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Reactive extrusion of biodegradable PGA/PBAT blends to enhance flexibility and gas barrier properties

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Ellingford, Christopher, Samantaray, Paresh Kumar, Farris, Stefano, McNally, Tony, Tan, Bowen, Sun, Zhaoyang, Huang, Weijie, Ji, Yang and Wan, Chaoying (2022) Reactive extrusion of biodegradable PGA/PBAT blends to enhance flexibility and gas barrier properties. Journal of Applied Polymer Science, 139 (6). e51617. doi:10.1002/app.51617

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WRAP-reactive-extrusion-biodegradable-PGA-PBAT-blends-enhance-flexibility-gas-barrier-properties-2021.pdf - Accepted Version
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Official URL: http://dx.doi.org/10.1002/app.51617

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Abstract

Among commercial biodegradable polyesters, poly(glycolic acid) (PGA) has been rarely investigated for packaging applications, despite its unique advantages such as 100% compostability, high degree of crystallinity, high thermal stability and high gas barrier properties. The application of PGA has been limited by its mechanical brittleness, moisture sensitivity, and high melting temperature (~240 oC), restricting its processing and applications for film packaging. In this study, PGA was modified by blending with poly (butylene adipate-co-terephthalate) (PBAT) via melt-extrusion. A commercial terpolymer of ethylene, acrylic ester and glycidyl methacrylate (EMA-GMA) was selected for compatibilization. The phase morphology, rheology, thermal, mechanical and gas barrier properties of the blends were investigated. With addition of 20 wt. % EMA-GMA, the elongation of PGA/PBAT (50/50 wt. %) blends was improved from 10.7 to 145%, the oxygen permeability was reduced from 125 to 103 (cm3mm) / (m224h atm), and the water vapour barrier performance was improved by ~47%. The enhancement in ductility, oxygen and water vapor barrier properties of the flexible blends were ascribed to the interfacial bonding between PBAT and PGA enabled by EMA-GMA. The compatibilized PGA/PBAT blends with high thermal stability up to 300 oC are preferable for high temperature or hot food packaging.

Item Type: Journal Article
Subjects: T Technology > TP Chemical technology
T Technology > TS Manufactures
Divisions: Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Biodegradable plastics, Polyesters, Plastics in packaging, Flexure, Melt spinning
Journal or Publication Title: Journal of Applied Polymer Science
Publisher: John Wiley & Sons, Inc.
ISSN: 0021-8995
Official Date: 10 February 2022
Dates:
DateEvent
10 February 2022Published
4 September 2021Available
30 August 2021Accepted
Volume: 139
Number: 6
Article Number: e51617
DOI: 10.1002/app.51617
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): This is the peer reviewed version of the following article: Ellingford, C., Samantaray, P. K., Farris, S., McNally, T., Tan, B., Sun, Z., Huang, W., Ji, Y., Wan, C., J. Appl. Polym. Sci. 2021, e51617. https://doi.org/10.1002/app.51617. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDPujing Chemical Industry Co. LtdUNSPECIFIED

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