The effect of small amounts (≤3 wt%) of short hemp fibers on stability of a poly(lactic acid) (PLA) in the molten state is investigated through time-resolved rheology. The decrease over time of the zero-frequency complex viscosity was correlated to severe hydrolytic degradation of the PLA matrix. A kinetic model that accounts for thermal degradation and hydrolysis was fitted to the experimental viscosity data. The significant fiber-induced hydrolysis is due to traces of residual water bound to the fibers inside the composites after the processing steps. A significant mitigation of the fiber-induced PLA hydrolysis can be obtained by carefully drying the hemp fibers before melt compounding and (to a lesser extent) by subjecting the fibers to an alkaline treatment. On the other hand, if the interest is a shorter persistence in the environment, natural fibers can be exploited to accelerate degradation of biocomposites.

Natural fiber-induced degradation in PLA-hemp biocomposites in the molten state / Mazzanti, V.; Salzano de Luna, M.; Pariante, R.; Mollica, F.; Filippone, G.. - In: COMPOSITES. PART A: APPLIED SCIENCE AND MANUFACTURING. - ISSN 1359-835X. - 137:(2020), p. 105990. [10.1016/j.compositesa.2020.105990]

Natural fiber-induced degradation in PLA-hemp biocomposites in the molten state

Salzano de Luna M.;Filippone G.
2020

Abstract

The effect of small amounts (≤3 wt%) of short hemp fibers on stability of a poly(lactic acid) (PLA) in the molten state is investigated through time-resolved rheology. The decrease over time of the zero-frequency complex viscosity was correlated to severe hydrolytic degradation of the PLA matrix. A kinetic model that accounts for thermal degradation and hydrolysis was fitted to the experimental viscosity data. The significant fiber-induced hydrolysis is due to traces of residual water bound to the fibers inside the composites after the processing steps. A significant mitigation of the fiber-induced PLA hydrolysis can be obtained by carefully drying the hemp fibers before melt compounding and (to a lesser extent) by subjecting the fibers to an alkaline treatment. On the other hand, if the interest is a shorter persistence in the environment, natural fibers can be exploited to accelerate degradation of biocomposites.
2020
Natural fiber-induced degradation in PLA-hemp biocomposites in the molten state / Mazzanti, V.; Salzano de Luna, M.; Pariante, R.; Mollica, F.; Filippone, G.. - In: COMPOSITES. PART A: APPLIED SCIENCE AND MANUFACTURING. - ISSN 1359-835X. - 137:(2020), p. 105990. [10.1016/j.compositesa.2020.105990]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/828723
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