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Competition between supernucleation and plasticization in the crystallization and rheological behavior of PCL/CNT-based nanocomposites and nanohybrids

AuthorsVega, Juan Francisco ; Fernández-Alcázar, Joel; López, Juan V.; Michell, Rose Mary; Pérez-Camargo, Ricardo A.; Ruelle, B.; Martínez-Salazar, Javier ; Arnal, M. L.; Dubois, Philippe; Müller, Alejandro J.
Differential scanning calorimetry (DSC)
Issue Date14-Jun-2017
PublisherJohn Wiley & Sons
CitationJournal of Polymer Science, Part B: Polymer Physics 55: 1310-1325 (2017)
AbstractPCL was blended with pristine multiwalled carbon nanotubes (MWCNT) and with a nanohybrid obtained from the same MWCNT but grafted with low molecular weight PCL, employing concentrations of 0.25 to 5 wt % of MWCNT and MWCNT-g-PCL. Excellent CNT dispersion was found in all samples leading to supernucleation of both nanofiller types. Nanohybrids with 1 wt % or less MWCNTs crystallize faster than nanocomposites (due to supernucleation), while the trend eventually reverses at higher nanotubes content (because of plasticization). Rheological results show that yield-like behavior develops in both nanocomposites, even for the minimum content of carbon nanotubes. In addition, the MWCNT-g-PCL family, when compared with the neat polymer, exhibits lower values of viscosity and modulus in oscillatory shear, and higher compliance in creep. These rheological differences are discussed in terms of the plasticization effect caused by the existence of low molecular weight free and grafted PCL chains in the nanohybrids. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 1310–1325.
Description16 pags., 14 figs., 4 tabs.
Publisher version (URL)http://doi.org/10.1002/polb.24385
Identifiersdoi: 10.1002/polb.24385
issn: 1099-0488
Appears in Collections:(CFMAC-IEM) Artículos
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