Disintegration in Compost Conditions and Water Uptake of Green Composites from Poly(Lactic Acid) and Hazelnut Shell Flour

Green composites of poly(lactic acid)-PLA and hazelnut shell flour (HSF) with and without epoxidized linseed oil (ELO) as plasticizer/compatibilizer were subjected to different aging conditions such as water uptake by immersion and disintegration in compost soil. The effect of the hydrolytic degrada...

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Bibliographic Details
Published in:Journal of polymers and the environment 2018-02, Vol.26 (2), p.701-715
Main Authors: Balart, J. F., Montanes, N., Fombuena, V., Boronat, T., Sánchez-Nacher, L.
Format: Article
Language:English
Subjects:
ABRASION
AGING
Biodegradable materials
Biological activity
CALORIMETRY
Chemistry
Chemistry and Materials Science
COMPOST
Composting
Composts
CRACK PROPAGATION
Differential scanning calorimetry
Diffusion coefficient
Disintegration
Electron microscopy
Environmental Chemistry
Environmental Engineering/Biotechnology
Flour
Hazelnuts
Immersion
Industrial Chemistry/Chemical Engineering
LACTIC ACID
LINSEED OIL
MATERIALS SCIENCE
Microbial activity
Microorganisms
NUTS
Original Paper
PLASTICIZERS
Polylactic acid
Polymer Sciences
SCANNING ELECTRON MICROSCOPY
SOILS
WATER
Water immersion
Water uptake
Weight gain measurement
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Summary:Green composites of poly(lactic acid)-PLA and hazelnut shell flour (HSF) with and without epoxidized linseed oil (ELO) as plasticizer/compatibilizer were subjected to different aging conditions such as water uptake by immersion and disintegration in compost soil. The effect of the hydrolytic degradation was analyzed by measuring the weight gain as a function of the immersion time in water and calculating the corresponding diffusion coefficients. As expected, the water diffusion coefficient increases with HSF content while no remarkable change is obtained for plasticized compositions with ELO. Differential scanning calorimetry reveals a noticeable increase in crystallinity after the degradation process by water immersion. Degradation in controlled compost soil was followed thorough measurements of weight changes. In general, the weight change for a particular degradation time is lower as the HSF content increases. In addition, presence of ELO as plasticizer/compatibilizer delays the degradation process in compost soil. Scanning electron microscopy highlighted a noticeable deterioration of aged samples after 2 weeks with multiple crack formation and high surface abrasion due to microbial activity after 4 weeks.
ISSN:1566-2543
1572-8919
1572-8900
DOI:10.1007/s10924-017-0988-3