High-temperature elastomers: A systematic series of linear poly(carborane-siloxane)s containing icosahedral (CB10H10C) cages. I. Thermomechanical behavior in nitrogen
| Autor: | John K. Gillham, M. B. Roller |
|---|---|
| Rok vydání: | 1973 |
| Předmět: |
chemistry.chemical_classification
Thermogravimetric analysis Materials science Polymers and Plastics General Chemistry Polymer Elastomer Surfaces Coatings and Films Crystallography chemistry.chemical_compound chemistry Differential thermal analysis Siloxane Polymer chemistry Materials Chemistry Carborane Molecule Thermal stability |
| Zdroj: | Journal of Applied Polymer Science. 17:2141-2172 |
| ISSN: | 1097-4628 0021-8995 |
| DOI: | 10.1002/app.1973.070170715 |
| Popis: | An extensive study of structure–bulk property relations 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-, para-carborane (for x = 3); (4) R = CH3, R = C2H4CF3 (for x = 3), one in five R = C6H5 with the remainder ∼CH3 (for x = 4, randomly and regularly substituted); (5) molecular weight = ∼10,000, ∼50,000 (for x = 3). Thermomechanical spectra (∼1 cps) from −180°C to 625°C to −180°C in nitrogen at 3.6°C/min and thermogravimetric data from 25°C to 800°C in argon are presented. Physical transitions (Tg, Tm, Tcrys, Tsec) are discussed, including a correlation of Tg data with structure (for x = 1, 2, 3, 4, 5, ∞) using a copolymer equation. Thermostability is also discussed in terms of structure. |
| Databáze: | OpenAIRE |
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