Engineering Friction-Activated Biopolymer Microcapsules for Controlled Release of Lipophilic MaterialNew Submission

Friction-activated microcapsules represent a new approach to controlling lipophilic release via mechanical stimulation rather than passive diffusion. This study describes the design of sustainable microcapsules that rupture under mechanical frictional stress and work as well as conventional synthetic systems. For this research, essential oil is the core material, and poly (methyl methacrylate) (PMMA) capsules are the synthetic control. Two sustainable alternatives, hybrid acrylate-chitosan and biodegradable chitosan capsules, are used to understand how materials impact activation and release. Capsules are made using solvent evaporation, self-assembly, and ionic gelation depending on polymer type. The structural and functional performance is evaluated through microscopic imaging, rheological analysis, and frictional rupture testing to determine correlations between size, wall thickness, and activation thresholds. The study aims to identify design parameters that optimize responsiveness while reducing environmental persistence. Overall, this work contributes to the development of friction-activated, biodegradable delivery systems that combine mechanical sensitivity with sustainability while advancing development towards eco-friendly materials in personal care applications.