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Structural behavior of cylindrical polystyrene-block-poly(ethylene-butylene)-block-polystyrene (SEBS) triblock copolymer containing MWCNTs: on the influence of nanoparticle surface modification

  • Hasanabadi, Noushin Department of Polymer Engineering, Amirkabir University of Technology, Tehran, Iran
  • Nazockdast, Hossein Department of Polymer Engineering, Amirkabir University of Technology, Tehran, Iran
  • Gajewska, Bernadetta Adolphe Merkle Institute, University of Fribourg, Switzerland
  • Balog, Sandor Adolphe Merkle Institute, University of Fribourg, Switzerland
  • Gunkel, Ilja Adolphe Merkle Institute, University of Fribourg, Switzerland
  • Bruns, Nico Adolphe Merkle Institute, University of Fribourg, Switzerland
  • Lattuada, Marco Department of Chemistry, University of Fribourg, Switzerland
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    01.11.2017
Published in:
  • Macromolecular Chemistry and Physics. - 2017, vol. 218, no. 22, p. n
ATRP
CNT
DMTA
rheological characterization
SEBS block copolymer
structural development
English In this work, the influence of carbon nanotubes (CNTs) on the self-assembly of nanocomposite materials made of cylinder-forming polystyrene-block-poly(ethylene- butylene)-block-polystyrene (SEBS) is studied. CNTs are modified with polystyrene (PS) brushes by surface-initiated atom transfer radical polymerization to facilitate both their dispersion and the orientation of neighboring PS domains of the block copolymer (BCP) along modified CNT-PS. Dynamic rheology is utilized to probe the viscoelastic and thermal response of the nanoscopic structure of BCP nanocomposites. The results indicate that nonmodified CNTs increase the BCP microphase separation temperature because of BCP segmental confinement in the existing 3D network formed between CNTs, while the opposite holds for the samples filled with modified CNT-PS. This is explained by severely retarded segmental motion of the matrix chains due to their preferential interactions with the PS chains of the CNT-PS. Moreover, transient viscoelastic analysis reveals that modified CNT-PS have a more pronounced effect on flow-induced BCP structural orientation with much lower structural recovery rate. It is demonstrated that dynamic-mechanical thermal analysis can provide valuable insights in understanding the role of CNT incorporation on the microstructure of BCP nanocomposite samples. Accordingly, the presence of CNT has a significant promoting effect on microstructural development, comparable to that of annealing.
Faculty
Faculté des sciences et de médecine
Department
Département de Chimie, AMI - Physique de la matière molle, AMI - Chimie des polymères et matériaux
Language
  • English
Classification
Chemistry
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/306384
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