Banca de DEFESA: LAURENICE MARTINS PEREIRA

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : LAURENICE MARTINS PEREIRA
DATA : 26/03/2018
HORA: 08:00
LOCAL: Sala I8 - Setor de aulas IV
TÍTULO:

STUDY OF POLY (METHYL METHACRYLATE) BLENDS WITH STYRENIC POLYMERS


PALAVRAS-CHAVES:

polymer blends, poly (methyl methacrylate), polystyrene, styrene-acrylonitrile copolymer, acrylonitrile-butadiene-styrene copolymer


PÁGINAS: 141
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
SUBÁREA: Materiais Não-Metálicos
ESPECIALIDADE: Polímeros, Aplicações
RESUMO:
Rheological and mechanical behavior of polymers blends obtained using acrylic polymers poly (methyl methacrylate homopolyer (PMMAh) and poly (methyl methacrylate) with elastomers (PMMAe) together with styrenic polymers polystyrene (PS), styrene-acrylonitrine copolymer (SAN) and acrylonitrile-butadiene-styrene copolymer (ABS), all with distinct chemical structures, was elucidated and the effect of addition has been evaluated. Blends samples were obtained by twin-screw extrusion followed by injection molding. Elementary chemical analyses of SAN and ABS showed that acrylonitrile (AN) percentage is suitable for mixing with PMMA, once the results of 25 and 21 %, respectively, are within miscibility window. Thermogravimetric analysis of styrenic polymers has demonstrated higher thermal stability over acrylic polymers. Capillary rheometry tests show that PMMAe exhibited higher viscosity in comparison to others, due to dispersed core-shell particles into PMMA. Increasing in fluidity was achieved when styrenic polymers were added to PMMA samples, resulting in improvements in processability. Mechanical results have shown that addition of SAN has improved both Elastic modulus and tensile strength, which was attributed to the presence of acrylonitrile. Blends with PMMAe have shown better elongation at break and impact strength in comparison to other acrylic compositions. For styrenic compositions, ABS has exhibited higher elongation at break. Results of impact strength of SAN and ABS were close, likely due to the insufficient amount of butadiene in blends, making impossible to absorb pendulum energy, due to its high-velocity. The hardness testing (Shore D) showed improvements in hardness when styrenic polymers were added to acrylics. Transition glass of polymers and blends were obtained from dynamic mechanic thermal analysis. Blends presented Tg values between their constituents. Tests at heat deflection temperature and Vicat softening point has indicated that upon the addition of styrenic polymers in the acrylic polymers, the thermal resistance increased.

MEMBROS DA BANCA:
Presidente - 1639676 - EDSON NORIYUKI ITO
Interno - 1755267 - MARIA CAROLINA BURGOS COSTA DO NASCIMENTO
Externo ao Programa - 2254759 - AMANDA MELISSA DAMIAO LEITE
Externo à Instituição - GUSTAVO DE FIGUEIREDO BRITO - UFPB
Externo à Instituição - TOMÁS JEFERSON ALVES DE MELO - UFCG
Notícia cadastrada em: 26/03/2018 07:45
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