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High‐temperature Oxidation of Carborane–Siloxane–Acetylene‐based Polymer
Author(s) -
Pehrsson Pehr E.,
Henderson Leslie J.,
Keller Teddy M.
Publication year - 1996
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/(sici)1096-9918(199603)24:3<145::aid-sia89>3.0.co;2-b
Subject(s) - siloxane , analytical chemistry (journal) , microprobe , x ray photoelectron spectroscopy , argon , silicon , scanning electron microscope , materials science , oxide , auger electron spectroscopy , polymer , silicon oxide , carborane , boron , chemistry , chemical engineering , mineralogy , composite material , silicon nitride , organic chemistry , metallurgy , physics , nuclear physics , engineering
A processable new thermosetting polymer containing carborane and siloxane groups with acetylenic linkages was examined for antioxidative properties during high‐temperature oxygen exposure. Samples of the polymer were annealed in argon or air at 320–400°C or argon at 900°C and oxidized at 400 and 500°C. Their structure and composition were analyzed by scanning electron microscopy, x‐ray photoelectron spectroscopy, scanning Auger microprobe scattering and Raman microprobe scattering. Samples heated to 400°C in argon exhibited little or no inorganic segregation, but developed surface layers of boron and silicon oxide when heated to 400°C in air. Samples annealed in argon to 900°C and then oxidized at 500°C for up to 100 h developed a continuous silicon oxide surface layer with almost no underlying boron oxide. The layer retarded oxidation of the sample bulk at 500°C.