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Using Janus Nanoparticles To Trap Polymer Blend Morphologies during Solvent-Evaporation-Induced Demixing

Journal Article · · Macromolecules
 [1];  [2];  [3];  [1];  [1]
  1. Univ. of Massachusetts, Amherst, MA (United States)
  2. Univ. Bayreuth, Bayreuth (Germany)
  3. Univ. Bayreuth, Bayreuth (Germany); Johannes Gutenberg Univ. Mainz, Mainz (Germany)
Using ternary blends of polystyrene (PS), poly(methyl methacrylate) (PMMA), and Janus particles (JPs) with symmetric PS and PMMA hemispheres, we demonstrate the stabilization of dispersed and bicontinuous phase-separated morphologies by the interfacial adsorption of Janus particles during demixing upon solvent removal. The resulting blend morphology could be varied by changing the blend composition and JP loading. Increasing particle loading decreased the size of phase-separated domains, while altering the mixing ratio of the PS/PMMA homopolymers produced morphologies ranging from PMMA droplets in a PS matrix to PS droplets in a PMMA matrix. Notably, bicontinuous morphologies were obtained at intermediate blend compositions, marking the first report of highly continuous domains obtained through demixing in a polymer blend compatibilized by Janus particles. The JPs were found to assemble in a densely packed monolayer at the interface, allowing for the stabilization of bicontinuous morphologies in films above the glass transition temperature by inhibiting coarsening and coalescence of the phase-separated domains. In conclusion, the rate of solvent evaporation from the drop-cast films and the molecular weights of the homopolymers were found to greatly affect blend morphology.
Research Organization:
Energy Frontier Research Centers (EFRC), Washington, D.C. (United States). Polymer-Based Materials for Harvesting Solar Energy (PHaSE)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0001087
OSTI ID:
1370311
Journal Information:
Macromolecules, Journal Name: Macromolecules Journal Issue: 12 Vol. 48; ISSN 0024-9297
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (7)

Fabrication of Nano-Sized Hybrid Janus Particles from Strawberry-Like Hierarchical Composites journal September 2018
Janus particles: from synthesis to application journal September 2017
Janus nanoparticles inside polymeric materials: interfacial arrangement toward functional hybrid materials journal January 2017
Distinctive phase separation dynamics of polymer blends: roles of Janus nanoparticles journal January 2019
Amphiphilic Janus nanosheets by grafting reactive rubber brushes for reinforced rubber materials journal January 2019
Co-assembly of Janus nanoparticles in block copolymer systems journal January 2019
Interfacial aggregation of Janus rods in binary polymer blends and their effect on phase separation journal September 2019

Figures / Tables (7)


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