Chemistry of fluorocarbon elastomers
| Autor: | Anestis Leonidas Logothetis |
|---|---|
| Rok vydání: | 1989 |
| Předmět: |
chemistry.chemical_classification
Materials science Polymers and Plastics Polymer science Organic Chemistry Surfaces and Interfaces Polymer Elastomer chemistry.chemical_compound Natural rubber chemistry visual_art Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Copolymer Fluoroelastomer Organic chemistry Tetrafluoroethylene Hexafluoropropylene Curing (chemistry) |
| Zdroj: | Progress in Polymer Science. 14:251-296 |
| ISSN: | 0079-6700 |
| DOI: | 10.1016/0079-6700(89)90003-8 |
| Popis: | Fluorocarbon elastomers represent a broad class of high performance elastomers which combine excellent thermal, oxidative and fluid resistance with very good tensile and compression-set resistance properties. These polymers are characterized by having carbon-carbon bonds in the backbone and a considerable amount of fluorine (50–73 wt%). They are made by using different combinations of some of the same fluoroolefin monomers. The commercially important types are classified into three categories: 1. (a) Random copolymers of vinylidene fluoride with perfluorooelfins such as hexafluoropropylene, tetrafluoroethylene, and perfluoroalkyl vinyl ethers. Cure site monomers may also be incorporated. 2. (b) Copolymers of tetrafluoroethylene and propylene (in about equal molar amounts) which have mostly an alternating structure. Cure site monomers may also be incorporated. 3. (c) Copolymers of tetrafluoroethylene with perfluoroalkyl vinyl ethers. Cure sites are imperative for curing these highly inert materials. Curing chemistry suitable for each composition has been developed. The polymer structure is very important in determining the physical properties of an elastomer. However, the crosslinking chemistry used in curing determines to a great extent the properties of the final rubber part. Because of their excellent properties these polymers are being increasingly used in applications where no other material is suitable. In spite of their higher costs, fluoroelastomer uses are expected to keep growing in volume at an estimated rate of 10% per year. Most of the current research effort is aimed towards improving the processability of the polymers and the properties of the resulting rubber parts. It is expected that new polymeric compositions and new curing chemistry will appear in the future. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|