Banca de QUALIFICAÇÃO: CARLOS ALBERTO SOARES DOS SANTOS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : CARLOS ALBERTO SOARES DOS SANTOS
DATE: 23/11/2022
TIME: 15:00
LOCAL: Campus de Santo André - Bloco B - Sala a ser definida
TITLE:

Polihidroxibutirato plastificado com oligomero de poliéster

PAGES: 78
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
SPECIALTY: Polímeros, Aplicações
SUMMARY:

In 2021, the global production of petroleum-based plastic reached over 400 million metric tons (Mt) year, the accumulation of these non-biodegradable plastics in the environment is a global problem. Polyhydroxybutyrate (PHB) offers many advantages over traditional  polymers as it is bio-based, biodegradable and non-toxic. The (PHB) belongs to the class of hydroxyalkanoates (PHAs) and its obtained by the synthesis of CO2 as an energy reserve inside the cells in many bacteria. This polymer plays an important role in medical and industrial applications with properties comparable to synthetic polyester and polypropylene. But,  the low thermal stability and narrow processing window limit the PHB use. The present work proposes to analyze the effect of two linear-chain polyester oligomers, called low molar mass polyester (PES) and polylactic acid (PLA), at three concentrations (10, 20 and 30% by weight) on PHB.  The concentrations of polymeric plasticizers obtained by solubilization and characterized by thermal analyzes such as differential scanning calorimetry (DSC), to verify the improvement in thermal transitions with reduction of Tg and Tm as  function of the plasticizer concentration, which can ease material handling. Polarized Optical Microscopy (POM) and XRD used to verify the influence of plasticizers on PHB morphologies, and in the tensile test occured  an improvement in the elongation at break with the addition of concentrations of plasticizers, and PES proved to be the The most promising of the two with an optimized condition of 20%, in which there was a decrease in modulus of elasticity of up to 72% and an increase in maximum elongation of 467%.

BANKING MEMBERS:
Presidente - Interno ao Programa - 1761120 - DANILO JUSTINO CARASTAN
Membro Titular - Examinador(a) Externo à Instituição - JÚLIA ROCHA GOUVEIA
Membro Titular - Examinador(a) Externo à Instituição - ANA PAULA LEMES
Membro Suplente - Examinador(a) Interno ao Programa - 1671298 - RENATO ALTOBELLI ANTUNES
Membro Suplente - Examinador(a) Externo ao Programa - 1730526 - SUEL ERIC VIDOTTI
Membro Suplente - Examinador(a) Externo ao Programa - 1850090 - ANNE CRISTINE CHINELLATO