This thesis presents the study of nanocomposites based on immiscible
polymer blend of polycarbonate and acrylonitrile-butadiene-styrene
(PC/ABS) filled with multi-walled carbon nanotubes (MWCNT). The aim is to
achieve an improvement of mechanical properties and electrical conductivity
of the nanocomposites.
In an initial stage, a twin-screw extruder was used to obtain nanocomposites
by melt compounding. Three methods of carbon nanotubes addition were
studied: direct addition, dilution from a masterbatch and feeding of MWCNT
suspension in ethanol. For each method, the influence of nanofiller content
and processing parameters on morphology and final properties of the
nanocomposite was analyzed. Furthermore, the influence of two types of
carbon nanotubes modifications was studied: covalent modification by
surface-oxidation (MWCNT-COOH) and non-covalent modification by an
addition of surfactant promoting the nanofiller-matrix interactions.
A good dispersion of the MWCNT was obtained for masterbatch dilution and
suspension feeding. Both methods showed preferential localization of
carbon nanotubes in polycarbonate phase (PC).
Samples processed by masterbatch dilution showed the 30 % increase of
rigidity and a decrease of ductility of PC/ABS for 0.5 wt. % MWCNT.
Electrical conductivity was influenced by processing temperature and carbon
nanotubes type. The percolation threshold value was 2.0 wt. % for pristine
MWCNT and 1.5 wt. % for modified MWCNT-COOH.
Better balance of mechanical properties and electrical conductivity was
achieved in the samples obtained by the masterbatch route. These
properties were studied in a subsequent phase, when the extruded
nanocomposite was injection molded in order to obtain a defined geometry. / Wegrzyn, M. (2014). Nanocomposites of Multiphase Polymer Blend Reinforced with Carbon Nanotubes: Processing and Characterization [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/36869 / TESIS
| Identifer | oai:union.ndltd.org:upv.es/oai:riunet.upv.es:10251/36869 |
| Date | 07 April 2014 |
| Creators | WEGRZYN, MARCIN |
| Contributors | Benedito Borrás, Adolfo, Giménez Torres, Enrique, Universitat Politècnica de València. Departamento de Ingeniería Mecánica y de Materiales - Departament d'Enginyeria Mecànica i de Materials |
| Publisher | Universitat Politècnica de València |
| Source Sets | Universitat Politècnica de València |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/doctoralThesis, info:eu-repo/semantics/acceptedVersion |
| Source | Riunet |
| Rights | http://rightsstatements.org/vocab/InC/1.0/, info:eu-repo/semantics/openAccess |
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