An Investigation into the Migration of Segments in Crosslinked Fluorinated Polyimide Adhesive |
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| Authors: | Zhongyuan Huang Renguo Lu Ting Huang Hongyan Wang Tongsheng Li |
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| Institution: | Department of Macromolecular Science, State Key Laboratory of Molecular Engineering of Polymers , Fudan University , Shanghai China |
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| Abstract: | Crosslinked fluorinated polyimides (CFPI) were successfully synthesized to study and explore the effect of cross-linkage on the migration of fluorinated segments and on the adhesion strength. Characterization by dynamic thermomechanical analysis (DMA) and thermo gravimetric analysis (TGA) confirmed good thermal properties of CFPI. X-ray photoelectron spectroscopy (XPS) results showed that the ratio of fluorinated component (6FDA-ODA) concentration of the surface to the bulk decreased with the crosslink density. The water contact angle of CFPI was lower than that of non-crosslinked fluorinated polyimide, indicating that the migration of fluorinated groups to the surface was reduced by the presence of cross-linkage. Therefore, CFPI, with no fluorine segregation on the surface, exhibited excellent wetting of adherent surfaces and adhesion strength, which was proved by lap shear strength (LSS) measurements and scanning electron microscopy. |
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| Keywords: | crosslink fluorinated polyimide failure mode fluorine segregation lap shear strength phenylethynyl termination agent |
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