High-temperature elastomers: A systematic series of linear poly(carborane–siloxane)s containing icosahedral (CB10H10C) cages. II. Thermo-oxidative behavior
| Autor: | M. B. Roller, John K. Gillham |
|---|---|
| Rok vydání: | 1973 |
| Předmět: |
chemistry.chemical_classification
Thermogravimetric analysis Materials science Polymers and Plastics Icosahedral symmetry General Chemistry Polymer Elastomer Surfaces Coatings and Films chemistry.chemical_compound chemistry Siloxane Differential thermal analysis Polymer chemistry Materials Chemistry Physical chemistry Molecule Carborane |
| Zdroj: | Journal of Applied Polymer Science. 17:2623-2634 |
| ISSN: | 1097-4628 0021-8995 |
| DOI: | 10.1002/app.1973.070170901 |
| Popis: | A study of oxidative instability versus molecular structure for a systematic series of well-defined linear poly(carborane-siloxane)s is reported. These polymers form the backbone components of the most recently developed high-temperature elastomers. The basic structure is where (1) x = 1, 3, 4, 5, ∞ (2) A = endgroups (reactive and inert); (3) Z = meta-carborane, para-carborane (for x = 3); (4)R = CH3, R = C2H4CF3 (for x = 3), one in five R's = C6H5 with the remainder CH3 (for x = 4); (5) molecular weight = ∼10,000, ∼50,000 (for x = 3). Thermomechanical spectra in air (∼1 cps) from 130°C 625°C 130°C at 3.6°C/min, thermogravimetric data from 25°C 700°C in air (3.6°C/min), and differential thermal analysis data from 25°C ∼450°C in air (15°C/min) are presented. Thermo-oxidative stability is discussed in terms of structure, and broad categories of behavior are defined. |
| Databáze: | OpenAIRE |
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