Synthesis and Characterization of a New Polyester Having Photo-crosslinkable Cinnamoyl Group

Photosensitive polymers with photo-crosslinkable groups have gained a considerable interest in recent years owing to a wide variety of applications in the field of potoresists, photocurable coatings, microlithography, nonlinear optics, energy exchange materials, photosensitizers, etc.1-6 Among various photo-crosslinkable groups, α,β-unsaturated carbonyl unit known as cinnamoyl group have attracted particular attention due to its excellent photoreactivity at UV absorp-tion wavelength.7-11 Here, cinnamoyl group either in the back-bone or side chain of the polymer can easily be produced by crosslinking reaction through [2pi+2pi] cycloaddition of the carbon-carbon double bond upon irradiation with UV light.12-14 In this paper, we report the synthesis and characterization of a new photo-crosslinkable aromatic polyester with cinnamoyl group onto polymer backbone