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设计合成了手性单体(+)-甲基丙烯酸{2,5-双[4′-((S)-2-甲基丁氧基)苯基]苯基}酯,并进行了自由基溶液聚合.相比于单体,聚合物的比旋光度有显著的同向增长,且在其圆二色光谱上对应于三联苯侧基以及酯基的吸收区域呈现明显的Cotton效应,说明其主链可能采取某一旋向占优的螺旋构象.研究了聚合条件对聚合物旋光性质的影响.结果表明,采用极性大的芳香族溶剂或增加单体浓度有利于获得旋光度大的聚合物;随聚合温度增加,聚合物旋光度先增加后减小,在80℃时聚合达到最大值.该聚合物比甲基丙烯酸三芳基甲基酯类光学活性螺旋链聚合物具有更好的化学结构稳定性和立体结构稳定性.
The chiral monomer (+) - {2,5-bis [4 ’- ((S) -2-methylbutoxy) phenyl] phenyl} methacrylate was designed and synthesized. Solution polymerization.Compared with the monomer, the polymer has a significant increase in specific rotation, and in its circular dichroism spectrum corresponds to the terphenyl side groups and the absorption area of the ester group showed significant Cotton effect, indicating that the The main chain may take a spin-dominated helical conformation. The effect of polymerization conditions on the optical properties of the polymer was investigated. The results show that the use of a large aromatic solvent or increase the monomer concentration is conducive to obtain a large optical rotation of the polymerization As the polymerization temperature increases, the optical rotation of the polymer first increases and then decreases, reaching the maximum at 80 ° C. The polymer has better chemical activity than the triarylmethyl methacrylate optically active helical chain polymer Structural stability and three-dimensional structural stability.