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Polymers with Pendant Furan Groups

المؤلف:  A. Ravve

المصدر:  Principles of Polymer Chemistry

الجزء والصفحة:  p745-746

2026-03-08

336

Polymers with Pendant Furan Groups

Tsuda [160] attached 2-furylacrolein to a polymeric backbone by the following reaction:

In the presence of photosensitizers, this polymer was found by Tsuda to cross-link at a considerably faster rate than does poly (vinyl cinnamate) [160]. He showed that the cross-linking reaction also results in formation of cyclobutane derivatives. The cross-linking is illustrated on 3-furfurylacrylic ester:

Tajima, Arai, and Takeuchi [161–163] studied the effects of singlet oxygen on photocross-linking of poly (furfuryl methacrylate). The singlet oxygen was generated by fullerene C60. The reactions were carried out in 1,1,2,2-tetra-chloroethane solutions that contained the polymer and fullerene C60. Gelation occurs when exposed to visible light in the presence of photosensitizers. These solutions gel after several hours and subsequently solidify completely [163]. It is interesting to note that fullerines are also effective in causing sensitization of poly (furfuryl methacrylate) and are effective in causing cross-linking upon with UV irradiation [164]. This is attributed to their long-lasting ability to sensitize oxygen even when they themselves undergo oxidation The sensitivity of poly (furfuryl methacrylate) increases linearly when the concentration of C₆₀ is increased from 5 x 10^-5 to I x 10^-3 mol/L. Saturation of sensitivity in the high C60 concentration regions was observed to be due to deficiency of oxygen molecules in the resist films. It was concluded that the dissolution rate of oxygen from the atmosphere into the resist film is lower than its consumption rate [164]. Preparation of photocross-linkable furan-containing polyimides was also reported [165]. It was also found that the polymer cross-links with the aid of singlet oxygen. Formations of fine pattern images can be formed. This was taken as clear evidence of the successful photolithography in this photo-curable system that uses C60 as the photosensitizer [165].