4.7 Article

Bioinspired mineraleorganic hybridization strategy to produce a green high performance soybean meal based adhesive

Journal

JOURNAL OF CLEANER PRODUCTION
Volume 299, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2021.126939

Keywords

Bioinspired; Soybean meal; Hydroxyapatite; Tannic acid; High performance

Funding

  1. China Postdoctoral Science Foundation [2020M680406]
  2. Nation Key Research and Development Program of China [2017YFD0601205]
  3. Special Fund for Young Talents in Henan Agricultural University [30500928]
  4. National Natural Science Foundation of China [31722011]
  5. Beijing Forestry University Outstanding Young Talent Cultivation Project [2019JQ03004]

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This study used hydroxyapatite and tannic acid complex as rigid nanofiller and cross-linker to improve the properties of soybean meal adhesives, including increased wet shear strength, enhanced toughness, reduced moisture absorption, and improved residual ratio.
Soybean meal-based adhesives have been applied in many fields due to the abundant source and ecofriendly property. However, the preparation of high-performance soybean meal-based adhesives was still challenging. Inspired by the mineral-organic hybridization structure of nacre, hydroxyapatite and tannic acid complex was used as rigid nanofiller and cross-linker to improve the properties of soybean meal adhesives. Tannic acid was bonded with hydroxyapatite through coordination bonds and could promote the hydrogen bond between soybean meal and hydroxyapatite. Owing to enhanced crosslinking density, the wet shear strength of the adhesive increased from 0.66 to 1.70 MPa and the toughness was also clearly improved. The residual ratio increased to 85.8% and the moisture absorption reduced to 16.5%, indicating better water resistance. The high chemical reactivity of catechol and pyrogallol groups on tannic acid endowed the adhesive with better mildew resistance and antibacterial ability. Besides, the addition of hydroxyapatite and tannic acid complex could restrict the heat transfer and quench the oxygen free radicals, which enhanced the flame resistance of the adhesives. This study provided a new strategy for the preparation of green soybean meal-based adhesives with high performance. (c) 2021 Elsevier Ltd. All rights reserved.

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