DEMAT - Departamento de Engenharia de Materiais

URI Permanente desta comunidadehttps://repositorio.ufrn.br/handle/1/130

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Effect of alumina on the properties of poly(methyl methacrylate)/alumina composites obtained by melt blending
(SAGE Publications, 2019-04-28) Ito, Edson Noriyuki; Arimateia, Rafaela R.; Hanken, Ruth B. L.; Oliveira, Akidauana D. B.; Agrawal, Pankaj; Freitas, Normanda L.; Silva, Erik dos Santos; Melo, Tomas Jeferson Alves
In this work, the properties of poly(methyl methacrylate) (PMMA)/alumina composites prepared by melt blending were evaluated. Two types of alumina were used: one, that was synthesized (ALS) by the combustion reaction method, and the other that is commercially available (ALC). Extrusion proved to be a good processing technique for obtaining PMMA/alumina composites. PMMA/alumina composites containing ALC presented higher alumina average particles size. The addition of alumina to PMMA substantially decreased the wear index and increased the scratch resistance. The mechanical properties of the composites containing ALS were similar to those containing ALC. The storage modulus (E0) increased with the addition of alumina to PMMA. The zero shear viscosity (h0) values of the composites containing ALC were higher than those of the composites containing ALS
Influence of amine groups in the chemical structure of photochromic dyes on the rheological and mechanical properties of poly(methyl methacrylate) (PMMA)
(Elsevier, 2017-07) Ito, Edson Noriyuki; Rego, José Kaio Max Alves do; Nascimento, José Heriberto Oliveira do; Agrawal, Pankaj; Melo, Tomas Jeferson Alves; Costa, Maria Carolina Burgos Costa do
Polymer modification has been used as a means to improve the adhesion/bonding of compounds and/or particles to polymer chains, but this goal is not always achieved. Some compounds contain naturally reactive groups which, in contact with the polymer, can modify its properties. This work focused on the rheological (torque and parallel plates rheometry) and mechanical (tensile and impact) characterization of PMMA containing the DV31, DBL3 and DB79 aminic dyes and the DR73 inert dye. The rheological results indicated that the final torque (torque rheometry) varied in response to increasing dye concentrations, and that the various dyes under study exhibited distinct behaviors (parallel plates rheometry). The mechanical tests revealed that, overall, the effect of the dyes on the properties of PMMA was negligible, except for DV31, that led to the decrease in the impact strength, possibly due to the bond between chains or segments of chains of the polymer. The presence, amount and type of amine in the dyes gave rise to significant rheological changes in PMMA because of the reactivity between the amine and the ether group of PMMA

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Navegando DEMAT - Departamento de Engenharia de Materiais por Autor "Agrawal, Pankaj"