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

Ellingford, Christopher and Samantaray, Paresh Kumar and Farris, Stefano and McNally, Tony and Tan, Bowen and Sun, Zhaoyang and Huang, Weijie and 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). Art. No. 51617. ISSN 0021-8995. doi:10.1002/app.51617.

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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°C), 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 (cm3 mm)/(m2 24 h atm), and the water vapor 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°C are preferable for high temperature or hot food packaging.

Item Type:Article
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URLURL TypeDescription
Ellingford, Christopher0000-0002-7162-9143
Samantaray, Paresh Kumar0000-0003-2533-929X
McNally, Tony0000-0001-5436-4211
Wan, Chaoying0000-0002-1079-5885
Additional Information:© 2021 Wiley Periodicals LLC. Issue Online: 01 November 2021; Version of Record online: 04 September 2021; Manuscript accepted: 24 August 2021; Manuscript revised: 20 August 2021; Manuscript received: 14 June 2021. Christopher Ellingford and Paresh Kumar Samantaray contributed equally to this work. Funding information: Industry funding, Grant/Award Number: pujing
Funding AgencyGrant Number
Pujing Chemical CompanyUNSPECIFIED
Subject Keywords:biodegradable; structure–property relationships; thermoplastics
Issue or Number:6
Record Number:CaltechAUTHORS:20210917-183338747
Persistent URL:
Official Citation:Ellingford, C., Samantaray, P. K., Farris, S., McNally, T., Tan, B., Sun, Z., Huang, W., Ji, Y., Wan, C., J. Appl. Polym. Sci. 2022, 139(6), e51617.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:110935
Deposited By: George Porter
Deposited On:17 Sep 2021 19:47
Last Modified:02 Nov 2021 21:32

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