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Reutilização de fibras de para-aramida como reforço mecânico em poliamida 6,6
(Universidade Federal de São Carlos, 2016-06-09) Loureiro, Lucas; Bettini, Sílvia Helena Prado; https://lattes.cnpq.br/3687551763124327; https://lattes.cnpq.br/3045030177014245
Aramid fibers are very known by their excellent combination of tensile strength and elastic modulus with low density. On the other hand, aramids do not melt which difficult the recycling process. This property is an important issue for many companies that work with these materials since thousands of tons of aramid fibers are produced each year and there are just a few reutilization alternatives. This project evaluated a new alternative to reuse aramid fibers from industrial waste as mechanical reinforcement for polyamide 6,6. Another important characteristic of these fibers is the low interaction with polymeric matrices due to its intrinsic molecular stability and to finishing products that facilitates the spinning and weaving processes. In order to remove the finishing, the fibers were washed with methanol and hexane, but the hexane washed fibers showed better results. Surface treatments with NaOH solutions were also evaluated. It was reported in XPS results that NaOH solution hydrolyzed the fiber’s surface. However, conditions with higher NaOH concentration were too aggressive to the fiber’s mechanical properties. For this reason, it was selected two procedures: 2% NaOH at 30 minutes of exposure and 6% NaOH at 45 minutes of exposure. The composites were produced with two different fiber’s weight concentration, 5 and 10%. The results have shown that the surface treatment impacted the interfacial adhesion, but there was no increase on the composite’s mechanical properties due to the fiber’s mechanical damage caused by the treatment. The addition of 5% of fibers did not increase the mechanical properties probably due to the fact that 5% is near to the fiber’s critical volume for this composite. The composites with 10% of fibers showed better results and revealed a great potential for this reuse alternative for para-aramid fibers.
Batom na caveira : um estudo sobre as mulheres na Polícia Militar do Estado de São Paulo
(Universidade Federal de São Carlos, 2016-06-09) Denari, Giulianna Bueno; Sinhoretto, Jacqueline; https://lattes.cnpq.br/7743699562476490; https://lattes.cnpq.br/3350689550400145
This master's research aimed to understand and analyze the ways of policing the institution face to female labor transformation processes in the Police of São Paulo State Military (PMESP). The secondary objectives were to understand the discourses of the military police operations in PMESP, understanding the perception of these on their own performance and analyze the conflicts that gender differences causes in the various spheres that compose the institution. To accomplish these objectives we conducted qualitative interviews semi structured with military police officers (men and women) from the state institution of several patents and functions. Thus considerable part of the research was structured based on the analysis of experiences and professional female police trajectories of different generations. Also they were gathered press texts that bring the image and role of women in PMESP, seeking to understand the representations involving the image of women in the institution, using document analysis. The research had as main findings the process of transformation of own police work, from the analysis of female labor over the years. The ostensible policing, aimed at combating crime (especially crimes against property), no longer exclusively male work and becomes the focus of police activities as a whole. We could also point out as a result of the differences and disputes about the "real police work" in which the work "street" is more recognition that the "administrative work ". Finally, about the discourse on women, we highlight the changes to look the work of female police officers from the perspective of care for the design of the warrior police and finally the discursive tendency to erase the differences and classify all while police.