SbF_5-loaded microcapsules for ultrafast self-healing of polymer |
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Authors: | Xiao-Ji Ye Zhuo-Xi Ma Yi-Xi Song Jia-Jia Huang Min-Zhi Rong Ming-Qiu Zhang |
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Institution: | Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, GD HPPC Lab, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, China |
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Abstract: | To accelerate self-healing speed of epoxy materials,epoxy-SbF_5 cure was introduced into the healing chemistry.Due to the high activity of SbF_5,a milder SbF_5-ethanoI complex with improved processability was prepared,but it was still quite active and cannot be encapsulated by conventional encapsulation techniques like in situ polymerization.Accordingly,a novel route was proposed.Hollow silica microcapsules were firstly synthesized via sol-gel technique,which were then steeped in ethanol solution of SbF_5-ethanol complex under vacuum,allowing infiltration of the latter into the capsules.The optimal formulation for creating the hollow silica capsules was studied in detail.Moreover,the results of optical pyrometry demonstrated that the encapsulated chemical retained its high reactivity toward the epoxy. |
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Keywords: | Sol-gel Microencapsulation Lewis acid Self-healing |
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