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Estudo dos resíduos perigosos do campus de Araras da Universidade Federal de São Carlos visando a sua gestão
(Universidade Federal de São Carlos, 2010-07-28) Saqueto, Karla Carolina; Salvador, Nemésio Neves Batista; https://lattes.cnpq.br/9930582531600560; https://lattes.cnpq.br/7669474258357906
For that management of the hazardous wastes be held of correct environmental way, technical and administrative arrangements should be implemented, involving the prevention and effective control of generation until its final disposition. Considering the importance and complexity of the wastes management at universities, the objective of this work is to make a diagnosis and analysis of the questions involving dangerous wastes generated by the Centre for Agrarian Sciences - UFSCar campus from Araras city, in order to propose management of these wastes, with the aim of promoting reduction and/or elimination of the environment impact caused by improper discard, based on necessities and particularities of UFSCar campus and literature related. Were discussed some important concepts about thematic of wastes in the university, as well as the best ways of management of hazardous wastes in theses institutions. Aiming to set particularities of the campus from Araras city was accomplished the diagnose and characterization of the dangerous wastes by applying a semi-structured interview with the manager staff of the wastes sectors. Due the diversity of labs, 116 differents itens of wastes are generated, these wastes can be separated in categories and they present different degree of risk. However, in the campus from Araras city are storaged more than a half (54,4%) of these wastes, considered dangerous, the remainder part of it, is discard of wrong way. The data about waste treatment, show that just 8,5 liters per month of wastes perform some treatment, ie, less than 2% of the total generated. Fortunately, it is feasible that this reality can be changed leading the college to a correct control of their wastes. However it is necessary to create a recycling conscience and informations, that are able to change the complex circunstances present in the university.
Preparação e caracterização mecânica, térmica e elétrica de misturas de poliuretano derivado do óleo de mamona e poli (o- metoxianilina) para avaliação na aplicação como sensores para língua eletrônica
(Universidade Federal de São Carlos, 2010-07-28) Alves, William Ferreira; Mattoso, Luiz Henrique Capparelli; https://lattes.cnpq.br/5839043594908917; https://lattes.cnpq.br/1312419546878025
The incorporation of conducting polymer into a conventional polymer matrix has received considerable attention in the last decade because of the possibility of combining the good processability and mechanical performance of the conventional polymer with the electrical optical properties of conducting polymer. Among conducting polymers, polyaniline (PANI) and its derivatives has been extensively used because of the low cost of raw material, ease of synthesis and environmental stability. The main objective of this study was to develop a sensor for electronic tongue, from thin films of blends of polyurethane with POMA on interdigitated electrodes produced by spin-coating technique, under optimized conditions, and check the electrical behavior of the sensors in states doped. Films PUR mixture with POMA, although they may have less sensitivity to the substances found in the analyte than the nano-structured films, they may have better adherence and therefore be used to analyze substances with which the nano-structured films would not be possible. Films mixture of polyurethane derived from castor oil (PUR) and POMA were obtained by the casting (free standing) and also on interdigitated electrodes by the method of spin coating. The films were characterized using the techniques of UV-Vis-Nir, thermo-dynamic-mechanical analysis (DMTA), thermogravimetric analysis (TGA), stress-strain and optical microscopy. The values of modulus of elasticity of the PUR solvent chloroform (PUR-Clo) for the mixture of PUR/POMA (m/m) 50/50 had values of 0.3 GPa and 4.1 GPa, respectively. With the incorporation of 10% of POMA in the PUR glass transition temperature (Tg) of the films increased from 67 to 137oC, respectively. For the analysis done by DMA, the films with 30, 40 and 50% of POMA in PUR, confirmed the presence of crosslinking between the polymers, Mc, values of 195, 322 and 517 mol/m3, respectively. The films doped with NH4OH and HCl have better response capacitive and resistive to various analytes analyzed in the frequency range 1-105 Hz Thus, the sensors doped and dedoped can be used as an identifier of fingerprint detection of substances in different concentrations.