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Journal of Polymer Research

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01-10-2023 | Original Paper

Effect of chain extender on the morphological, rheological and mechanical properties of biodegradable blends from PBAT and P34HB

Authors: Junhao Li, Hongda Cheng, Yi Li, Huan Wang, Hongliang Hu, Jiaxin Liu

Published in: Journal of Polymer Research | Issue 10/2023

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Abstract

The inherent shortcomings of fully biodegradable poly(butylene adipate-co-terephthalate) (PBAT) copolyesters including low strength, modulus, and melt viscoelasticity were addressed by melt blending of PBAT with high-stiffness and biological poly(3-hydroxybutyrate-co-4-hydroxybutyrate) (P34HB). An epoxy-based chain extender was used to increase interfacial adhesion of partially miscible PBAT/P34HB (70wt/30wt) blends. The addition of chain extender refined phase-separated morphology of blends from SEM and decreased the degree of crystallinity by DSC. Compared with neat PBAT, PBAT/P34HB blends with chain extender showed much higher melt viscosity and elasticity, as indicated by rheological properties analyses. Compared with the PBAT/P34HB blend without chain extender, the breaking strength and elongation at break of PBAT/P34HB blend with incorporation of 1 wt% ADR were increased by 91.8% and 58.7%, respectively. It could be concluded that the combination of blending and chain-extension reaction simultaneously improved the strength, elongation at break, and melt viscoelasticity, which contributed to the suitability of biodegradable polymer blends for a wider range of end-use applications.

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Title: Effect of chain extender on the morphological, rheological and mechanical properties of biodegradable blends from PBAT and P34HB
Authors: Junhao Li
Hongda Cheng
Yi Li
Huan Wang
Hongliang Hu
Jiaxin Liu
Publication date: 01-10-2023
Publisher: Springer Netherlands
Published in: Journal of Polymer Research / Issue 10/2023
Print ISSN: 1022-9760
Electronic ISSN: 1572-8935
DOI: https://doi.org/10.1007/s10965-023-03775-7

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