期刊
POLYMERS
卷 12, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/polym12040753
关键词
biodegradable polymers; mulch films; soil burial test; Ecovio((R)); Mater-Bi-(R); polylactide; poly(butyleneadipate-co-butyleneterephtalate); polyethylene; polymer degradation; photo-oxidation
资金
- Polieco (Italy)
- Agriplast (Italy)
- POR FSE Sicily 2020 (project Polymeric systems: innovative aspects and applications in the biomedical and agri-food fields -SPIN OFF of Polymers)
- Call 11/2017 (Strengthening employability in the R&D system and the emergence of research SPIN OFFS in Sicily)
Polymer films based on biodegradable polymers, polyethylene (PE) and modified PE with oxo-degradable additive were prepared by film blowing. Carbon black (1%) was added to all the films. Commercial biodegradable Ecovio((R)) and Mater-Bi-(R) samples were used. Mechanical properties, soil burial degradation and surface wettability were investigated, before and after UV irradiation. Chemical modifications induced by UV and soil degradation, or a synergic effect, were highlighted by Attenuated Total Reflection-Fourier Transform Infra-Red (ATR-FTIR). Photo-oxidized film samples with an elongation at break equal to 50% and 0.5 the initial value were selected for the soil burial degradation test at 30 degrees C. Weight loss measurements were used to follow biodegradation in soil. Predictably, the degradation in soil was higher for biodegradable polymer-based films than for the PE-based ones. UV irradiation increased surface wettability and encouraged the disintegration in soil of all the samples. In fact, photo-oxidation produced a molar mass reduction and hydrophilic end groups, thus increasing surface erosion and weight loss. This paper not only supplies new criteria to evaluate the performance of biodegradable films in agriculture, before and after lifetime, but also provides a comparative analysis on the soil burial degradation behaviour with traditional ones.
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