Thermoresponsive latexes for fragrance encapsulation and release

• DOI: 10.1111/ics.12267
• Publication Date: 2015-07-30T14:37:05Z
• Authors: N. Popadyuk; A. Popadyuk; A. Kohut; A. Voronov
• Keywords: Miniemulsion

To synthesize cross-linked latex particles protecting the encapsulated fragrance at ambient temperatures and facilitating release of cargo temperature surface skin that varies in different regions body between 33.5 36.9°C. Poly(stearyl acrylate) (PSA), a polymer with long crystallizable alkyl side chains (undergoes order-disorder transitions 45°C), was chosen as main component particles. As result, new thermoresponsive for encapsulation were synthesized characterized, including assessing performance triggered by elevated temperature.To obtain network domains various crystallinity, stearyl acrylate copolymerized dipropylene glycol caprylate (DGAC) (comonomer) presence diacrylate sebacate (cross-linker) using miniemulsion process. Comonomers cross-linker mixed directly during polymerization. Fragrance evaluated 25, 31, 35 39°C to demonstrate material potential personal/health care skin-related applications.Particles protect from evaporation 25°C. The rate gradually increases 39°C. Two slopes found on plots. first slope corresponds rapid release. second indicates subsequent reduction rate.Crystalline-to-amorphous transition PSA triggers fragrances temperatures. fragrance, well inclusion amorphous fragments network, reduces particle crystallinity enhances Release profiles can be tuned controlled amount loaded ratio comonomers feed mixture.