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

Abstract

With the development of current technology, several concepts of self-healing materials (SHMs) have recently been proposed, and capsule-based SHMs are explored. In our study, a terminal alkyne compound (bis-propargyl-succinate, BPS) is concerned as a healing agent to be used as a core material, and poly(urea-formaldehyde) (PUF) is employed as a wall shell. Besides, the chemical, morphological and thermal properties of the microcapsules (MCs) are also determined by Fouriertransform infrared spectroscopy (FTIR), gas chromatography (GC), thermogravimetric analysis (TGA), and optical microscopy (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 (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 (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 preestablished size of cracks.

Characterization of Paper-Like Material Prepared from Chitosan/Graphene Oxide Composite

“…Polymeric systems, as is well known, have been widely used in various research fields and practical applications (1)(2)(3)(4)(5). At same time, the most remarkable factors of a polymeric material were almost entirely physical, chemical, and interface properties.…”

“…(11). Basically, CTS is an extensively classified linear copolymer in natural material sources, especially in de-acetylation of chitin, which has become a potential candidate to be applied in lots of different research fields (3,(12)(13)(14).…”

Progresses and expansions of chitosan-graphene oxide hybrid networks utilizing as adsorbents and their organic dye removal performances: A short review

“…So far, material system was extensively applied in different research fields and practical applications (4,6,(10)(11)(12), at same time that remarkable factors of a material-based adsorbent almost regard to possible physical, chemical and interface properties. So, it is necessary to conduct considerably synthetic methods that can obtain better desired results corresponding to multiple researches.…”