Characterization of polyurea microcapsules synthesized with an isocyanate of low toxicity and eco-friendly esters via microfluidics: Shape, shell thickness, morphology and encapsulation efficiency

There are some studies on the synthesis of polyurea microcapsules. However, there is hardly a case where both green solvents and non-toxic isocyanates used, especially in microfluidics. In this work, an environmentally friendly chemical system interfacial polymerization (isocyanate: HDB-LV; solvent: octyl salicylate or dibutyl adipate) tested for first time to produce The size microcapsules calibrated at 78 ?m by microfluidics quantitatively analyze relationships among shell thickness, encapsulation efficiency isocyanate concentrations. influences solvent types reactant concentrations shape, morphology thickness studied. Esters with low water miscibility amine (lower reaction rate) crucial formation spherical An ester high can diffuse into continuous phase during encapsulation, which results broken A concentration probably cause cross-linking not only interface but also inside droplet template, leads microcapsule deformation. linear relationship observed between concentration. Overall, (more than 90%) achieved