Banca de DEFESA: JUCIKLÉCIA DA SILVA REINALDO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : JUCIKLÉCIA DA SILVA REINALDO
DATA : 23/11/2017
HORA: 08:00
LOCAL: Auditório do CCET
TÍTULO:

RHEOLOGICAL STUDY OF POLYMER BLENDS WITH POLY (METHYL METHACRYLATE) AND DIFFERENTS STYRENIC POLYMERS


PALAVRAS-CHAVES:
Rheology, Polymer Blends, PMMA/PS, PMMA/SAN, PMMA/ABS, PMMA/MBS.

PÁGINAS: 118
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Materiais e Metalúrgica
RESUMO:
The aim of this work was to investigate the influence of the effect of the chemical structures on the rheological behavior in the linear viscoelastic of polymer blends consisting of acrylic and styrene polymers, i.e., poly (methyl methacrylate) homopolymer (PMMAh), poly (methyl methacrylate) copolymer (PMMAe), polystyrene (PS), styrene-acrylonitrile copolymer (SAN) and acrylonitrile-butadiene-styrene copolymer (ABS) and methyl methacrylate-butadiene-styrene copolymer (MBS). Preliminary characterization of the pure polymers shows by Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) that the copolymers had different chemical structures based on acrylics, styrene, acrylonitrile, butadiene and other elastomer types present in the PMMAe copolymer. The results of the chemical compositions of the styrenic copolymers (SAN and ABS) presented percentage of AN that is within the window of miscibility for mixtures developed with the PMMA, i.e., of 25 and 21% respectively. The rheological results obtained at low shear rates in the region of linear viscoelasticity showed that there was a significant change in the rheological behavior in relation to the use of acrylic homopolymer in the development of the polymer blends, when compared to the use of acrylic copolymerized with elastomeric particles. It was possible to indicate the miscibility mixture of polymer blends with structural variation of the minority components (styrenic polymers) by means of the linear viscoelastic behavior of these polymer blends. The morphological results obtained by scanning electron microscopy (SEM) showed the immiscibility in the polymer blends with PS and a probability of miscibility between the SAN and the SAN phase of the ABS with the PMMAh forming a single phase, corroborating with the rheological results. However, polymer blends with PMMAe and ABS presented complex microrreological results, because both polymers presented elastomeric phases. The morphological results, obtained by transmission electron microscopy (TEM) together with the results of glass transition temperature (Tg) by DSC, led to the proposal in this work that the elastomeric domains of PMMAe are formed by the butyl acrylate-polystyrene copolymer (PBA-co-PS) in core-shell with PMMA.

MEMBROS DA BANCA:
Presidente - 1639676 - EDSON NORIYUKI ITO
Externo à Instituição - LUIZ ANTÔNIO PESSAN - UFSCAR
Externo à Instituição - MARCELO MASSAYOSHI UEKI - UFS
Externo à Instituição - PANKAJ AGRAWAL - UFCG
Externo à Instituição - TOMÁS JEFERSON ALVES DE MELO - UFCG
Notícia cadastrada em: 25/10/2017 08:23
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