Modificação superficial do tecido de malha de ácido polilatico (PLA) por tratamento plasma
Some fibrous materials, for having properties such as biocompatibility, strength and flexibility, are of great interest for medical and pharmaceutical applications. Among these materials, the fabric made from polylactic acid (PLA) has received special attention, and beside to present these features,...
Wedi'i Gadw mewn:
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| Awduron Eraill: | |
| Fformat: | Dissertação |
| Iaith: | por |
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Universidade Federal do Rio Grande do Norte
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| Mynediad Ar-lein: | https://repositorio.ufrn.br/jspui/handle/123456789/15723 |
| Tagiau: |
Ychwanegu Tag
Dim Tagiau, Byddwch y cyntaf i dagio'r cofnod hwn!
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| Crynodeb: | Some fibrous materials, for having properties such as biocompatibility, strength
and flexibility, are of great interest for medical and pharmaceutical applications.
Among these materials, the fabric made from polylactic acid (PLA) has received
special attention, and beside to present these features, is derived from
biological source, antimicrobial and bioabsorbable. One of the limitations of PLA
is its low wettability and capillarity. Due to this, it is necessary to perform
surface modification of the knitted fabric, increasing its hydrophilicity. This work
aims to realize the plasma treatment at low pressure in order to increase the
surface energy of the polymer. The work was divided into three steps: i)
Influence of the gas ratio (oxygen and nitrogen) in the surface modification of
PLA fabric after the plasma treatment, ii) physical characterization and
physicochemical surface tissue; iii) Evaluation of the effect from current and
gas ratio in the capillary rise of tissues and iv) Study of capillarity in yarns and
fabrics. The results showed that better gas ratios were the atmospheres: 100%
oxygen; 100% nitrogen and 50% oxygen and 50% nitrogen. The surface
characterization showed changes in topography and introduction of polar
groups which increased the wettability of the fabric. In another part of this study,
it was found that the atmosphere containing only nitrogen gas showed the most
capillary rise to a current of 0.15 A. The results in capillary yarns and fabrics
showed that the thread reached equilibrium in a time much less than the fabric
to an atmosphere of 100% nitrogen and 0.15 A. Current Plasma technology
was effective to increase the hydrophilicity of PLA fabric, providing surface
characteristics favorable for future application in the biomedical field |
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