By means of a platinum-catalyzed hydrosilylation reaction

2

2

3

4

4

4-hexafluorobutyl methacrylate(HFMA) and allyl glycidyl ether(AGE) in different proportions were used to react with polymethylhydrosiloxane(PMHS) in turn

then with different fluorine contents

three kinds of cationic UV-curable polysiloxanes containing fluorinated/epoxy side groups(EFPS) were obtained.Their chemical structures were characterized by FTIR

1H-NMR and 13C-NMR.By respectively mixing the three synthesized polysiloxanes with a selected UV-curable epoxy resin(E51)

a series of cured composite films were prepared via cationic photopolymerization under UV irradiation.The thermal stability

surface energy and water resistance property of these cured composite films were analyzed by means of TGA

surface contact angle test and water absorption ratio test.The results indicated that after the introduction of the cationic UV-curable epoxy groups into the side chains of PMHS

the obtained EFPS had more crosslinkable groups

leading to relatively high crosslink degree between the EFPS and the selected epoxy resin.When a quantity of the EFPS was added into epoxy resin matrix

in the presence of fluorine and silicon

the temperature values of the 5% mass loss(T5%) and the 50% mass loss(T50%) of the cured composite films increased to 337.7℃ and 463.6℃

respectively

and their residual weight at 600℃ increased to 25.6%.The calculated surface energy values of the cured films decreased from 44.1 mJ/m2 to 15.3 mJ/m2

and the water absorption ratios were lower than 0.5%.By scanning electron microscopy measurements

the cross-section morphology of the cured composite films showed that the EFPS and the selected epoxy resin was compatible.