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Static Contact Angles
Static contact angles of water dripped onto the surface of
the polyimide films were tested to investigate the hydropho-
bic character of PIs film surfaces and the measured contact
angle values were in the range of 91.97ꢀ–107.03ꢀ. The water
contact angles (hW) of the PI films are listed in Table 3. Fig-
ure 7 depicts the profiles of a droplet on the PI surface. PI2
and PI4 displayed higher hW values, 97.37ꢀ and 107.03ꢀ,
respectively, therefore better hydrophobic characteristics,
compared to PI1 and PI3 (91.97ꢀ and 93.73ꢀ, respectively).
The results indicate that the presence of hydrophobic tri-
fluoromethyl group of 6FDA and perfluorodecylthio group of
DAPFB/BPFBD in the polyimide backbone of PI2 and PI4
could efficiently lead to the migration of the fluorocarbon
chain segments to the film surface and thereby fluorine
enrichment at the surface, thus reducing the surface tension
and making the surface more hydrophobic.34
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CONCLUSIONS
The efficient synthesis of two new perfluorodecylthio substi-
tuted aromatic diamines DAPFB and BPFBD was reported in
this work. Both DAPFB and BPFBD were reactive enough to
yield two new perfluorinated aromatic polyimides (PI2 and
PI4) by the polycondensation with 6FDA. A comparative
investigation between the perfluorinated PIs (PI2 and PI4)
and nonperfluorinated PIs (PI1 and PI3) revealed that PI2
and PI4 exhibited higher solubility and optical transparency,
but lower thermal and mechanical properties due to the
presence of bulky, electron withdrawing perfluorodecylthio
side group which lowers cohesive energy and reduces CTC
formation and interchain packing density. The much higher
concentration of hydrophobic fluorinated substituents in PI2
and PI4 increases their hydrophobicity and decreases mois-
ture absorption and dielectric constant. The eminent combi-
nation of several properties guaranteed PI2 and PI4 as
potential candidates for high-performance microelectronic
applications.
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ACKNOWLEDGMENTS
5858–5860.
The work was supported by the National Research Foundation
of Korea (NRF). Grant funded by the Ministry of Science, ICT,
Future planning, Korea, Pioneer Research Center Program (No.
2010-0019308/2010-0019482), and the Brain Korea 21 Plus
Program (21A2013800002).
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2010, 46, 1878–1890.
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