Identification of biodegradable and oxo-biodegradable plastic bags samples composition.
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2016
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Resumo
Plastic films used to make market bags are based on polymers such as
polyethylene, polystyrene and polypropylene. These materials require a long time
to degrade in the environment. Alternative technologies have been developed to
reduce the degradation time and the impact on the environment caused by
the conventional polymer materials, using pro-degrading additives or by the
development of biodegradable polymers. In Brazil, some city’s laws require the use of
biodegradable material in the production of market bags, but the absence of specific
surveillance policies makes their chemical composition unknown. The plastic bags
didn’t show the expected environmental behavior by the manufactures, so it is
important to understand the reasons why they are not biodegradable in Brazilian
landfills. In this paper, 7 samples that were obtained from a trading company and
commercial market of Belo Horizonte were analyzed. The samples were characterized
by biodegradable analysis, XRF, FTIR, SEM and TGA/DTA, which allowed the
identification and evaluation of the thermal behavior of the material in an inert and
oxidizing atmosphere. The results showed that plastic bags were composed by a
mixture of PLA and PBAT, with possible presence of TPS and titanium and calcium
fillers. All samples presented low biodegradability in compostable environment.
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Biodegradable, Oxo-biodegradable, Blends, Biopolymers
Citação
QUINTÃO, C. M. F.; NOVACK, K. M.; SILVA, A. C. B. Identification of biodegradable and oxo-biodegradable plastic bags samples composition. Macromolecular Symposia, v. 367, p. 9-17, 2016. Disponível em: <http://onlinelibrary.wiley.com/doi/10.1002/masy.201500156/abstract>. Acesso em: 15 set. 2017.