摘要
为应对传统化学黏合剂因环境污染和潜在健康风险所带来的挑战,本研究在成功制备一款天然桑蚕丝蛋白和单宁酸复合胶黏剂的同时,很好地解决了传统黏合剂在低温环境下无法工作或性能不佳等问题.通过在丝蛋白中引入与其有强相互作用的单宁酸,抑制了丝蛋白由无规卷曲构象向β-折叠构象的转变,进而保障了此复合胶黏剂的强黏附力.在优化丝蛋白与单宁酸复合物配比的基础上,选用乙二醇和水二元溶剂体系,不仅有效提升了此生物基胶黏剂溶解性能和对各种基体黏结的普适性,并且显著降低了其冻结点,赋予了其相应的抗冻性能.实验结果证实,此生物基胶黏剂在从-20℃到室温范围内均展现出超越传统商用化学黏合剂和其他生物基黏合剂的黏附能力.因此,所研发的抗冻型丝蛋白生物基胶黏剂,以其环保性、生物降解性及在低温条件下出色的黏结性能,在包装、生物医疗及环境保护等领域中具有很好的应用前景.
Amidst growing demands for environmental protection and sustainable development,there is an urgent need within the industry for alternatives to traditional chemical adhesives,which are implicated in environmental contamination and health hazards.This study introduces an antifreeze silk fibroin bioadhesive designed to address the performance deficits of conventional bio-based adhesives in frozen conditions.The synthesis of this novel silkderived adhesive employs a dual-stage process:initially crafting a silk fibroin-based adhesive matrix,followed by its integration with an aqueous solvent system to formulate the bioadhesive.This approach enables the long-term storage of protein powders under ambient conditions,with the flexibility of formulation and application upon demand.Additionally,the adhesive strength is readily adjustable through the modulation of substrate concentration.The adhesive efficacy is principally reliant on the hydrogen bonding capability,with the quantity of hydrogen bond sites provided by silk fibroin critically influencing the protein adhesive’s binding properties.Incorporation of tannic acid,known for its strong affinity with silk fibroin,prevents the transition of silk fibroin chains from a random coil to a β-sheet,thereby preserving the bioadhesive’s strength.The study further refines the silk fibroin to tannic acid ratio and solvent composition,opting for a binary solvent system of ethylene glycol and water.This choice markedly enhances the solubility of the silk fibroin bioadhesive and significantly depresses its freezing point,augmenting its antifreeze capabilities and facilitating substrate bonding at low temperatures.The adhesive also exhibits exceptional low-temperature stability and adaptability to fluctuations in ambient temperature.Experimental validations demonstrate that this bioadhesive surpasses the adhesive performance of conventional commercial chemical adhesives and other bio-based adhesives over a broad temperature range from -24℃ to room temperature.Consequently,the
作者
李欣阳
陈旎
杨公雯
邵正中
Xin-yang Li;Ni Chen;Gong-wen Yang;Zheng-zhong Shao(State Key Laboratory of Molecular Engineering of Polymers,Laboratory of Advanced Materials,Department of Macromolecular Science,Fudan University,Shanghai 200433)
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2024年第11期1463-1475,共13页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号21935002)资助项目。
