286
J. Gao et al. / Journal of Fluorine Chemistry 127 (2006) 282–286
dissolved in diethyl ether anhydrous followed by adding 5%
NaOH solution. After phase separation of the mixture the
intermediate (i.e., monomer 3) was extracted in the ester layer,
and then, washed with distilled water to pH 7–8. After
separating, the organic phase was distilled under reduced
pressure to remove diethyl ether, getting 15.8 g monomer 3
(yield 75.2%), they need not be dried further for next emulsion
polymerization. FTIR spectrum of monomer 3 was shown in
Fig. 7 (curve a). The absorption band at 1786 cmꢂ1 was
attributed to caibonyl stretching in the CF2–COO–CH group;
the absorption band at 1729 cmꢂ1 was attributed to carbonyl
stretching in the C–COO–CH2 group; the appearances of C–F
stretching band of 2 at 1240, 1210 and 1150 cmꢂ1 were
observed, respectively. These results are in good consistent with
the data reported by Gu et.al. [16]. Efemental analysis results:
Calcd for C14H9F15O4: C, 31.94; H, 1.71. Found: C, 31.88, H,
1.69.
A series of polymer emulsions has been synthesized with the
same constitution of core, while the fluorine content in polymer
emulsbn was different such as 0, 8, 12 and 18% of fluorine. As
canbe seen from Tables 1 and 2, the more the fluorine content in
polymer emulsion is, the better the chemical resistance,
hydrophobicity and oleophobicity for the polymer film.
Acknowledgments
This work was supported in part by a grant from the Key
Project of Science and Technology of Ministry of Education
(00250), the Project of Excellent Young Teacher of Ministry
of Education (EYTP), the Nature Science Foundatbn of
Gansu Province (3ZS041-A25-028), and the Invention
Project of Science & Technology (KJCXGC-01, NWNU),
China.
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