自愈合发光聚氨酯弹性体的制备与性能

Preparation and Properties of Self-healing Luminescent Polyurethane Elastomer

聚氨酯材料具有优异的力学性能,而发光自愈合聚氨酯在裂缝自诊断和修复等领域具有广阔的应用前景。本文将双(2-羟乙基)二硫化物(HEDS)和1-(4-羟基苯基)-1,2,2-三苯乙烯(TPE-OH)通过化学键键接到聚氨酯体系中,制备了一种具有光致发光性质的自愈合聚氨酯(PUDS),采用傅里叶红外光谱对其化学结构进行了表征,通过X射线衍射仪、万能拉力试验机、荧光分光光度计等方法详细研究了材料的聚集态结构、力学性质、自愈合性能以及光致发光性质。实验结果表明,PUDS具有优异的光致发光性质,其自愈合性能及力学性能与动态二硫键及硬段含量有关。随着动态二硫键含量的增加,材料的自愈合性能逐渐增强,但力学性能逐渐减弱;随着硬段含量的增加,其自愈合性能逐渐减弱,但力学性能逐渐增强。因此,PUDS的力学性能和自愈合性能可通过改变动态二硫键及硬段的含量来调节。在工作中,动态二硫键含量为6.9%(wt)时,样品具有最佳的自愈合性能、力学性能以及光致发光性质。

Polyurethane materials have excellent mechanical properties,and luminescent self-healing polyurethanes have promising applications in areas such as crack self-diagnosis and repair.In this paper,a self-healing polyurethane(PUDS)with photoluminescent property was prepared by bonding bis(2-hydroxyethyl)disulfide(HEDS)and 1-(4-hydroxyphenyl)-1,2,2-tristyrene(TPE-OH)to a polyurethane system through chemical bonding,and its chemical structure was characterized by Fourier infrared spectroscopy.The aggregated structure,mechanical properties,self-healing properties and photoluminescence properties of PUDS were investigated in detail by X-ray diffraction,universal tensile tester,fluorescence spectrophotometer and other methods.The experimental results show that PUDS has excellent photoluminescence property,and its self-healing property and mechanical property are related to the dynamic disulfide bonding and hard segment content.With the increase of dynamic disulfide bonding,the self-healing property of materials gradually increases,but the mechanical property gradually decreases.With the increase of hard segment content,the self-healing property gradually decreases,but the mechanical property gradually increases.Therefore,the mechanical property and self-healing property of PUDS can be adjusted by changing the content of dynamic disulfide bonding and hard segment.In the work,the best self-healing property,mechanical property and photoluminescence property of the samples were obtained at 6.9%(wt)of dynamic disulfide bonding.