemical recyclability.
doi_str_mv 10.1126/science.adg4520
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source American Association for the Advancement of Science; Alma/SFX Local Collection
subjects Carbonyl compounds
Carbonyls
Monomers
Polyhydroxyalkanoates
Polyhydroxyalkanoic acid
Polymers
Science & Technology - Other Topics
title Chemically circular, mechanically tough, and melt-processable polyhydroxyalkanoates
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