8 research outputs found

    Diblock copolymers at a homopolymer-homopolymer-interface: a Monte Carlo simulation

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    The properties of diluted symmetric A-B diblock copolymers at the interface between A and B homopolymer phases are studied by means of Monte Carlo (MC) simulations of the bond fluctuation model. We calculate segment density profiles as well as orientational properties of segments, of A and B blocks, and of the whole chain. Our data support the picture of oriented ``dumbbells'', which consist of mildly perturbed A and B Gaussian coils. The results are compared to a self consistent field theory (SCFT) for single copolymer chains at a homopolymer interface. We also discuss the number of interaction contacts between monomers, which provide a measure for the ``active surface'' of copolymers or homopolymers close to the interface

    Microphase separation in linear multiblock copolymers under poor solvent conditions

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    Molecular dynamics simulations are used to study the phase behavior of linear multiblock copolymers with two types of monomers, A and B, where the length of the polymer blocks NAN_{A} and NBN_{B} (NA=NB=NN_{A}=N_{B}=N), the number of the blocks nAn_{A} and nBn_{B} (nA=nB=nn_{A}=n_{B}=n), and the solvent quality varies. The fraction ff of A-type monomers is kept constant and equal to 0.5. Whereas at high enough temperatures these macromolecules form coil structures, where each block A or B forms rather individual clusters, at low enough temperatures A and B monomers from different blocks can join together forming clusters of A or B monomers. The dependence of the formation of these clusters on the varied parameters is discussed in detail, providing a full understanding of the phase behavior of linear multiblock copolymers, at least for this symmetrical case.Comment: 8 pages, 12 figures, to be published in Soft Matte

    Anais do Seminário Internacional de Execuçao Penal : Estado, cárcere e direitos

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    Este livro corresponde aos Anais do Seminário Internacional de Execução Penal, realizado nos dias 18 e 19 de agosto de 2015, na Faculdade de Direito da Universidade Federal de Pelotas. O Seminário teve como objetivo principal o intercâmbio acadêmico e institucional entre discentes, docentes e profissionais de diferentes instituições do Brasil e da Argentina. Os eixos temáticos foram distribuídos desta maneira: sistema legal e progressividade de regime no cumprimento da pena; cidadania política e questão penitenciária; Estado, cárcere e heranças; decisões da Suprema Corte de Justiça Argentina sobre a pena de prisão; projetos, boas práticas e obstáculos em torno da questão penitenciária. O encontro se estruturou em conferências, painéis e grupos de trabalhos, proporcionando o aprofundamento do conhecimento dos participantes sobre assuntos em torno da execução penal e da questão penitenciária

    Die Erzeugung von Harnsteinen im Tierversuch

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