A Brief Review on Modification of Poly(urea-formaldehyde) Microcapsules to Improve the Performance of Self-healing Composite Systems

Document Type : compile

Authors

1 Polymer engineering group, Department of chemical engineering, Isfahan university of technology, Isfahan, Iran

2 Department of Materials and Polymer Engineering, Faculty of Engineering, Hakim Sabzevari University, Sabzevar, 9617976487, Iran

Abstract

Nowadays, the microencapsulation of materials is used extensively in different fields and industries including agriculture, food and pharmaceuticals, coatings,and cosmetics. One of the most important applications of microcapsules is preparation of self-healing polymer composites. Poly(urea-formaldehyde) (PUF) microcapsules have received a lot of attention due to their suitable properties in the preparation of these systems. However, in some cases, these microcapsules do not have the ability to interact properly with the polymer matrix. As a result, they reduce the mechanical properties of the matrix as well as prevent the proper transfer of applied stress to the microcapsules (and thus reduce self-healing performance). Modification of microcapsules in order to reinforce the interaction of the matrix-microcapsule as well as improving their properties is an effective approach to decrease the mechanical properties reduction and improve stress transfer to the microcapsules. According to the literature, the modification methods of PUF microcapsules can be classified into 4 main groups including; modification via silane coupling agents, modification during synthesis, modification by using nanoparticles, and preparation of multishell microcapsules via layer-by-layer deposition method. In this review, microcapsules and factors affecting their effectiveness, methods of encapsulation, and microcapsule based self-healing systems are explained briefly. PUF microcapsules and their modification methods are also discussed.

Keywords

Main Subjects

References

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