Banca de DEFESA: PAMELA BARCELAR FERREIRA GOMES DA SILVA DE LUNA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : PAMELA BARCELAR FERREIRA GOMES DA SILVA DE LUNA
DATE: 16/11/2021
TIME: 09:00
LOCAL: Google Meet
TITLE:

Effect of thyme essencial oil on the properties of poly (butylene adipate co-
terephthalate)

KEY WORDS:

PBAT, Thyme essential oil, active packaging

PAGES: 86
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

New materials are being developed to replace those that contribute to the accumulation of plastic
in my environment, such as the use of biodegradable polymers to produce plastic packaging.
PBAT (polybutylene adipate co-terephthalate) is a biodegradable polymer and can be used for the
manufacture of active packaging, technology that aims to extend the shelf life of the food,
ensuring the quality of the same. As a promising additive to this packaging we have the essential
oil of thyme, which adds desirable properties by having antimicrobial properties and eliminates
the use of chemical preservatives. Thus, the present work evaluated the effects of the essential oil
of thyme on the properties of poly (butylene adipate co-terephthalate), analyzing the antimicrobial
activity, physical, mechanical and thermal properties of PBAT active packages formulated with
essential oil of thyme, (FTIR), traction test, differential scanning calorimetry (DSC), and
thermogravimetric (TGA) analysis were performed using diffusion disc, Fourier transform
infrared spectroscopy (FTIR) techniques. The films were prepared by solvent casting with
different concentrations of oil (1, 2, 5, 10, 15 and 20%). Thyme oil had the concentrations of
52.16% o-cymene, 28.21% thymol and 13.26% carvacrol. The films presented bands
characteristic of both PBAT and oil, but in the films added it was necessary to perform the PCA
of the FTIR spectra to show the incorporation of the oil in the polymer matrix, which resulted in
five different groups. The oil presented antimicrobial activity against E. coli and S. aureus.
Regarding the mechanical properties, there was a reduction of the tension in the majority of the
samples added with oil, more pronounced in the samples with 15% of oil. As for the elastic
modulus, the samples with 20% oil showed a greater drop in stiffness, thus being more flexible

than the others. In the thermal properties (temperature, enthalpy and degree of crystallization and
melt temperature) they remained practically constant with the addition of the oil as well as the
stability and thermal degradation resembled the pure PBAT film. With these results, the PBAT
films incorporated with thyme essential oils showed to be promising for use as perishable food
packaging, also contributing to the reduction of conventional plastic.

BANKING MEMBERS:
Interno - 2457389 - EDUARDO PADRON HERNANDEZ
Presidente - 2572606 - GLORIA MARIA VINHAS
Externo à Instituição - IVO DIEGO DE LIMA SILVA