Factors affecting the synthesis of microcapsules containing polyisocyanate with interfacial polymerization in water-in-oil microemulsion
Subject Areas :
Amir reza Ahadzadeh
1
(Department of Chemical Engineering, Imam Hussein Comprehensive University, Tehran, Iran)
Ali Kebritchi
2
(Department of Chemical Engineering, Imam Hussein Comprehensive University, Tehran, Iran)
Keywords: Self-healing, Microencapsulation, Isocyanate, Interfacial Polymerization, Pot-Life,
Abstract :
Microcapsules containing polyisocyanates such as TDI and IPDI have been considered for a variety of applications such as self-healing materials and coatings, prepare foams, composites, single-component adhesives, and most recently curing of polyurethane binder system. Interfacial polymerization in water-in-oil microemulsion is a quick and Inexpensive method for microencapsulation of polyisocyanates. In this paper, the effect of factors affecting the synthesis and properties of polyisocyanate microcapsules, include solubility of active hydrogen source in the oil phase to the water phase, type of monomer used, surfactant, solvent, synthesis temperature, stirring speed and emulsification time, on thickness, hardness, permeability and growth rate of the shell, as well as diameter, core fraction and particle size dispersion of microcapsules and reaction time have been investigated. The use of microcapsules containing polyisocyanate in various applications requires the satisfying of functional requirements. By controlling the factors affecting the process, microcapsules with the desired properties can be prepared.