Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 11, Pages 8263-8273Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am501077e
Keywords
Pickering emulsion; starch nanocrystals; nanocomposite
Funding
- PHC Utique program of the French Ministry of Foreign Affairs
- Ministry of higher education and research
- Tunisian Ministry of higher education and scientific research in the CMCU project [15G1115]
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Latex/starch nanocrystal (SNC) nanocomposite dispersions were successfully synthesized via a one-step surfactant-free Pickering emulsion polymerization route using SNC as the sole stabilizer. The effect of the SNC content, initiator type and comonomer on the particle size, colloidal stability, and film properties were investigated. Both HCl and H2SO4-hydrolysed starch nanocrystals, each bearing different surface charges, were used as Pickering emulsion stabilizing nanoparticles. SNCs from HCl hydrolysis were found to provide a better stabilization effect, giving rise to a polymer dispersion with a lower average particle size. The mechanistic aspects of the Pickering emulsion polymerization were also discussed. Nanocomposites formed by film-casting the polymer Pickering emulsions showed better mechanical properties and optical transparency than those obtained by blending the polymer emulsion with a nanocrystal dispersion, showing the one-pot route to nanocomposite precursors to be doubly advantageous. Therefore, this in situ polymerization technique not only facilitates the use of SNC nanoparticles, it also provides a valuable nanocomposite with enhanced mechanical properties and high transparency level.
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