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Disintegration and Biodegradation in Soil of PBAT Mulch Films: Influence of the Stabilization Systems Based on Carbon Black/Hindered Amine Light Stabilizer and Carbon Black/Vitamin E

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Abstract

This work characterized the disintegration and biodegradation of aged samples of PBAT films with and without photostabilization additives. The objective is to correlate these processes with properties affected after aging, i.e. molecular weight and gel content. Three different formulations were studied: pure polymer; PBAT with carbon black and hindered amine light stabilizer (HALS) and PBAT with carbon black and phenolic stabilizer vitamin E. The samples were monitored for 12 months. As expected, the lower level of photostabilization lead to the higher disintegration and biodegradation rates. Nevertheless, mineralization test showed that during time the differences among biodegradation rates become subtler. The crystallinity degree presented changes only at an advanced stage of degradation process, showing a reduction. The evaluation of the carbonyl index, molecular weight, surface morphology and visual analysis allowed to observe that the aged samples with lower gel content and lower molecular weight showed a faster degradation rate. The changes in material structure due to the increase of aromatic units concentration is the main hypothesis to explain the material behavior during degradation in soil.

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Acknowledgement

The authors thanks São Paulo Research Foundation-FAPESP (Process numbers 2016/10777-0, 2016/11999-0 and 2017/06103-7) by the financial support, Daniel Andrade de Siqueira Franco (Biological Institute, Campinas, Brazil) by the soil supplying used in this work, CABOT by carbon black providing, BASF by Ecoflex providing and AD & PG Comércio de Produtos Químicos Ltda by Tinuvin 783 supplying.

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Authors and Affiliations

  1. Department of Materials Engineering and Bioprocess, School of Chemical Engineering, State University of Campinas (UNICAMP), Albert Einstein Avenue, 500- Cidade Universitária, Campinas, SP, CEP 13083-852, Brazil

    Patrícia Moraes Sinohara Souza, Felipe Mourão Coelho & Ana Rita Morales

  2. Department of Biology, Institute of Biosciences, São Paulo State University (UNESP), Rio Claro, SP, Brazil

    Lais Roberta Deroldo Sommaggio & Maria Aparecida Marin-Morales

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  1. Patrícia Moraes Sinohara Souza
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  2. Felipe Mourão Coelho
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  3. Lais Roberta Deroldo Sommaggio
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  4. Maria Aparecida Marin-Morales
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  5. Ana Rita Morales
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Correspondence to Ana Rita Morales.

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Souza, P.M.S., Coelho, F.M., Sommaggio, L.R.D. et al. Disintegration and Biodegradation in Soil of PBAT Mulch Films: Influence of the Stabilization Systems Based on Carbon Black/Hindered Amine Light Stabilizer and Carbon Black/Vitamin E. J Polym Environ 27, 1584–1594 (2019). https://doi.org/10.1007/s10924-019-01455-6

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