New microcapsules based on isosorbide for cosmetotextile: Preparation and characterization

Abstract

The preparation of polyurethane bio-based microcapsules containing the neroline fragrance aimed at cosmetotextile applications was investigated. The polyurethane shell material was synthesized by interfacial polycondensation using isosorbide and hexane diisocyanate as monomers.Chemical characterization by means of IR-ATR and TGA confirmed the formation of a polyurethane wall and the fragrance encapsulation up to 73% of the dry microcapsules. The physicochemical characterization of neroline-loaded microcapsules was carried out, including thermal properties, size distribution, morphology and zeta potential. The spherical microcapsules of size ranging between 2 μm and 100 μm had a rough external surface. Their thermal stability up to 260 °C was favorable regarding their application to deposition onto textile fibers. According to their IsoElectrical Point of 5.38, these microparticles were anionic at neutral pH. An isosorbide-based cationic surfactant has been adsorbed at the surface of the microcapsules for charge reversal into cationic and stronger binding to negatively charged cotton fabric.Besides, neroline-loaded microcapsules were fixed on pure cotton fabric by an impregnation technique. The reality and durability of the textile treatment were assessed by SEM and Gas Chromatography analysis. The cotton knitted fabric treated with fragrant microcapsules progressively released its microcapsule content; significant amount of residual neroline remained until 40 washing cycles.