Abstract After the consolidation of the Brazilian biodiesel industry, issues related to the final destination of the glycerin, the by-product from the biodiesel industrial process, drawing the attention of several researchers. There are several uses to this byproduct. Among them, the obtaining of polymers, such as polyurethane (PU), are very encouraged since the glycerin ca be used, as well as the castor oil, in the replacement of petrochemical polyols. The aim of this work was to propose a new route for the obtainment of a petroleum sorbent based on polyurethane resin from glycerin and castor oil, through the emulsion technique. In addition, maghemite (γ-Fe2O3) was mixed to the polymer matrix, producing a magnetic composite, able to make easier the oil cleanup process. The products synthesized were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, simultaneous Thermogravimetry (TGA) and Differential scanning calorimetry (DSC), Optical microscopy, Scanning electron microscopy (SEM). In addition, magnetic force and oil removal capability tests were also performed. The magnetic material was used to remove oil from water, exhibited a good oil removal capability. In a typical test, 1g of the composite containing 5wt% of maghemite was able to remove 10g of oil from water.

Este trabalho envolve o planejamento, execução e avaliação de visitas guiadas ao Museu Nacional da Universidade Federal do Rio de Janeiro, por parte de alunos da rede pública do município do Rio de Janeiro. O referencial teórico considera o Modelo de John Falk, com seus aspectos pessoal, físico e sociocultural como facilitadores da aprendizagem em museus. O principal objetivo consistiu em analisar as visitas dos estudantes ao museu quanto à aprendizagem, motivação e ganhos afetivos. Procurou-se, também, estabelecer o Museu Nacional como um espaço para a elaboração de aulas não formais de química. Questionários foram aplicados antes, durante e depois das visitas. Os resultados obtidos permitiram concluir que o procedimento e a dinâmica desenvolvidos proporcionaram ganhos afetivos e cognitivos aos alunos visitantes, e que o contexto físico do Museu Nacional favorece a elaboração de aulas não formais de química, sobretudo para os alunos de nível Médio.

This work involved the planning, implementation and evaluation of guided visits by public school students from the municipality of Rio de Janeiro to the National Museum of Federal University of Rio de Janeiro (UFRJ). The theoretical background is the Contextual Model of Learning with its personal, physical and sociocultural contexts as facilitators of learning in museums. The main objective was to analyze the visits in relation to learning, motivation and affective gains. It was also aimed to establish the National Museum as a setting for the development of a non-formal school chemistry class. Questionnaires were administered before, during and after visits. The results showed that the procedure and dynamic developed were able to provide cognitive and affective gains for the students. The physical context of the National Museum promotes the development of non-formal classes in Chemistry, especially for high school students.