Schiff base crosslinked poly(γ-glutamic acid) composite films with high mechanical strength and remoldability

Yao, Ying; Hsu, Yu I.; Uyama, Hiroshi

Polymer Degradation and Stability, 2025, 240, 111450

Number of Access:47（2025-10-16 16:29 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/102606

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Title
Schiff base crosslinked poly(γ-glutamic acid) composite films with high mechanical strength and remoldability
Creator
CreatorName
Yao, Ying
NRID
1000010757678 1000010757678
ORCID
0000-0002-4533-7200 0000-0002-4533-7200
researchmap permalink
yuihsu yuihsu
Scopus Author ID
55389981500 55389981500
CreatorName
Hsu, Yu I.
NRID
1000070203594 1000070203594
ORCID
0000-0002-8587-2507 0000-0002-8587-2507
researchmap permalink
read0168389 read0168389
Scopus Author ID
7102108908 7102108908
CreatorName
Uyama, Hiroshi
Subject
Acylhydrazone bond
Chemical recyclability
Poly(vinyl alcohol)
Poly(γ-glutamic acid)
Sustainable packaging
Description
Yao Y., Hsu Y.I., Uyama H.. Schiff base crosslinked poly(γ-glutamic acid) composite films with high mechanical strength and remoldability. Polymer Degradation and Stability 240, 111450 (2025); https://doi.org/10.1016/j.polymdegradstab.2025.111450.
Abstract
With growing concerns over the environmental impact of traditional thermoset materials, the development of green and sustainable alternatives has emerged as a key research priority. In this study, we report a novel approach for fabricating recyclable poly(γ-glutamic acid) (γ-PGA)-based films via dynamic covalent Schiff base crosslinking. γ-PGA was first functionalized with hydrazide groups via reaction with adipic dihydrazide (P-ADH) and subsequently crosslinked with acetoacetylated poly(vinyl alcohol) (AAPVA) under mild, catalyst-free conditions to form an acylhydrazone crosslinked network, resulting in a high-performance, recyclable thermoset film. The resulting films demonstrated excellent mechanical properties (a tensile strength of 123.5 MPa and Young's modulus of 4.4 GPa), high optical transparency, UV-shielding capability, and solvent resistance. Notably, dynamic crosslinks enable acid-triggered cleavage, allowing for the recovery of macromolecular components and their reprocessing into new films, thereby demonstrating exceptional chemical recyclability and reusability. This work presents a promising strategy for enhancing the performance and sustainability of γ-PGA-based materials and highlights their potential as viable alternatives to conventional plastic thermosets.
Publisher
Elsevier Ltd
Source Title
Polymer Degradation and Stability
Volume (Issue)
240
Page
111450
Date of Issued
2025-06-05
Language
English
Handle URL
https://hdl.handle.net/11094/102606
PISSN
01413910
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.polymdegradstab.2025.111450
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article