Banca de DEFESA: TEREZA RAQUEL RODRIGUES MARQUES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : TEREZA RAQUEL RODRIGUES MARQUES
DATE: 17/08/2023
TIME: 09:00
LOCAL: Programa de Pós-Graduação em Ciência de Materiais
TITLE:

DEVELOPMENT AND CHARACTERIZATION OF POLYMERS BASED ON POLYCAPROLACTONE (PCL) AND GINGER POWDER WITH PROTEOLYTIC PROPERTIES.

KEY WORDS:

Polycaprolactone; ginger; proteolytic enzyme; Zingibain.

PAGES: 65
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

As technologies evolve, functions other than conventional ones are required of plastic materials. In this sense, there is a growing demand for new polymers with specific functions, and one way to add these functionalities to polymers is through the use of natural additives, such as ginger, for example. Ginger rhizomes (Zingiber officinale) contain substances with several properties of interest, including enzymes with proteolytic activity, called Zingibaine. The interaction of enzymes with polymers can enable biological functions to be transferred to polymeric materials and bring improved functionality to these materials. In the present study, the extrusion technique was used to add ginger powder to the biodegradable polymer Polycaprolactone (PCL), with the objective of developing a functional polymer with proteolytic property, using the protease of ginger powder (Zingibaína) as a proteolytic agent and PCL as a polymeric matrix. The developed materials were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), mechanical assay and scanning electron microscopy (SEM). Furthermore, the presence of proteolytic activity in the formed polymers was evaluated. The results indicated the feasibility of using extrusion processing to incorporate the protease present in ginger powder into the polymer, where the three studied compositions showed proteolytic activity. FTIR analysis indicated that the matrix material was preserved after the addition of ginger powder. The TGA thermal analyzes showed that the PCL formulation with 3% ginger powder showed similar behavior to pure PCL. However, the formulations with 5% and 7% ginger showed a decrease of approximately 7.0°C and 7.5°C, respectively, in the initial degradation temperature. The DSC results showed that the concentrations used did not produce relevant thermal changes in these properties. The tensile tests showed that the elastic modulus did not vary significantly in any of the studied compositions. The values of stress at rupture and deformation at rupture decreased for samples with 5% and 7% of ginger powder, corroborating the SEM images. Therefore, with this study it was possible to develop a functional polymer, bringing the biological functions of the enzymes present in the ginger powder to the PCL matrix, without major changes in the matrix properties, thus expanding the applications of this biodegradable polyester.

COMMITTEE MEMBERS:
Presidente - 2572606 - GLORIA MARIA VINHAS
Interno - 1354207 - SEVERINO ALVES JUNIOR
Externa à Instituição - VIVIANE FONSECA CAETANO - UFPE