Effects of Different Denaturants on Properties and Performance of Soy Protein-Based Adhesive
| Autor: | Jianzhang Li, Zhang Meng, Zhang Yi, Qiang Gao, An Mao, Li Yue |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Polymers and Plastics
Sodium crosslinking structure technology industry and agriculture Epoxide Chemical modification chemistry.chemical_element soy protein macromolecular substances General Chemistry protein surface hydrophobic index Article lcsh:QD241-441 chemistry.chemical_compound lcsh:Organic chemistry chemistry Sulfite Chemical engineering wet shear strength Urea Adhesive hydrophobic groups Sodium dodecyl sulfate Soy protein |
| Zdroj: | Polymers Volume 11 Issue 8 Polymers, Vol 11, Iss 8, p 1262 (2019) |
| ISSN: | 2073-4360 |
| DOI: | 10.3390/polym11081262 |
| Popis: | Chemical modification of soy protein, via crosslinking, is the preferred method for creating non-toxic, renewable, environmentally friendly wood adhesives. The denaturing process of protein is important for the adhesive performance improvement. In order to investigate the effect of different denaturing agents on the performance of soy protein-based adhesives before and after crosslinking modification. In this study, three different denaturing agents&mdash urea (U), sodium dodecyl sulfate (SDS), and sodium hydrogen sulfite (SHS) and an epoxide crosslinking agent&mdash Triglycidylamine (CA) were used to prepare soy protein-based adhesives. The results showed: (1) The denaturing agent unfolded protein molecules and exposed more hydrophobic groups to prevent water intrusion, which was mainly a contribution for the water resistance and performance improvement of soy protein-based adhesives. The wet shear strength was improved up to 91.3% (denaturing by urea). (2) After modifying by the crosslinking agent, the properties and performance improvement was due to the fact that the active groups on soybean protein molecules reacted with the crosslinking agent to form a crosslinking structure, and there is no obvious correlation with the hydrophobic groups of the protein. (3) The unfolded soybean protein molecules also expose hydrophilic groups, which facilitates the reaction between the crosslinking agent and protein to form a denser crosslinking structure to improve the performance of the adhesive. Particularly, after denaturing with SHS, the wet shear strength of the plywood bonded by the SPI-SHS-CA adhesive increased by 217.24%. |
| Databáze: | OpenAIRE |
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