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UV absorbance spectra of PGS-CinA thin film. Cinnamate groups in thin films of PGS-CinA (DS35%) reveal a strong absorbance peak at 273 nm. The intensity of this peak decreases upon crosslinking via [2+2] photodimerization under UV irradiation. The intensity decreases 90% from the initial state after 30 minutes of irradiation.
