Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/19879
Title: | A new approach to the preparation of PDMS-SiO2 based hybrids - A structural study |
Author: | Carlos Almeida, J. Castro, Antonio G. B. Miranda Salvado, Isabel M. Margaca, Fernanda M. A. Helena Vaz Fernandes, M. |
Keywords: | POLYDIMETHYLSILOXANE NANOCOMPOSITES OXIDE |
Issue Date: | 2014 |
Publisher: | ELSEVIER SCIENCE BV |
Abstract: | Due to its elasticity, transparency and biocompatibility, polydimethylsiloxane (PDMS) has been used as an organic component of hybrid materials in different fields of application such as photonics or biomaterials. Typically an acidic medium is used in the sol-gel processing of PDMS-metal oxide systems due to its catalytic effect. Furthermore, when dealing with highly reactive transition metal alkoxides, a chelating agent is pointed out as being necessary to avoid phase separation. In this work a new approach to the preparation procedure of hybrid materials, based on the system PDMS-SiO2-MO2 with M=Ti or Zr, was used. Samples were prepared at different pH values, without water addition and in the presence or absence of a chelating agent (ethyl acetoacetate). All samples were homogeneous and transparent even at high pH. ATR-IR, Si-29-NMR MAS and Si-29-{H-1} CP-MAS were used for the characterization of the obtained samples. According to the 29Si-{H-1} CP-MAS results some differences in the nature of difunctional D ((CH3)(2)center dot SiO2) and tetrafunctional (SiO4) Q structural units were observed. The presence of Ti-O-Si and Zr-O-Si bonds was confirmed by ATR-IR analysis. (C) 2014 Elsevier B.V. All rights reserved. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/19879 |
DOI: | 10.1016/j.matlet.2014.04.135 |
ISSN: | 0167-577X |
Publisher Version: | 10.1016/j.matlet.2014.04.135 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
A new approach to the preparation of PDMS-SiO2 based hybrids - A structural study_10.1016j.matlet.2014.04.135.pdf | 936.23 kB | Adobe PDF |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.