Core@shell Poly(n-butylacrylate)@polystyrene Nanoparticles: Baroplastic Force-Responsiveness in Presence of Strong Phase Separation

Macromolecular Rapid Communications
Simone BonettiRoberto Simonutti

Abstract

Poly(n-butylacrylate)@polystyrene nanoparticles behaving as a capsule-based sealing nanoadditive are synthesized through an optimized semicontinuous emulsion polymerization protocol. Solid state time-domain (1)H-NMR and (13)C magic angle spinning (MAS) NMR analysis suggest strong phase separation. Line width of (13)C resonances in cross polarization and single pulse experiment MAS-NMR spectra indicates that the peculiar mobility of each phase is preserved at the nanoscale. Atomic force spectroscopy (AFM) shows the permanence of spherical shape in absence of solvent (i.e., subsequent to strong capillary and surface forces) up to moderate external load, as well as the possibility of plastically deforming the polystyrene shell and ultimately triggering the nanoparticle flow at higher force loads. The breakdown characteristic of the nanoparticle shows for the first time baroplastic behavior on a single particle with precise biphasic core@shell morphology.

References

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Mar 9, 2005·Langmuir : the ACS Journal of Surfaces and Colloids·Sheng-Wen ZhangLi-Min Wu
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Oct 28, 2014·Macromolecular Rapid Communications·Alberto BianchiRoberto Simonutti

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Citations

Jun 21, 2018·Nanoscale·Dong Jin Kang, Sushant Anand
Jul 18, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Massimo TawfilasRoberto Simonutti

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