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Li C, Hou D, Lei H, Xi X, Du G, Zhang H, Cao M, Tondi G. Effective and eco-friendly safe self-antimildew strategy to simultaneously improve the water resistance and bonding strength of starch-based adhesive. Int J Biol Macromol 2023; 248:125889. [PMID: 37479199 DOI: 10.1016/j.ijbiomac.2023.125889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 07/07/2023] [Accepted: 07/17/2023] [Indexed: 07/23/2023]
Abstract
Starch adhesive, as a sustainable biomass-based adhesive, could be used to solve environmental problems from petroleum-derived adhesive. But its application is hindered by poor water resistance, mildew resistance, and storage stability. Here, a fully bio-based citric acid-starch adhesive (CASt) with high properties was successfully introduced by a simple method. Liquid chromatography/mass spectrometry (LC-MS), and Fourier Transform Infrared spectroscopy (FT-IR) determined that esterification of citric acid (CA) and starch (St) occurred to form a stable three-dimensional crosslinking structure, which strengthened water resistance and bonding strength of the starch adhesive. Compared with native starch (100 %), the soluble content of cured CASt was 1-16 %. CASt adhesive has well storage stability and high mildew resistance. Even after being stored for 5 months, the CASt-1 adhesive (mass ratio of CA/St = 1:1, and reaction time = 1 h) still have good liquidity. And its hot water strength (1.05 ± 0.22 MPa) also satisfied the standard requirements (≥0.7 MPa). The exhibited CASt adhesive is eco-friendly with components from plant resources, which performed as a bright alternative that can substitute petroleum-based adhesives in the artificial board industry.
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Affiliation(s)
- Chunyin Li
- College of Chemistry and Material Engineering, Zhejiang A&F University, Hangzhou 311300, China; College of Material Science and Engineering, Southwest Forestry University, Kunming 650224, China
| | - Defa Hou
- College of Material Science and Engineering, Southwest Forestry University, Kunming 650224, China.
| | - Hong Lei
- College of Chemistry and Material Engineering, Zhejiang A&F University, Hangzhou 311300, China; College of Material Science and Engineering, Southwest Forestry University, Kunming 650224, China.
| | - Xuedong Xi
- College of Material Science and Engineering, Southwest Forestry University, Kunming 650224, China
| | - Guanben Du
- College of Material Science and Engineering, Southwest Forestry University, Kunming 650224, China
| | - Hong Zhang
- Institute of Highland Forest Science, Chinese Academy of Forestry, Kunming 650224, China
| | - Ming Cao
- College of Material Science and Engineering, Southwest Forestry University, Kunming 650224, China
| | - Gianluca Tondi
- University of Padova, Department of Land, Environment, Agriculture and Forestry, Viale dell'Universita 16, 35020 Legnaro, PD, Italy
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Yuan J, Du G, Yang H, Liu S, Wu Y, Ni K, Ran X, Gao W, Yang L, Li J. Functionalization of cellulose with amine group and cross-linked with branched epoxy to construct high-performance wood adhesive. Int J Biol Macromol 2022; 222:2719-2728. [DOI: 10.1016/j.ijbiomac.2022.10.053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2022] [Revised: 10/04/2022] [Accepted: 10/06/2022] [Indexed: 11/05/2022]
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Preparation of glycidyl methacrylate grafted starch adhesive to apply in high-performance and environment-friendly plywood. Int J Biol Macromol 2022; 194:954-961. [PMID: 34848236 DOI: 10.1016/j.ijbiomac.2021.11.152] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 11/11/2021] [Accepted: 11/22/2021] [Indexed: 01/23/2023]
Abstract
In this paper, cassava starch was used as the main raw material to prepare high performance and environment-friendly starch-based adhesive. Starch was grafted with glycidyl methacrylate (GMA), and then cross-linked with sodium trimetaphosphate (STMP). Before preparation of plywood, polyaryl polymethylene isocyanate (PAPI) was mixed as chain extension agent. Prepared starch adhesives are used in wood-based panel applications. From the Fourier transform infrared (FTIR) analysis, it was found that GMA was successfully grafted to the starch adhesives which improved the hydrophobicity and shear strength of the adhesive. The plywood using modified starch adhesive at pH 4.50-5.50 showed the highest wet shear strength, 1.00 MPa, which was 163% higher than that using unmodified starch adhesive. The Scanning electron microscopy (SEM) results showed that the original morphology of starch particles were destroyed and became smaller during GMA grafting, which made the modified starch-based adhesive easier to penetrate into the bonding interface of plywood. The characterization results of the adhesive film also showed that the mechanical properties of the adhesive were better when the grafting reaction pH was 4.50-5.50. Graft copolymerization modification of starch improves the hydrophobic properties of starch binders.
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