期刊
THERMOCHIMICA ACTA
卷 597, 期 -, 页码 48-57出版社
ELSEVIER
DOI: 10.1016/j.tca.2014.10.007
关键词
Poly(L-lactic acid); Graphene oxide; Nanocomposites; Thermal properties; Dielectric relaxation; Biodegradation
资金
- European Union (European Social Fund - ESF)
- Greek National Funds through the Operational Program Education and Lifelong Learning of the National Strategic Reference Framework (NSRF) - Research Funding Programs: Heracleitus II, Investing in Knowledge Society through the European Social Fund
Graphene oxide (GO) and graphene oxide modified with dodekylamine (org-GO) were combined with poly(L-lactic acid) (PLLA) to prepare new nanocomposites. WAXD patterns showed that in nanocomposites the GO and org-GO was exfoliated, as the characteristic peaks of the filler totally disappeared. Thermal behavior of the nanocomposites was studied with DSC and compared to that of the neat PLLA. Acceleration of crystallization was observed under isothermal or non-isothermal conditions. The org-GO showed enhanced nucleation activity, resulting in faster crystallization rates in the respective nanocomposites. No substantial change in the glass transition temperature was observed, but a lower increase in heat capacity was found in nanocomposites, in good correlation with a lower dielectric strength of the segmental relaxation associated with the glass transition. Biodegradation rates were enhanced in nanocomposites. (C) 2014 Elsevier B.V. All rights reserved.
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