Effect of macromolecule orientation on the coeficient of friction of thermoplastic polymers
During a previous study, focused on the tribological characteristics of PTFE (polytetrafluoroethylene), the possibility that the orientation of carbonic macromolecules might have influence upon the tribological properties of PTFE was raised. The current study proposes to perform an analysis of sampl...
| Autor principal: | Johnson, Nicholas Royden Martingo |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
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Universidade Tecnológica Federal do Paraná
2021
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http://repositorio.utfpr.edu.br/jspui/handle/1/24018 |
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riut-1-240182021-01-27T06:10:23Z Effect of macromolecule orientation on the coeficient of friction of thermoplastic polymers Johnson, Nicholas Royden Martingo Silva, Carlos Henrique da Silva, Carlos Henrique Araújo, Márcia Silva de Amaral, Pedro Luiz Fiad do Tribologia Termoplásticos Processos de fabricação Macromoléculas Tribology Thermoplastics Manufacturing processes Macromolecules CNPQ::ENGENHARIAS::ENGENHARIA MECANICA::PROCESSOS DE FABRICACAO During a previous study, focused on the tribological characteristics of PTFE (polytetrafluoroethylene), the possibility that the orientation of carbonic macromolecules might have influence upon the tribological properties of PTFE was raised. The current study proposes to perform an analysis of samples of different polymers, evaluating and quantifying the effect of this characteristic on the different tribological properties of each of these materials. Preliminary scratch tests, followed by characterization, by means of measurements on a rugosimeter and a durometer, were performed on samples of hot rolled, pure PTFE. These tests confirmed the influence of the orientation of the scratch, with respect to the direction of lamination of the samples, upon their tribological properties, as the COF presented reduced values in the longitudinal direction, while a higher degree of wear was suffered. After the validation of the method, samples of PP, HDPE and UHMWPE were also prepared, tested and analysed for result comparison between different materials. The results showed that all the materials, with the exception of UHMWPE had a reduction on the values of friction when it was measured longitudinally to the manufacturing flow direction (alignment direction of the macromolecules), while no significant change in wear was observed. Em estudo anterior, focado em características tribológicas de amostras de politetrafluoroetileno (PTFE), foi levantada a possibilidade da influência da orientação das macromoléculas carbônicas nas suas propriedades tribológicas. O estudo atual se propõe a realizar uma análise em amostras de diferentes polímeros, avaliando e quantificando o efeito dessa característica nas diferentes propriedades tribológicas de cada um desses materiais. Ensaios preliminares de riscamento, seguidos de caracterização, por meio de medições em um rugosímetro e em um durômetro, foram realizados em amostras de PTFE puro laminado a quente, confirmando a influência da orientação do riscamento com relação às direções de laminação das placas, sendo que para o riscamento na direção longitudinal, o COF apresentou valores reduzidos, e valores de desgaste elevados, comparativamente à direção transversal. Após a validação do método por meio dos ensaios preliminares, foram preparadas amostras de polipropileno (PP), polietileno de alta densidade (HDPE), e polietileno de ultra alto peso molecular (UHMWPE) que foram igualmente ensaiados e analisados para comparação dos resultados para diferentes materiais. Os resultados demonstraram que para todos os materiais, com exceção do UHMWPE houve uma redução no atrito quando medido longitudinalmente à direção de estiramento de fabricação (direção de alinhamento das macromoléculas), e não foi observada alteração significativa no desgaste. 2021-01-26T19:57:58Z 2021-01-26T19:57:58Z 2019-12 bachelorThesis JOHNSON, Nicholas Royden Martingo. Efeito da orientação das macromoléculas no coeficiente de atrito de polímeros termoplásticos. 2019. Trabalho de Conclusão de Curso (Bacharelado em Engenharia Mecânica) - Universidade Tecnológica Federal do Paraná, Curitiba, 2019. http://repositorio.utfpr.edu.br/jspui/handle/1/24018 por openAccess application/pdf Universidade Tecnológica Federal do Paraná Curitiba Brasil Bacharelado em Engenharia Mecânica UTFPR |
| institution |
Universidade Tecnológica Federal do Paraná |
| collection |
RIUT |
| language |
Português |
| topic |
Tribologia Termoplásticos Processos de fabricação Macromoléculas Tribology Thermoplastics Manufacturing processes Macromolecules CNPQ::ENGENHARIAS::ENGENHARIA MECANICA::PROCESSOS DE FABRICACAO |
| spellingShingle |
Tribologia Termoplásticos Processos de fabricação Macromoléculas Tribology Thermoplastics Manufacturing processes Macromolecules CNPQ::ENGENHARIAS::ENGENHARIA MECANICA::PROCESSOS DE FABRICACAO Johnson, Nicholas Royden Martingo Effect of macromolecule orientation on the coeficient of friction of thermoplastic polymers |
| description |
During a previous study, focused on the tribological characteristics of PTFE (polytetrafluoroethylene), the possibility that the orientation of carbonic macromolecules might have influence upon the tribological properties of PTFE was raised. The current study proposes to perform an analysis of samples of different polymers, evaluating and quantifying the effect of this characteristic on the different tribological properties of each of these materials. Preliminary scratch tests, followed by characterization, by means of measurements on a rugosimeter and a durometer, were performed on samples of hot rolled, pure PTFE. These tests confirmed the influence of the orientation of the scratch, with respect to the direction of lamination of the samples, upon their tribological properties, as the COF presented reduced values in the longitudinal direction, while a higher degree of wear was suffered. After the validation of the method, samples of PP, HDPE and UHMWPE were also prepared, tested and analysed for result comparison between different materials. The results showed that all the materials, with the exception of UHMWPE had a reduction on the values of friction when it was measured longitudinally to the manufacturing flow direction (alignment direction of the macromolecules), while no significant change in wear was observed. |
| format |
Trabalho de Conclusão de Curso (Graduação) |
| author |
Johnson, Nicholas Royden Martingo |
| author_sort |
Johnson, Nicholas Royden Martingo |
| title |
Effect of macromolecule orientation on the coeficient of friction of thermoplastic polymers |
| title_short |
Effect of macromolecule orientation on the coeficient of friction of thermoplastic polymers |
| title_full |
Effect of macromolecule orientation on the coeficient of friction of thermoplastic polymers |
| title_fullStr |
Effect of macromolecule orientation on the coeficient of friction of thermoplastic polymers |
| title_full_unstemmed |
Effect of macromolecule orientation on the coeficient of friction of thermoplastic polymers |
| title_sort |
effect of macromolecule orientation on the coeficient of friction of thermoplastic polymers |
| publisher |
Universidade Tecnológica Federal do Paraná |
| publishDate |
2021 |
| citation |
JOHNSON, Nicholas Royden Martingo. Efeito da orientação das macromoléculas no coeficiente de atrito de polímeros termoplásticos. 2019. Trabalho de Conclusão de Curso (Bacharelado em Engenharia Mecânica) - Universidade Tecnológica Federal do Paraná, Curitiba, 2019. |
| url |
http://repositorio.utfpr.edu.br/jspui/handle/1/24018 |
| _version_ |
1805320469628321792 |
| score |
10,814766 |