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用W(CO) 6 催化体系聚合苯乙炔 ,以高产率获得较高相对分子质量的聚苯乙炔。使用UV、IR、GPC等分别对聚苯乙炔结构进行表征。采用不同波长的激发光对聚苯乙炔荧光性能进行了详细研究 ,结果表明 :当聚苯乙炔用 31 0nm激光激发时 ,呈现 3个荧光发光峰 ,峰值分别在348、396和 61 0nm处 ,与其溶液的紫外吸收有类似的光谱曲线特征。荧光峰在 348nm处的荧光 ,当聚苯乙炔质量浓度大于 0 0 5g L时 ,呈现荧光猝灭效应 ;在聚苯乙炔质量浓度为 1 0 - 4g L时 ,呈现出最大的荧光发光量子效率。当激发光波长低于 2 70nm和高于 340nm时 ,348nm波长荧光消失 ;荧光峰在 396nm处的荧光 ,当聚苯乙炔的质量浓度为 1 0 - 2 g L时 ,呈现最大的发光量子效率 ,聚苯乙炔的质量浓度增大或降低 ,其发光强度均呈现减弱现象 ;荧光峰在 61 0nm的荧光 ,在聚苯乙炔质量浓度为 1 0 - 4g L时 ,呈现最大的发光量子效率。荧光性能研究结果证明这种催化剂获得的聚苯乙炔具有多种异构链结构。
Phenylacetylene was synthesized by W (CO) 6 catalysis and high molecular weight polyphenylacetylene was obtained in high yield. Polystyrene structure was characterized by UV, IR and GPC, respectively. The fluorescence of poly (phenylacetylene) was studied in detail using different wavelengths of excitation light. The results showed that when the poly (phenylene vinylene) was excited by 31 0 nm laser, three fluorescence peaks were observed at 348, 396 and 61 0 nm respectively, UV absorption of the solution has similar spectral curve characteristics. Fluorescence peak at 348nm fluorescence, when the concentration of polyphenylacetylene greater than 0 0 5g L, showing a fluorescence quenching effect; in the polystyrene concentration of 1 0 - 4g L, showing the largest fluorescence quantum efficiency. When the wavelength of excitation light is below 2 70nm and above 340nm, the fluorescence at 348nm disappears. The fluorescence peak at 396nm shows the highest luminescence quantum efficiency when the mass concentration of polyphenylacetylene is 10-2g L, The mass concentration of polyphenylacetylene increases or decreases, and its luminescence intensity shows a weakening phenomenon. The fluorescence peak at 61 0nm shows the maximum luminescence quantum efficiency when the mass concentration of polyphenylacetylene is 10-4gL. Fluorescence properties of the results show that the catalyst obtained polyphenylacetylene has a variety of isomeric chain structures.