Understanding molecular interactions to enhance deposition of perfume microcapsules on fabric surfaces

[摘要] The fundamental purpose of this Thesis is to enhance the delivery of perfume microcapsules (PMC) containing fragrance active molecules to solid fabric surfaces in laundry process. This has been done through the study and screening of different polymers such as polyvinyl formamide, chitosan and polydopamine as surface coating and bridging molecules between PMC and fabric surfaces, and the fundamental understanding of their molecular interactions in different laundry conditions. The adhesive behaviours of polymer modified microcapsules on artificial and natural fabric surfaces were studied using AFM and a flow chamber technique. The surface compositions of both microcapsules and fabric surfaces before and after the modification were characterised using standard techniques including XPS, ESEM, light microscope, contact angle and zeta potential. The mechanical strength of the microcapsules was determined using a micromanipulation technique. The relationships between the surface properties of the microcapsules before and after the modification and their mechanical strength and adhesive performances at end-use applications have been established. Although the interactions of laundry liquid parameters such as surfactant type and concentration, hardness / salt concentration were proved to have significant influences, the adhesion of PMCs to model cellulose film has been demonstrated to be influenced largely by electrostatic interactions between the film and PMC surfaces, whilst the adhesion of PMCs to model PET film was dominated by hydrophobic interactions.

[发布机构] University:University of Birmingham;Department:School of Chemical Engineering

[关键词] T Technology;TP Chemical technology