title: The effect of surfactant chain length on the morphology of poly(methyl methacrylate) microcapsules for fragrance oil encapsulation.
abstract: The solvent evaporation method for producing microcapsules relies upon the correct wetting conditions between the three phases involved in the synthesis to allow core-shell morphologies to form. By measuring the interfacial tensions between the oil, polymer and aqueous phases, spreading coefficients can be calculated, allowing the capsule morphology to be predicted. In this work we explore the effect of surfactant chain length on capsule morphology using poly(methyl methacrylate) as the polymer and hexadecane as the core. We compared the predicted morphologies obtained using the polymer as a solid, and the polymer dissolved in dichloromethane to represent the point at which capsule formation begins. We found that using the polymer in its final, solid form gave predictions which were more consistent with our observations. The method was applied to successfully predict the capsule morphologies obtained when commercial fragrance oils were encapsulated.
authors: Faculty of Engineering, Architecture and Information Technology, University of Queensland, St Lucia, Queensland 4072, Australia; School of Chemical and Process Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, United Kingdom. Electronic address: a.tasker@uq.edu.au.
authors: Alison Louise
authors: AL
authors: Tasker
authors: School of Chemical and Process Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, United Kingdom.
authors: James Paul
authors: JP
authors: Hitchcock
authors: School of Chemical and Process Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, United Kingdom.
authors: Ling
authors: L
authors: He
authors: Procter & Gamble, London Innovation Centre, Rusham Park, Whitehall Ln, Egham TW20 9NW, United Kingdom.
authors: Elaine Alice
authors: EA
authors: Baxter
authors: Faculty of Engineering, Architecture and Information Technology, University of Queensland, St Lucia, Queensland 4072, Australia.
authors: Simon
authors: S
authors: Biggs
authors: School of Chemical and Process Engineering, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, United Kingdom.
authors: Olivier Jean
authors: OJ
authors: Cayre
mesh_terms: D000473:Alkanes / Q000737:chemistry; D002214:Capsules; D004339:Drug Compounding; D008752:Methylene Chloride / Q000737:chemistry; D009822:Oils, Volatile / Q000737:chemistry*; D019904:Polymethyl Methacrylate / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D013500:Surface Tension; D013501:Surface-Active Agents / Q000737:chemistry*; D014835:Volatilization; D014867:Water / Q000737:chemistry; D017155:Wettability
chemical_list: D000473:Alkanes; D002214:Capsules; D009822:Oils, Volatile; D000644:Quaternary Ammonium Compounds; D013501:Surface-Active Agents; D014867:Water; D008752:Methylene Chloride; D019904:Polymethyl Methacrylate; C007932:n-hexadecane; C022806:dodecyltrimethylammonium
keywords: Encapsulation; Morphology; Polymeric microcapsules; Wetting