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Effects of Copolymer Structure on Enzyme-Catalyzed Polyester Recycling

Journal Article · · Journal of Polymers and the Environment
 [1];  [2];  [2];  [2];  [2];  [2];  [2]
  1. University of Massachusetts, Lowell, MA (United States); University of Massachusetts Lowell
  2. University of Massachusetts, Lowell, MA (United States)
Polyesters are an omnipresent material used for a variety of applications (e.g., bottles, packaging, textile, windshield), roughly comprising 8% of plastics produced worldwide. Enzymatic recycling is an emerging solution to deal with the increasingly diverse polyesters that are not suitable for mechanical recycling. However, enzyme activity and efficiency are still the limiting factors impeding enzymatic recycling for different plastic waste forms. The effects of thermal and structural properties (e.g., glass transition temperature, crystallinity, specific surface area), which are determined by chemical composition and preprocessing, directly influence enzyme recycling efficiency. This work investigates two extrusion methods (single screw and twin-screw extrusion) to pretreat a range of copolyesters (RPET, PETG, Ecozen, Tritan and PBT) and modify their properties (i.e., glass transition temperature (Tg), crystallinity (%), and molecular weight (Mn)). A PET-specific enzyme, leaf-branch compost cutinase (LCCICCG), produced from a fed-batch fermentation of Escherichia coli BL21(DE3), was used for the enzymatic depolymerization of different polyesters. Several copolyesters showed improved depolymerization after pretreatment, as measured by rate and amount of monomers produced. Furthermore, those that did not depolymerize were found to have exceptionally high glass transition temperature or percent crystallinity, highlighting the importance of these physical parameters on conversion efficiency.
Research Organization:
University of Massachusetts, Lowell, MA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
EE0008930
OSTI ID:
2429414
Journal Information:
Journal of Polymers and the Environment, Journal Name: Journal of Polymers and the Environment Vol. 32; ISSN 1566-2543
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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