The effect of short polystyrene brushes grafted from graphene oxide on the behavior of miscible PMMA/SAN blends
- 1. Lodz University of Technology, Lodz
- 2. Center of Polymer Systems, Tomas Bata University, Zlin
- 3. Institute of Macromolecular Chemistry, Czech Academy of Sciences, Prague
- 4. Johannes Kepler University, Linz
- 5. Polymer Institute, Slovak Academy of Sciences, Bratislava
Description
A new concept of utilization of particle-polymer hybrids as multifunctional additives for polymer blends was
introduced in this study. Graphene oxide particles with short densely grafted polystyrene brushes (GO-g-PS) were
prepared by surface-initiated atom transfer radical polymerization (SI-ATRP). Melt rheology studies revealed
that GO-g-PS suppressed the phase separation of miscible poly(methyl methacrylate)/poly(styrene-co-acrylonitrile)
(PMMA/SAN) blends. The studies suggested specific interactions of GO-g-PS with the PMMA phase and this
was confirmed based on calculations of activation energies of segmental relaxations by broadband dielectric
spectroscopy (BDS). These unusual interactions of GO-g-PS with PMMA phase were assigned to the specific and
precise architecture of the GO-g-PS particles as well as chemical nature of PS polymer brushes. The short chains
of PMMA and PS provide miscibility originating from UCST behavior of PMMA/PS blend of short polymer chains.
Additionally, BDS also revealed improved charge transport in PMMA/SAN blend in presence of GO-g-PS hybrid.
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