Photo-oxidation of polydimethylsiloxane oils: Part I—Effect of silicon hydride groups

Autor:	Yaël Israëli, Jacques Lacoste, Jean-Louis Philippart, Jacques Cavezzan, J. Lemaire
Rok vydání:	1992
Předmět:	Polymers and Plastics Silicon Polydimethylsiloxane Chemistry Hydride Kinetics chemistry.chemical_element Condensed Matter Physics Photochemistry Condensation reaction Oxygen Silicone oil chemistry.chemical_compound Mechanics of Materials Polymer chemistry Materials Chemistry Stoichiometry
Zdroj:	Polymer Degradation and Stability. 36:179-185
ISSN:	0141-3910
DOI:	10.1016/0141-3910(92)90155-x
Popis:	Photo-oxidations at wavelengths longer than 300 nm of polydimethylsiloxane (PDMS) oil with various contents of SiH and different configurations (H inside the chain (2·2 H equivalent kg−1) or at the end of the chain (1·2–4 and 15 H equivalent kg−1)) have been examined. Hydroperoxides groups are primarily formed on photo-oxidation and result from radical attack on the SiH bond. These photo-unstable and thermally unstable hydroperoxides are transformed essentially into silanols, absorbing at 3300 cm−1. Oxygen consumption measurements suggest a 1 1 stoichiometry between SiH and oxygen consumed, whereas the quantitative determination of SiOH reveals a deficit, mainly as a result of a condensation reaction which leads to a significant increase in viscosity.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a52c159e13424e9d12d814b5f66bdee4 https://doi.org/10.1016/0141-3910(92)90155-x Zobrazit plný text záznamu