Please use this identifier to cite or link to this item:
http://dspace.mediu.edu.my:8181/xmlui/handle/10261/4760Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.creator | Rubio Alonso, Juan | - |
| dc.creator | Oteo Mazo, José Luis | - |
| dc.creator | Velasco, M. José | - |
| dc.date | 2008-06-03T10:31:01Z | - |
| dc.date | 2008-06-03T10:31:01Z | - |
| dc.date | 2008-01 | - |
| dc.date.accessioned | 2017-01-31T01:33:08Z | - |
| dc.date.available | 2017-01-31T01:33:08Z | - |
| dc.identifier | Boletín de la Sociedad Española de Cerámica y Vidrio 40(1): 37-42 (2001) | - |
| dc.identifier | 0366-3175 | - |
| dc.identifier | http://hdl.handle.net/10261/4760 | - |
| dc.identifier.uri | http://dspace.mediu.edu.my:8181/xmlui/handle/10261/4760 | - |
| dc.description | [ES] En este trabajo se ha estudiado mediante Espectroscop a Infrarroja por transformada de Fourier la influencia del peso molecular de pol meros org nicos (PDMS) en la velocidad de hidr lisis y policondensaci n de Tetraetilortosilicato (TEOS) en medio acuoso cido. La evoluci n de las bandas situadas a 880, 1180 y 850 cm- 1 permite estudiar los procesos de hidr lisis, autocondensaci n y copolimerizaci n respectivamente. La velocidad de hidr lisis y la autocondensaci n de TEOS no se afecta por la presencia de pol mero. Sin embargo la reacci n de copolimerizaci n TEOS-PDMS disminuye al aumentar el peso molecular del pol mero lo que es debido a diferencias en la concentraci n de grupos -OH de final de cadena del pol mero y a la viscosidad de dichos pol meros. Los materiales obtenidos a partir de PDMS de alto peso molecular (18000 y 26000 g/mol) presentan tiempos de gelificaci n an logos al TEOS hidrolizado, mientras que los tiempos de gelificaci n disminuyen cuando se emplean polimeros de menor peso molecular (550 y 1700 g/mol). Este trabajo muestra que la Espectroscop a Infrarroja es una buena t cnica para el seguimiento de las reacciones que ocurren en el proceso sol-gel. | - |
| dc.description | [EN] In this work, we have studied, by FT-IR Spectroscopy, the influence of the molecular weight of organic polymers (polydimethylsiloxane, PDMS) in the hydrolysis and polycondensation reactions of tetraethylortosilicate (TEOS) in acid medium. Following of the bands located at 880, 1180 and 850 cm- 1, the hydrolysis and selfcondensation of TEOS process and copolymerization between TEOS and PDMS respectively can be studied. The rates of hydrolysis and self-condensation of TEOS are not affected by the presence of the polymer. However , the reaction of copolymerization between TEOS and PDMS decreases when the molecular weight of polymer increase, and this is due to both the diferences in the concentration of silanol end groups of polymer and polymer viscosity. The materials obtained from high molecular weight (18000 and 26000 g/mol) have gelification times as TEOS. On the other hand the gelification time decreases when polymers of lower molecular weight ( 550 and 1700 g/mol) are used. This work shows that FT-IR Spectroscopy can be applied to investigate the sol-gel reactions. | - |
| dc.description | Peer reviewed | - |
| dc.format | 440525 bytes | - |
| dc.format | application/pdf | - |
| dc.language | spa | - |
| dc.publisher | Sociedad Española de Cerámica y Vidrio | - |
| dc.relation | http://boletines.secv.es/es/index.php?id=48&vol=40 | - |
| dc.rights | openAccess | - |
| dc.subject | Ormosil | - |
| dc.subject | TEOS | - |
| dc.subject | PDMS | - |
| dc.subject | Hidrólisis | - |
| dc.subject | Policondensación | - |
| dc.subject | FT-IR | - |
| dc.subject | Hydrolysis | - |
| dc.subject | Polycondensation | - |
| dc.title | Estudio por espectroscopía infrarroja de la reacción de hidrólisis y policondensación del IEOS en presencia de PDMS | - |
| dc.title | Study by FT-IR Spectroscopy of the reaction of hydrolysis and polycondensation of TEOS in presence of PDMS | - |
| dc.type | Artículo | - |
| Appears in Collections: | Digital Csic | |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
