二茂铁表面活性剂在聚丙烯腈基炭纤维表面的可逆修饰

Reversible surface modification of PAN-based carbon fibers by a ferrocene-based surfactant

  • 摘要: 采用电化学可逆表面活性剂(二茂铁)十二烷基二甲基溴化铵(FDDA)对炭纤维进行表面改性。结果表明,FDDA能够在炭纤维表面进行吸附及电化学脱附,实现可逆的表面改性。同时证实了FDDA主要通过非静电相互作用在炭纤维表面以多分子层的方式进行吸附。此外,通过单丝拉伸断裂法探究了FDDA改性炭纤维对炭纤维/环氧树脂界面性能的影响。与未改性的炭纤维相比,FDDA改性的炭纤维与环氧树脂之间的界面黏结性能得到明显改善。

     

    Abstract: The surface of carbon fibers (CFs) was modified by a surfactant (ferrocenemethyl)dodecyldimethylammonium bromide (FDDA) to enhance the interfacial ashesion between the CFs and surrounding matrix. Results showed that it could be electrochemically desorbed by a potentiostatic electro-oxidation method. The FDDA adsorption isotherm was attributed to the formation of multi-molecular layers mainly by non-electrostatic interactions. The adsorption and desorption of FDDA on the CFs have little effect on their tensile strength. The effects of FDDA modification on the interfacial properties of CF/epoxy composites were evaluated by a single-filament fragmentation test. Compared with the un-modified CFs, the FDDA-modified ones had significantly improved interfacial adhesion properties in the composites. This method provides a potential approach for preparing recyclable CF/resin composites.

     

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