The benzene ring in polystyrene (PS) absorbs strongly in the ultraviolet region (at 190-200 nm). Butadiene does not absorb in this region. A series of styrene-butadiene copolymers were examined by using UV-vis spectroscopy and the results obtained are summarized in Table 2.9 below. Use this information to determine the composition of the unknown styrene-butadiene copolymer, which records an absorbance value of 0.349 at 195 nm under the same conditions? Table 2.9 UV-vis spectroscopic data obtained for a series of styrene-butadiene copolymers (SAQ 2.8) Styrene content (%) Absorbance at Amax 195 nm 50522 0.103 10 0.205 15 0.308 0.410 0.513