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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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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Sinohara Souza, Patricia Moraes [1] ; Coelho, Felipe Mourao [1] ; Deroldo Sommaggio, Lais Roberta [2] ; Marin-Morales, Maria Aparecida [2] ; Morales, Ana Rita [1]
Total Authors: 5
[1] State Univ Campinas UNICAMP, Sch Chem Engn, Dept Mat Engn & Bioproc, Albert Einstein Ave 500, BR-13083852 Campinas, SP - Brazil
[2] Sao Paulo State Univ UNESP, Inst Biosci, Dept Biol, Rio Claro, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: JOURNAL OF POLYMERS AND THE ENVIRONMENT; v. 27, n. 7, p. 1584-1594, JUL 2019.
Web of Science Citations: 0

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 12months. 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. (AU)

FAPESP's process: 17/06103-7 - Study of the desintegration and biodegradation of poly(butylene adipate co-terephtalate) mulch films
Grantee:Felipe Mourão Coelho
Support Opportunities: Scholarships in Brazil - Scientific Initiation
FAPESP's process: 16/10777-0 - Study of PBAT mulch films: photodegradation, biodegradation and its cytotoxic, genotoxic and mutagenic effects in Allium cepa and human hepatoma HepG2 cells
Grantee:Patrícia Moraes Sinohara Souza
Support Opportunities: Scholarships in Brazil - Doctorate