A thermogravimetric approach to study the influence of a biodegradation in soil test to a Poly(lactic acid)

• An amorphous grade Poly (lactic acid) (PLA) was selected for an accelerated burial in soil test during 450 days. Thermogravimetric analyses were carried out to study the effects of degradation in soil on the thermal stability and the thermal decomposition kinetics. A single stage decomposition process is observed for all degradation times. It is shown that the thermal stability of PLA is slightly affected by degradation in soil. Concerning the study of the thermal decomposition kinetics, Criado master curves were plotted from experimental data to focus the study of the thermodegradation kinetic model.The kinetic methods proposed by Broido and Chang were used to calculate the apparent activation energies (Ea) of the degradation mechanism. These results were compared to the Ea values obtained by the method developed by Coats and Redfern in order to prove the applicability of the former methods to the kinetic study. As expected, non-linear tendency is found out for Ea variation along the degradation times, which can be explained as an evolution by stages. Copyright © 2008 WILEY-VCH Verlag GmbH & Co. KGaA.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Kemiteknik -- Polymerteknologi (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Chemical Engineering -- Polymer Technologies (hsv//eng)

Nyckelord

Activation energy

Biodegradation in soil

Kinetics (polim.)

Poly(lactic acid)

Thermogravimetry analysis (TGA)

ABS resins

Acids

Biochemistry

Biodegradation

Body fluids

Decomposition

Gravimetric analysis

Lactic acid

Microbiology

Organic acids

Photoresists

Pyrolysis

Soil testing

Soils

Thermodynamic stability

Thermogravimetric analysis

Apparent activation energies

Decomposition processes

Degradation mechanisms

Degradation times

Experimental datums

Kinetic methods

Kinetic studies

Master curves

Polylactic acids

Single stages

Soil tests

Thermal decomposition kinetics

Thermal stabilities

Degradation

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