Estudo das propriedades termofísicas com variação da expansibilidade de compósito desenvolvido com matriz PUR-NOP e carga funcional de argilomineral
In this study were conducted experimental procedures for determination of variation of the expandability of rigid polyurethane foam (PUR) from a natural oil polyol (NOP), specifically the Castor oil plant, Ricinus communis, pure and additions of the vermiculite in phase dispersed in different per...
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| Formato: | doctoralThesis |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/15575 |
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| Resumo: | In this study were conducted experimental procedures for determination of variation of
the expandability of rigid polyurethane foam (PUR) from a natural oil polyol (NOP),
specifically the Castor oil plant, Ricinus communis, pure and additions of the vermiculite in
phase dispersed in different percentage within a range from 0% to 20%, mass replacement.
From the information acquired, were defined the parameters for production of bodies of test,
plates obtained through controlled expansion, with the final volume fixed. Initially, the plates
were subjected to thermal performance tests and evaluated the temperature profiles, to later be
extracted samples duly prepared in accordance with the conditions required for each test. Was
proceeded then the measurement of the coefficient of thermal conductivity, volumetric
capacity heat and thermal diffusivity. The findings values were compared with the
results obtained in the tests of thermal performance, contributing to validation of the same.
Ultimately, it was investigated the influence that changes in physical-chemical structure of the
material had exerted on the variation of thermophysical quantities through gas pycnometry,
scanning electron microscopy (SEM) combined with energy dispersive X-ray fluorescence
spectroscopy (EDXRF), infrared spectroscopy using Fourier transform (FTIR),
thermogravimetric analysis (TGA) and differential thermal analysis (DTA). Based on the
results obtained was possible to demonstrate that all load percentage analyzed promoted an
increase in the potential expansion (PE) of the resin. In production of the plates, the
composites with density near at the free expansion presented high contraction during the cure,
being the of higher density adopted as definitive standard. In the thermal performance tests,
the heating and cooling curves of the different composites had presented symmetry and values
very close for lines of the temperature. The results obtained for the thermophysical properties
of composites, showed little difference in respect of pure foam. The percentage of open pores
and irregularities in the morphology of the composites were proportionate to the increment of
vermiculite. In the interaction between the matrix and dispersed phase, there were no
chemical transformations in the region of interface and new compounds were not generated.
The composites of PUR-NOP and vermiculite presented thermal insulating properties near the
foam pure and percentage significantly less plastic in its composition, to the formulation with
10% of load |
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