Relaxation behaviour of NLO chromophores grafted in hybrid sol–gel matrices

Autor:	Clément Sanchez, Bénédicte Lebeau, J. Maquet, R. Hierle, E. Toussaere, Joseph Zyss
Rok vydání:	1994
Předmět:	Magic angle Chemistry General Chemistry Nuclear magnetic resonance spectroscopy Chromophore Hydrolysis chemistry.chemical_compound Differential scanning calorimetry Chemical engineering Siloxane Polymer chemistry Materials Chemistry Spinning Sol-gel
Zdroj:	J. Mater. Chem.. 4:1855-1860
ISSN:	1364-5501 0959-9428
DOI:	10.1039/jm9940401855
Popis:	Poled hybrid siloxane–oxide coatings synthesized through hydrolysis and condensation from tetramethoxysilane (TMOS) and N-[3-triethoxysilylpropyl]-2,4-dinitrophenylamine (TSDP) precursors have been characterized via second-harmonic generation (SHG), differential scanning calorimetry (DSG) and 29Si magic-angle spinning nuclear magnetic resonance (MAS NMR) measurements. Depending on chemical composition the SHG values range between 2.5 and 10 pm V–1. The matrix rigidity seems to have a strong influence on the relaxation behaviour of the optically non-linear chromophores grafted in these hybrid networks. The glass-transition temperatures of the hybrid coatings increase with the TMOS content and the thermal curing time. These modifications can be explained by an increase in the condensation and degree of crosslinking of siloxane and silica species.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::33f797f5fca89397c73fb7c1cd81b7b3 https://doi.org/10.1039/jm9940401855 Zobrazit plný text záznamu