Development of multifunctional polymer nanoparticles loaded with sunscreen ingredient and fragrance, for potential textile application

Abstract:

The current work presents a study on the synthesis of multifunctional polymer nanoparticles loaded with sunscreen agents and fragrance, produced by emulsion polymerization via pickering emulsion, stabilized with inorganic colloidal particles and functional comonomers. The multifunctional nanoparticles properties were evaluated regarding the formulation aspects, with special emphasis to the UV radiation absorption properties, using a UV spectrophotometer. Silicon dioxide (SiO2) and titanium dioxide (TiO2) aqueous colloidal suspensions, with mean particle diameters of 20 nm and 25 nm, respectively, were used to stabilize the emulsion during synthesis. The high refractive index of TiO2, of about 2,6, may act as a physical UV filter. Two different monomers were used: methyl methacrylate (MMA) and styrene (Sty), together with two different functional comonomers, sodium styrene sulphonate (StySO3Na) and hydroxyethyl methacrylate (HEMA) which enhance the system’s stability. In this sudy, two different pairs of sunscreen agents were evaluated as filling materials: homosalate (HMS) + avobenzone (AVB), and octylmethoxycinnamate (OMC) + 3-benzophenone (3BP). The fragrance “SoftNeo II” (SNII, Symrise) was also used as an active ingredient, together with the sunscreen agents, for the nanocapsules. All polymer synthesis were initiated with addition of sodium persulphate and were carried at 70 °C for 4 hours. The experiments are described in Table 1, and were characterized regarding particle sizes, zeta potential, morphology and UV-vis absorption. The results are shown in Table 2 and Figures 1, 2 and 3. The nanocapsules produced had mean particle sizes of about 100 nm, and zeta potential for the suspensions nearly -30 mV, indicating good suspension stability. The SEM analysis (Figures 1 & 2) showed spherical particles with rough surface, indicating the presence of colloidal oxide particles on their surface, as expected for the pickering emulsion stabilizing mechanism. UV-vis spectrophonomery analysis showed high radiation absorption in the ultraviolet region, specially around 200 to 330 nm, and minimum aosrption through the visible spectrum. The fragrance could be detected by sensorial analysis even after synthesis, showing no degradation or chemical modification of this fragrace compounds. The multifunctional nanoparticles synthesized in this work could have several uses of technological interest, such asa special coating agents for multifunctional, high comfort, protective textiles with sun blocking properties as well as controlled release of frangrance.


Reference:
OLIVEIRA, Adriano Marim de; Gavioli, Renato Rosafa ; Cerize, Natália Neto Pereira ; CASTRO, Jordana Rodrigues de ; Nadal, Rosana Rodrigues de Almeida ; Gois, Romário de Souza . Development of multifunctional polymer nanoparticles loaded with sunscreen ingredient and fragrance, for potential textile application. In: NANOTECH CONFERENCE AND EXPO 18., 2015, Washington. Proceedings… 3 p.

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