A Self-Healing Material Based on Microcapsules of Poly(Urea-Formaldehyde)/Bis-Propargyl-Succinate Containing in Polyurethane Matrix

Authors : Thi Sinh VO, Tran Thi Bich Chau VO, Nhan Duy PHAM, Thi Ngoc Huyen LAI

Pages : 787-802

Doi:10.18596/jotcsa.934775

View : 15 | Download : 10

Publication Date : 2021-08-31

Article Type : Research Paper

Abstract :With the development of current technology, several concepts of self-healing materials insert ignore into journalissuearticles values(SHMs); have recently been proposed, and capsule-based SHMs are explored. In our study, a terminal alkyne compound insert ignore into journalissuearticles values(bis-propargyl-succinate, BPS); is concerned as a healing agent to be used as a core material, and polyinsert ignore into journalissuearticles values(urea-formaldehyde); insert ignore into journalissuearticles values(PUF); is employed as a wall shell. Besides, the chemical, morphological and thermal properties of the microcapsules insert ignore into journalissuearticles values(MCs); are also determined by Fourier-transform infrared spectroscopy insert ignore into journalissuearticles values(FTIR);, gas chromatography insert ignore into journalissuearticles values(GC);, thermogravimetric analysis insert ignore into journalissuearticles values(TGA);, and optical microscopy insert ignore into journalissuearticles values(OM);. Additionally, the MCs have better thermal stability up to 257 °C with the rough outer surface. The MCs have successfully encapsulated 75.0% of BPS with a size range of 63 – 125 μm and PUF shell thickness range of 5.72 – 11.35 μm; moreover, the stability of MCs is well maintained within 50 days at room temperature basing on the solvent extraction method. Concomitantly, self-healing ability is activated by the breakup of the MCs as cracks, then the healing agent insert ignore into journalissuearticles values(BPS); is released into the cracked regions to react with azide groups of the polymeric matrix. The BPS in the MCs is moved to cracked regions, which involves MCs diameter and weight fraction of PUF capsules. Moreover, the self-healing ability can reach high when BPS amounts insert ignore into journalissuearticles values(i.e., SHMs containing 5% and 10% of MCs); are available sufficiently to be outrightly filled into the cracked regions. Thereby, MCs` size and weight fraction can be reasonably selected to result in an optimal healing capacity for a pre-established size of cracks.
Keywords : Microcapsules, Healing agent, Urea formaldehyde, Self healing materials