Materials 2013, 6(9), 3727-3741; doi:10.3390/ma6093727
Article

Synthesis and Characterization of Encapsulated Nanosilica Particles with an Acrylic Copolymer by in Situ Emulsion Polymerization Using Thermoresponsive Nonionic Surfactant

1,2,†email, 2,†email, 3email, 2email, 4email and 1,5,* email
Received: 25 April 2013; in revised form: 27 May 2013 / Accepted: 6 August 2013 / Published: 28 August 2013
(This article belongs to the Section Advanced Composites)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Nanocomposites of encapsulated silica nanoparticles were prepared by in situ emulsion polymerization of acrylate monomers. The synthesized material showed good uniformity and dispersion of the inorganic components in the base polymer, which enhances the properties of the nanocomposite material. A nonionic surfactant with lower critical solution temperature (LCST) was used to encapsulate the silica nanoparticles in the acrylic copolymer matrix. This in situ method combined the surface modification and the encapsulation in a single pot, which greatly simplified the process compared with other conventional methods requiring separate processing steps. The morphology of the encapsulated nanosilica particles was investigated by dynamic light scattering (DLS) and transmission electron microscopy (TEM), which confirmed the uniform distribution of the nanoparticles without any agglomerations. A neat copolymer was also prepared as a control sample. Both the neat copolymer and the prepared nanocomposite were characterized by Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analyses (TGA), dynamic mechanical thermal analysis (DMTA) and the flame resistance test. Due to the uniform dispersion of the non-agglomerated nanoparticles in the matrix of the polymer, TGA and flame resistance test results showed remarkably improved thermal stability. Furthermore, DMTA results demonstrated an enhanced storage modulus of the nanocomposite samples compared with that of the neat copolymer, indicating its superior mechanical properties.
Keywords: silica nanoparticles; thermoresponsive nonionic surfactant; cloud point; emulsion polymerization
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MDPI and ACS Style

Yazdimamaghani, M.; Pourvala, T.; Motamedi, E.; Fathi, B.; Vashaee, D.; Tayebi, L. Synthesis and Characterization of Encapsulated Nanosilica Particles with an Acrylic Copolymer by in Situ Emulsion Polymerization Using Thermoresponsive Nonionic Surfactant. Materials 2013, 6, 3727-3741.

AMA Style

Yazdimamaghani M, Pourvala T, Motamedi E, Fathi B, Vashaee D, Tayebi L. Synthesis and Characterization of Encapsulated Nanosilica Particles with an Acrylic Copolymer by in Situ Emulsion Polymerization Using Thermoresponsive Nonionic Surfactant. Materials. 2013; 6(9):3727-3741.

Chicago/Turabian Style

Yazdimamaghani, Mostafa; Pourvala, Tannaz; Motamedi, Elaheh; Fathi, Babak; Vashaee, Daryoosh; Tayebi, Lobat. 2013. "Synthesis and Characterization of Encapsulated Nanosilica Particles with an Acrylic Copolymer by in Situ Emulsion Polymerization Using Thermoresponsive Nonionic Surfactant." Materials 6, no. 9: 3727-3741.

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