Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 4: Nanoparticles, Nanocrystals and Composites I
CPP 4.9: Vortrag
Montag, 7. März 2016, 11:45–12:00, H41
Enhanced Dispersion and Alignment of Carbon Nanotubes by a High Molar Mass Amphiphilic Block Copolymer — Matthias M. L. Arras, •Roy Zitzmann, Bojia He, and Klaus D. Jandt — Chair of Materials Science (CMS), Otto-Schott-Institut für Materialforschung, Friedrich-Schiller-Universität, Jena, Germany
In this contribution multi-wall carbon nanotubes (MWCNTs) were simultaneously dispersed and aligned in a nanocomposite by using a high molar mass amphiphilic block copolymer (HMMABCP) matrix. HMMABCPs are promising because they are blendable with homopolymers of technically relevant molar masses. The hypotheses were tested that a HMMABCP can (i) disperse MWCNTs (ii) by a mechanism similar to low molar mass BCPs and (iii) be melt-drawn to align the MWCNTs while maintaining the degree of dispersion. The dispersion of MWCNTs within poly(styrene)-block-poly(2-vinylpyridine) (PS-b-P2VP) (Mw≈500 kg mol−1) and its homopolymers (control) in non-selective and selective solvents were investigated. PS-b-P2VP greatly improved the MWCNT dispersion which was long-term stable. The dispersion mechanism was identified as BCP micelle mediated steric stabilization. A melt-drawn MWCNTPS-b-P2VP nanocomposite film showed a high degree of MWCNT dispersion and alignment. In comparison to a similarly processed MWCNTpoly(ethylene) nanocomposite film, the MWCNT dispersion in PS-b-P2VP was strongly enhanced. This contribution highlights the advantages of an intrinsically dispersive matrix which may facilitate the future application of functional nanocomposites.