| 摘要 |
<p>The invention concerns the synthesis of novel fluorinated elastomers having very low glass transition temperatures (Tg), good resistance to bases, oil and fuels and suitable properties in use. Said elastomers contain, for example, 80 to 60 mol % of vinylidene fluoride (VDF) and 20 to 40 mol % perfluoro(4-methyl-3,6-dioxaoct-7-ene) sulphonyl perfluoride (PFSO2F). In that particular case, they are prepared by free radical copolymerisation of VDF and PFSO2F in the presence of different organic initiators, for example, peroxides, peresters or diazonium compounds.</p> |
