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RESEARCH PRODUCT
Sonication-Induced Modification of Carbon Nanotubes: Effect on the Rheological and Thermo-Oxidative Behaviour of Polymer-Based Nanocomposites.
Cristian GambarottiFilippo ParisiRossella ArrigoNadka Tzankova DintchevaRosalia TeresiGiuseppe Lazzarasubject
sonicationMaterials scienceCNTs; Nanocomposites; Rheology; Sonication; Thermo-oxidative stability; UHMWPE; Materials Science (all)SonicationUHMWPE02 engineering and technologyCarbon nanotube010402 general chemistry01 natural scienceslcsh:TechnologyArticlelaw.inventionchemistry.chemical_compoundUHMWPE; CNTs; sonication; nanocomposites; rheology; thermo-oxidative stabilityThermal conductivityRheologylawnanocompositesthermo-oxidative stabilityGeneral Materials Sciencelcsh:Microscopylcsh:QC120-168.85chemistry.chemical_classificationNanocompositeCNTslcsh:QH201-278.5lcsh:TPolymerPolyethylene021001 nanoscience & nanotechnology0104 chemical scienceschemistryChemical engineeringlcsh:TA1-2040Interphaselcsh:Descriptive and experimental mechanicsrheologylcsh:Electrical engineering. Electronics. Nuclear engineeringMaterials Science (all)0210 nano-technologylcsh:Engineering (General). Civil engineering (General)lcsh:TK1-9971description
The aim of this work is the investigation of the effect of ultrasound treatment on the structural characteristics of carbon nanotubes (CNTs) and the consequent influence that the shortening induced by sonication exerts on the morphology, rheological behaviour and thermo-oxidative resistance of ultra-high molecular weight polyethylene (UHMWPE)-based nanocomposites. First, CNTs have been subjected to sonication for different time intervals and the performed spectroscopic and morphological analyses reveal that a dramatic decrease of the CNT's original length occurs with increased sonication time. The reduction of the initial length of CNTs strongly affects the nanocomposite rheological behaviour, which progressively changes from solid-like to liquid-like as the CNT sonication time increases. The study of the thermo-oxidative behaviour of the investigated nanocomposites reveals that the CNT sonication has a detrimental effect on the thermo-oxidative stability of nanocomposites, especially for long exposure times. The worsening of the thermo-oxidative resistance of sonicated CNT-containing nanocomposites could be attributed to the lower thermal conductivity of low-aspect-ratio CNTs, which causes the increase of the local temperature at the polymer/nanofillers interphase, with the consequent acceleration of the degradative phenomena.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-03-05 | Materials (Basel, Switzerland) |