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| Author(s): |
Natalia Bahia Barbosa
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Escola Politécnica (EP/BC) |
| Defense date: | 2018-07-06 |
| Examining board members: |
Reinaldo Giudici;
Wilson Hideki Hirota;
Liliane Maria Ferrareso Lona
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| Advisor: | Reinaldo Giudici |
| Abstract | |
In this work the reactivity ratios for the copolymerization between styrene and VeoVa-10 were determined through an experimental study of solution copolymerization in toluen. The parameters were obtained by fitting the experimental data with the Mayo-Lewis and Meyer-Lowry models using the error-in-variables criterion (non-linear least squares method that considers the existence of errors in all measured variables). The experimental methodology developed, solution polymerization in ampoules prepared in a glove box and reacted at 80 °C, resulted in low conversion of the monomers, suitable for estimation of the reactivity ratios by the models employed. The samples were analyzed quantitatively by infrared spectroscopy to determine, during the reaction, the conversion and the mole fractions of each monomer in the mixture, the composition of the copolymer being obtained by the consumption of the monomers. Very different reactivity ratios were obtained (rstyrene = 49.926 and rVeoVa10 = 1.062), showing that the batch copolymerization of these monomers leads to large composition drift, with a tendency to form two homopolymers. The same copolymerization system was also tested in emulsion polymerization process, in semi-continuous and intermittent batch modes. The overall conversion of the monomers and the mean particle diameter distribution were analyzed during the reaction through the samples collected throughout the process. The effects of the feeding strategies evaluated were only preliminary, as they did not present conclusive results. (AU) | |
| FAPESP's process: | 15/08299-0 - Synthesis and characterization of polymeric nanoparticles through emulsion polymerization of styrene and VeoVa 10: influence of the feeding regime under different operational conditions |
| Grantee: | Natália Bahia Barbosa |
| Support Opportunities: | Scholarships in Brazil - Master |