Microstructure, nucleation and thermal properties of high-pressure crystallized MWCNT/nylon-6 composites
2011 (English)In: Polymer, ISSN 0032-3861, E-ISSN 1873-2291, Vol. 52, no 24, 5521-5527 p.Article in journal (Refereed) Published
Multi-wall carbon nanotube (MWCNT)/nylon-6 composites made by in-situ polymerization and subsequently modified by treatment at 1.0 GPa (or 1.7 GPa) and 530 K have been studied by WAXD, DSC and NMR. The pressure treatment gives an amorphous to crystalline transformation where the crystallinity increases from ∼31% to as much as ∼58% concurrently as the nylon-6 crystals increase in size and attain a preferred orientation relative to the applied pressure. A composite of 2.1 wt% purified MWCNT in nylon-6 shows significantly higher melting temperature than neat nylon-6 after identical pressure treatments. The improved thermal stability of the composite is attributed to crystal growth in the presence of reinforcing MWCNTs. The NMR spectrum of a pressure treated composite is similar to that of nylon-6 single crystals, which suggests a reduction of crystal boundaries after treatment, but there is no indication of covalent bonds between the nylon-6 chains and the MWCNTs.
Place, publisher, year, edition, pages
Elsevier , 2011. Vol. 52, no 24, 5521-5527 p.
Multi-wall carbon nanotube, Nylon-6, Thermal property
Engineering and Technology Natural Sciences
IdentifiersURN: urn:nbn:se:umu:diva-49310DOI: 10.1016/j.polymer.2011.09.036OAI: oai:DiVA.org:umu-49310DiVA: diva2:454653