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Issue 35, 2012
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Effect of ZnO nanofillers treated with triethoxy caprylylsilane on the isothermal and non-isothermal crystallization of poly(lactic acid)

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Abstract

The crystallization of PLA–silane surface-treated ZnO nanocomposites was investigated by DSC and compared to that of neat PLA. Several modes of crystallization were considered: isothermal and non-isothermal cold crystallization and also isothermal and non-isothermal melt crystallization. The kinetics of cold crystallization were studied using different methods, namely the Avrami and Ozawa–Flynn–Wall models, to calculate activation energies and kinetic constants. In contrast to what is typically observed when the foreign particles are added in a polymer matrix, the silane surface-treated ZnO delayed the crystallization of PLA and made it more difficult to start. The nucleation activity of the ZnO nanoparticles, ϕ, was calculated and found to be greater than 1 (ϕ = 1.7). This indicated that ZnO played an anti-nucleating role in the crystallization of PLA nanocomposites. This effect has been linked mainly to the interactions between the silane groups onto the surface of nanoparticles and PLA macromolecules. These interactions which reduce the mobility of polymer chains have been evidenced by rheological experiments.

Graphical abstract: Effect of ZnO nanofillers treated with triethoxy caprylylsilane on the isothermal and non-isothermal crystallization of poly(lactic acid)

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Publication details

The article was received on 16 May 2012, accepted on 18 Jul 2012 and first published on 19 Jul 2012


Article type: Paper
DOI: 10.1039/C2CP41574G
Phys. Chem. Chem. Phys., 2012,14, 12301-12308

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    Effect of ZnO nanofillers treated with triethoxy caprylylsilane on the isothermal and non-isothermal crystallization of poly(lactic acid)

    P. O. Bussiere, S. Therias, J. Gardette, M. Murariu, P. Dubois and M. Baba, Phys. Chem. Chem. Phys., 2012, 14, 12301
    DOI: 10.1039/C2CP41574G

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