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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Stathi, K. Tarantili, P. A. Polyzois, G. |
| Description | Country affiliation: Greece Author Affiliation: Stathi K ( Polymer Technology Laboratory, School of Chemical Engineering, National Technical University of Athens, Heroon Polytechniou 9, Zographou, 15780, Athens, Greece.) |
| Abstract | The UV-protection provided to addition type silicone elastomers by various colorants, such as conventional dry earth pigments, as well as the so called 'functional or reactive' pigments, was investigated. Moreover, the effect of a UV light absorber and a silica filler was also explored. Under the experimental parameters of this work, the exposure of silicone to UV radiation resulted in some changes of the IR absorbance, thermal decomposition after 400 degrees C, T(g) and tensile properties, whereas the storage modulus of samples was not affected. The obtained spectroscopic data, as well as the results of TGA and storage modulus, were interpreted by assuming that chain scission takes place during aging, whereas the improvement of tensile strength allows the hypothesis of a post-curing process, initiated by UV radiation. Therefore, the increase of T(g) could partly be due to the above reason and, furthermore, to the contribution of a rearrangement of chain fragments within the free volume of the elastomeric material. Regarding the evaluation of various coloring agents used in this work, the obtained results show that dry pigments are more sensitive to accelerated ageing conditions in comparison with functional liquid pigments. Moreover, the hydrophobic character of silicone matrix is enhanced, with the addition of this type pigments because of the vinyl functional silanes groups present in their chemical structure. Finally, it should be noted that the incorporation of silica nanofiller did not seem to prevent the silicone elastomer from degradation upon UV irradiation, but showed a significant reinforcing effect. |
| File Format | HTM / HTML |
| ISSN | 09574530 |
| Issue Number | 5 |
| Volume Number | 21 |
| e-ISSN | 15734838 |
| Journal | Journal of Materials Science: Materials in Medicine |
| Language | English |
| Publisher | Springer |
| Publisher Date | 2010-05-01 |
| Publisher Place | United States |
| Access Restriction | Subscribed |
| Subject Keyword | Discipline Biomedical Engineering Biocompatible Materials Chemistry Silicone Elastomers Coloring Agents Elasticity Silicones Tensile Strength Ultraviolet Rays Journal Article |
| Content Type | Text |
| Resource Type | Article |
| Subject | Biomaterials Biophysics Bioengineering Biomedical Engineering |
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