| 초록 |
Phenylethynyl-terminated polyimide (LaRC PETI-5) have had considerable attention in airraft and electrical applications due to many practical advantages such as a potential material for coating, adhesives, films, and composite matrix resins. Expandable graphite, which is composed of natural graphite flake with high aspect ratio and intercalate, can be expanded up to dozens or hundreds times of its pristine volume at high temperature, along the c axis of graphene layers. This unique phenomenon results in a puffed-up material with low density and probably makes intercalation or exfoliation accessible for polymer nanocomposites. Expanded graphite was thermally prepared around 600℃ and finely pulverized using ultrasonic and ball-milling techniques. Graphite nanofiber, which is prepared by CVD method and commercially supplied, is of the aspect ratio of 3000-4000 and a straight structure type. In this work, thermosetting phenylethynyl-terminated polyimide films filled with expanded graphite and graphite nanofiber with 1.0 wt% content were prepared, respectively. The films were extensively characterized by using analytical methods such as x-ray diffraction, transmission electron microscopy, themomechanical analysis, thermogravimetric analysis, and tensile testing. The preliminary result will suggest some potential of the film in polymer applications.
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