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A new approach to the preparation of PDMS-SiO2 based hybrids - A structural study
- Source :
- Repositório Científico de Acesso Aberto de Portugal, Repositório Científico de Acesso Aberto de Portugal (RCAAP), instacron:RCAAP
- Publication Year :
- 2014
- Publisher :
- ELSEVIER SCIENCE BV, 2014.
-
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.
- Subjects :
- Materials science
Biocompatibility
Oxide
02 engineering and technology
010402 general chemistry
01 natural sciences
chemistry.chemical_compound
Transition metal
Polymer chemistry
General Materials Science
Chelation
Polydimethylsiloxane
Mechanical Engineering
OXIDE
021001 nanoscience & nanotechnology
Condensed Matter Physics
NANOCOMPOSITES
0104 chemical sciences
Characterization (materials science)
chemistry
Chemical engineering
Mechanics of Materials
Ethyl acetoacetate
POLYDIMETHYLSILOXANE
0210 nano-technology
Hybrid material
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Repositório Científico de Acesso Aberto de Portugal, Repositório Científico de Acesso Aberto de Portugal (RCAAP), instacron:RCAAP
- Accession number :
- edsair.doi.dedup.....b79aaf0f7cfdf2a3c1e140b065cd7787