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蛋白质表面水性和表面胺基对大豆粘合强度的影响
Heikko Kallakas1, Nayomi Plaza2, Casey Crooks2
1Laboratory of Wood Technology, Department of Materials and Environmental Technology, School of Engineering, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia.
Polymers
|January 23, 2024
概括
研究用于木材粘合剂的大豆蛋白分离物显示,表面疏水性,而不是氨基群,显著影响结合强度. 适当的变性是关键,因为广泛的水解会对粘合性能产生不利影响.
科学领域:
- 材料科学 材料科学 材料科学
- 生物化学 生物化学
- 粘合剂技术 技术 粘合剂技术
背景情况:
- 豆蛋白分离物 (SPI) 是具有成本效益的,丰富的天然材料用于木材粘合剂.
- 提高SPI湿切强度对于更广泛的市场采用至关重要.
- 蛋白质变性传统上与通过表面激活增强的粘合结合有关.
研究的目的:
- 研究SPI的表面特征 (疏水性,氨基群) 和粘合性能之间的关系.
- 为了评估不同化处理对大豆蛋白粘合强度的影响.
- 为了确定聚胺烯化水素 (PAE) 作为SPI粘合剂的交联剂的有效性.
主要方法:
- 十四个SPI的特征与不同的变性化历史.
- 测量表面疏水性,表面氨基含量和蛋白质水解程度.
- 使用ASTM D7998评估湿和干结合强度,有或没有PAE交联.
主要成果:
- 在变性化过程中进行了大量的蛋白质水解,导致键强度显著降低.
- 增加的表面疏水性与粘合强度正相关,特别是对于没有PAE的湿强度.
- 可访问的氨基基群的数量没有影响粘合强度,即使在PAE交叉连接的情况下.
结论:
- 蛋白质变性化的方法极大地影响了粘合剂的结合,这与一般的假设相反.
- 暴露水的表面群增强了粘合强度,而增加的氨基群则没有.
- 作为一种变质化方法的水解对大豆蛋白粘合剂的性能有害.
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