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

被引：17

作者：

Bonetti, Simone ^{[1
]}

Farina, Matteo ^{[1
]}

Mauri, Michele ^{[1
]}

Koynov, Kaloian ^{[2
]}

Butt, Hans-Juergen ^{[2
]}

Kappl, Michael ^{[2
]}

Simonutti, Roberto ^{[1
]}

机构：

[1] Univ Milano Bicocca, Dept Mat Sci, Via R Cozzi 55, I-20125 Milan, Italy

[2] Max Planck Inst Polymer Res, Ackermannweg 10, D-55128 Mainz, Germany

来源：

MACROMOLECULAR RAPID COMMUNICATIONS | 2016年 / 37卷 / 07期

关键词：

atomic force microscopy; baroplasticity; nanoparticles; NMR; sealing agents; MINIEMULSION POLYMERIZATION; EMULSION POLYMERIZATION; PARTICLE MORPHOLOGY; MICROEMULSIONS; SILICA; REGION; LIGHT; C-13; NMR;

D O I：

10.1002/marc.201500625

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

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 H-1-NMR and C-13 magic angle spinning (MAS) NMR analysis suggest strong phase separation. Line width of C-13 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.

引用

页码：584 / 589

页数：6

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