Thermal and thermo-oxidative stability and kinetics of decomposition of PHBV/sisal composites

• The decomposition behaviours of composites made of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and sisal were assessed in terms of thermal stability and decomposition kinetics, under inert and oxidative conditions, by means of multi-rate linear non-isothermal thermogravimetric experiments. A statistical design of experiments was applied to study the influence of the addition of sisal (0–10–20–30%wt), the presence coupling agent (Yes/No) and the applied conditions of work (inert or oxidative). An improvement of the thermal and thermo-oxidative stability of PHBV with the addition of sisal was observed for all cases. An accurate methodology based on iso-conversional methods was applied to simulate the potential of thermal recovery technologies, such as pyrolysis and controlled combustion, to use these biocomposites after the end of their service life. The mathematical descriptions of both thermo-chemical reactions were helpful in the evaluation of the eventual optimal operational conditions to carry out a suitable energetic valorisation. A minimum of 240°C and 137 kJ/mol of activation energy in inert conditions and 236°C and 118 kJ/mol in oxidative conditions ensured the feasibility of the reactions regardless the composition of the PHBV/sisal biocomposites, which may ease the operability of further energy valorisation with the aim to turn biowaste into new fuels.

Ämnesord

NATURVETENSKAP  -- Kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences (hsv//eng)

Nyckelord

Biocomposites

kinetics

natural fibres

poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV)

sisal

thermal decomposition

thermo-oxidative decomposition

waste-to-fuel

Activation energy

Composite materials

Coupling agents

Decomposition

Design of experiments

Enzyme kinetics

Natural fibers

Oxidation resistance

Pyrolysis

Thermal oil recovery

Waste incineration

Bio-composites

Mathematical descriptions

Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

Statistical design of experiments

Thermo-gravimetric experiments

Thermo-oxidative stability

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)