Design and fabrication of colloidal polymer nanocomposites

Wang, Tao; Keddie, Joseph L.

doi:10.1016/j.cis.2008.06.002

Cited by 86 publications

(70 citation statements)

References 147 publications

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“…In the central regions of the particles, there is energy dissipation from the underlying PLA, and hence the clay discs are not well resolved. 28 , 29 The Laponite platelets will not be randomly arranged in three dimensions. Figures 2A and C show schematically the three-dimensional honeycomb structure that will be created.…”

Section: Resultsmentioning

confidence: 99%

Soft polymer and nano-clay supracolloidal particles in adhesives: synergistic effects on mechanical properties

et al. 2009

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Numerous synthesis routes towards nanostructured polymer particles have emerged, but few examples demonstrate the essential need for such complex particle structures to achieve any added benefit in a target application. Here, polymer particles having Laponite-clay armor were prepared by the Pickering miniemulsion polymerization of n-lauryl acrylate. The resulting "softhard" poly(lauryl acrylate) (PLA)/Laponite hybrid particles were blended at varying low concentrations with a standard poly(butyl acrylate-co-acrylic acid) (PBA) latex for application as a waterborne pressure-sensitive adhesive (PSA). The tack adhesion properties of the resulting nanocomposite films were compared with the performance of the PBA when blended with either a conventional non-armored PLA latex, with Laponite RD nanosized clay discs, or a mixture of both. A true synergistic effect was discovered showing that the clay-armored supracolloidal structure of the hybrid particles was essential to achieve a superior balance of viscoelastic properties. The addition of small amounts, e.g. 2.7 wt.%, of the "soft-hard" clay-armored PLA particles increased the tack adhesion energy considerably more than found for the two individual components or for the sum of their individual contributions. The soft PLA core ensures that the adhesives are not stiffened too much by the nano-sized Laponite clay. Slippage at the interface between the nanoclay platelets and the PBA matrix introduces an additional energy dissipation mechanism during deformation. Through the synergistic effect of the clay and PLA in the supracolloidal armored latex structure, the tack adhesion energy is increased by 45 Jm -2 , which is about 70% greater than found for the PBA adhesive alone. IntroductionPolymer-inorganic hybrid particles with interesting nanostructures have been fabricated via a myriad of synthetic routes to impart desirable physical characteristics, including ferromagnetism 1 , 2 , self-assembly of particle chains 3 , ionic fluid flow, 4 and enhanced mechanical properties in nanocomposites 5,6,7 . One emerging fabrication route makes use of the assembly of colloidal building blocks to construct a more complex nanocomposite supracolloidal structure. The assembly process can be driven or guided by electrostatic forces, such as in heterocoagulation to prepare silica/polymer nanocomposite nanoparticles 8 .The process can also make use of confined geometries, e.g. droplets 9 , or a "particle lithography" approach, which -when coupled with electrostatic forces -leads to patchy structures 10 . A convenient and scalable method to fabricate polymer latexes armored with inorganic nanoparticles is to employ liquid-liquid interface-driven assembly and to combine it with (mini)emulsion polymerization techniques. 11,12,13 Although there has been a recent surge in fabrication methods for submicron-sized supracolloidal structures, examples in which profound changes in the bulk material properties can be directly ascribed to the nanostructured morphology of these complex colloidal partic...

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Section: Resultsmentioning

confidence: 99%

Soft polymer and nano-clay supracolloidal particles in adhesives: synergistic effects on mechanical properties

et al. 2009

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“…There are two classes of patterned surfaces, chemically patterned surfaces and topographically patterned surfaces [49,50]. Chemically patterned surfaces usually have a lateral variation or modulation of surface properties such as electrostatic forces or charges, wettabilities, hydrophilicities, and chemical reactivity.…”

Section: Colloidal Assembly On Patterned Surfacesmentioning

confidence: 99%

Surface-anisotropic spherical colloids in geometric and field confinement

Kretzschmar

Song

2011

Current Opinion in Colloid & Interface Science

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“…An alternative very efficient method to prepare nanocomposites featuring homogeneous nanofiller dispersion consists in the use of tailored polymer particles [5]. This bottom-up strategy involves either blends of colloidal polymer particles with a second type of particles (inorganic or polymeric) or hybrid particles consisting of a polymer phase and a second phase.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of PTFE-PMMA Core-Shell Nanoparticles and Nanocomposites

Antonioli

Laus

Zuccheri

et al. 2012

Journal of Nanotechnology

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The preparation of polytetrafluoroethylene-poly(methyl methacrylate) (PTFE-PMMA) core-shell particles was described, featuring controlled size and narrow size distribution over a wide compositional range, through a seeded emulsion polymerization starting from a PTFE seed of 26 nanometers. Over the entire MMA/PTFE range, the particle size increases as the MMA/PTFE ratio increases. A very precise control over the particle size can be exerted by properly adjusting the ratio between the monomer and the PTFE seed. Particles in the 80-240 nm range can be prepared with uniformity indexes suited to build 2D and 3D colloidal crystals. These core-shell particles were employed to prepare nanocomposites with different compositions, through an annealing procedure at a temperature higher than the glass transition temperature of the shell forming polymer. A perfect dispersion of the PTFE particles within the PMMA matrix was obtained and optically transparent nanocomposites were prepared containing a very high PTFE amount.

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Design and fabrication of colloidal polymer nanocomposites

Cited by 86 publications

References 147 publications

Soft polymer and nano-clay supracolloidal particles in adhesives: synergistic effects on mechanical properties

Soft polymer and nano-clay supracolloidal particles in adhesives: synergistic effects on mechanical properties

Surface-anisotropic spherical colloids in geometric and field confinement

Preparation and Properties of PTFE-PMMA Core-Shell Nanoparticles and Nanocomposites

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