Synthesis of Grafting Itaconic Acid to Starch-Based Wood Adhesive for Curing at Room Temperature
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REVIEW
Synthesis of Grafting Itaconic Acid to Starch‑Based Wood Adhesive for Curing at Room Temperature Yanhua Zhang1 · Ziyi Guo1 · Xiaojian Chen1 · Yongming Ma1 · Haiyan Tan1 Accepted: 30 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract A new biodegradable, renewable, and environmentally friendly starch-based wood adhesive that can be used at room temperature was synthesized by grafting of itaconic acid (IA) monomer onto cassava starch. When the addition of IA was 5% (starch basis), we can obtain the optimal mechanical properties of 15.38 MPa in dry state and 4.56 MPa in wet state. Compared with unmodified starch adhesive, the shear strength of grafted starch adhesive improved by 43.6% in dry state and 93.2% in wet state, respectively. The improved performance of the grafted starch-based wood adhesive was characterized by the measurement of viscosity and solid content, Fourier-transform infrared (FTIR), Thermogravimetry (TGA), X-ray diffraction (XRD) and scanning electron microscopy analyses (SEM). The results showed that there was a new characteristic peak of ester at 1700 cm−1 in the infrared spectrogram, which indicated the successful grafting of IA onto starch. After grafting modification, the storage stability and thermal stability of starch adhesive were improved. From SEM images and XRD patterns, we can witness that the morphology and crystallinity of starch particles were changed, which as a supplement of FTIR, confirmed the improvement of bonding strength and water resistance of the adhesive.
* Haiyan Tan [email protected]; [email protected] 1
Key Laboratory of Bio‑Based Material Science and Technology, College of Material Science and Engineering, Ministry of Education, Northeast Forestry University, Harbin 150040, People’s Republic of China
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Vol.:(0123456789)
Journal of Polymers and the Environment
Graphic Abstract
Keywords Grafting · Itaconic acid · Cassava starch · Wood adhesive
Introduction In recent years, to make up the lack of petroleum, natural gas, and other non-renewable resources and increasing environmental concern, some bio-based polymers, such as lignin derivatives, starch, soybean protein and tannin into adhesives have received strong interests [1–4]. These natural resources have their unique advantages and properties. Starch is one of the most abundant natural, renewable, and biodegradable polymers, which makes it an attractive alternative for synthetic polymers [5, 6]. It has been used as binders, sizing materials, glues, and pastes in a wide range of products. However, its poor adhesive properties and water resistance limit its application in wood bonding [7]. To solve these problems, many physical or chemical modifications
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of starch molecules have been considered, such as oxidation, grafting, crosslinking, esterification, and other complex modification [8–11]. As one of the best methods, the graft copolymerization could be carried out at room temperature for modification of starch-based wood adhesive. There have bee
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