期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 49, 页码 59527-59537出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c18401
关键词
plant protein; wood adhesive; tannic acid; adhesive hydrogel; Mussel-inspired
资金
- Fundamental Research Funds for the Central Universities [2021JD05]
- National Natural Science Foundation of China [32171699, C1603]
- Fundamental Research Funds of CAF [CAFYBB2020QC002]
In this study, a dynamically cross-linked soy protein adhesive with excellent fluidity and cold-pressing adhesion was developed based on the polyphenol-metal ion redox-induced gelation system. The adhesive exhibited outstanding bonding strength and mildew resistance, offering a potential alternative to aldehyde-based adhesives.
Soy protein (SP) adhesives can resolve several problems with aldehyde-based adhesives, including formaldehyde release and excessive dependence on petroleum-based materials. Nevertheless, their development is hindered by the lack of balance between fluidity and high cold-pressing adhesive strength. A dynamically cross-linked SP adhesive with excellent fluidity and cold-pressing adhesion was developed in this study based on the polyphenol-metal ion redox-induced gelation system. SP was blended with acrylamide (AM), ammonium persulfate (APS), and the tannic acid (TA)-Fe3+ complex to prepare an adhesive gel precursor with good fluidity. In situ gelation of SP adhesive was then achieved via AM polymerization, as initiated by redox between TA and Fe3+. As expected, the prepared adhesive gel exhibited outstanding cold-pressing bonding strength (650 kPa) to the veneers compared to the neat SP adhesive, which has almost no cold-pressing bonding strength to the veneers. The TA-Fe3+ complex induced an in situ gelation system, which endowed the SP adhesive with strong cohesion; the topological entanglement of the adhesive gel in the veneers contributed to tight interfacial combinations. The TA-Fe3+ complex served not only as an accelerator of SP adhesive gelation but also as a cross-linking core for the cross-link SP adhesive system. The prepared SP-based adhesive also exhibited outstanding hot-pressing bonding strength and mildew resistance. The proposed polyphenol-metal ion-induced in situ gelation strategy may provide a new approach for developing advanced vegetable protein adhesives to replace aldehyde adhesives.
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