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端硅烷基液体氟弹性体的合成与固化及性能

DOI: 10.3724/SP.J.1105.2013.13085, PP. 1430-1437

Keywords: 端硅烷氟弹性体,端羧基氟弹性体,端五氟苯酚酯氟弹性体,固化,物化性能

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Abstract:

用两步法合成了端硅烷基液体氟弹性体(1)以端羧基液体氟弹性体和五氟苯酚为原料,通过Steglich反应制备了端五氟苯酚酯液体氟弹性体;(2)端五氟苯酚酯液体氟弹性体与γ-氨丙基三乙氧基硅烷发生取代反应,制备端硅烷基液体氟弹性体.用FTIR,1H-NMR,19F-NMR和GPC对端羧基液体氟弹性体、端五氟苯酚酯液体氟弹性体和端硅烷基液体氟弹性体的化学结构进行了表征.端硅烷基液体氟弹性体可在室温下进行湿度固化,固化膜的Tg随着固化前硅烷封端液体氟弹性体相对分子质量的增加而降低.固化膜具有很好的耐酸,航空煤油,非极性溶剂等化学药品性,且高分子量的固化膜的耐航空煤油,环己烷,盐酸性能优于低分子量的固化膜.固化膜具有较好的疏水疏油性,与水的接触角为91°~114°,与丙三醇的接触角为89°~111°.固化膜具有较好的耐热性能,5%热失重温度T5在215~280℃,800℃的残炭率为23.44%~38.69%.

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