Título: | HDPE CHARACTERIZATION BEFORE AND AFTER AGING IN DIFFERENT CONDITIONS AND MEDIUM | ||||||||||||||||||||||||||||||||||||||||
Autor: |
ANDRES FELIPE CRUZ BECERRA |
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Colaborador(es): |
JOSE ROBERTO MORAES D ALMEIDA - Orientador |
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Catalogação: | 19/ABR/2016 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||||||||||||||||||||||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=26152&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=26152&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.26152 | ||||||||||||||||||||||||||||||||||||||||
Resumo: | |||||||||||||||||||||||||||||||||||||||||
The interest of this work was based on the study of the influence of different
aging conditions and medium in mechanical, thermal, structural and chemical
properties of high-density polyethylene (HDPE) used for the manufacture of line
pipes for transporting oil and gas. Prototypes for type-V tensile testing according
to ASTM D 638. For development this work, the samples were submitted to
different types of aging in different medium, namely: i) UV irradiation with a
radiant energy with 365 nm of wavelengths and exposure times of 8, 12 and 18
weeks; ii) For aging under temperature, the samples were immersed in three
different types of lubricating oil, to 50, 70 and 90 celsius degree for periods of 2, 3, 4 and 6
months; iii) aging under pressure, where the samples were submitted to 7, 14 and
17 bar and immersed in ordinary water at 50 celsius degree for 1 and 2 weeks and pattern Oil
BASIC B 440-70 celsius degree for 1, 2 and 5 weeks. The aged samples was characterized
by X-ray diffraction, infrared spectroscopy, Raman spectroscopy, differential
scanning calorimetric, thermal gravimetric analysis, tensile and creep tests, melt
flow rate, scanning electron microscopy and optical microscopy. The results of the
characterization of the samples after aging were compared with the results
obtained from virgin HDPE, whose properties were obtained using the same
characterization methods. Besides, was evaluated, the viscoelastic behavior of the
HDPE, by mathematical simulation of viscoelastic models, based on experimental
results of creep tests before and after aging. The results showed that mechanical
behavior of HDPE after aging was strongly influenced by different variables, such
as temperature, pressure, medium and exposure time. Since the sum of each effect
generated by each parameter contributes to the variation of the mechanical
performance of the polymer. Whichever the external variable imposed on HDPE -
temperature, time, pressure, or exposure medium - always leads to changes in
mechanical properties. However, depending on which of the parameters
mentioned above is predominant, the aging HDPE will be more or less relevant.
Simulating the creep behavior, the four parameters model was the one who
presented the best graphic and mathematical description approximation of the
experimental behavior.
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