【摘要】 合成了芘标记单体 N -(芘基 )甲基 -2 -甲基丙烯酰胺 ( Py MA ) ,其与 2 -丙烯酰胺基 -2 -甲基丙磺酸( AMPS)、N,N-二甲基丙烯酰胺 ( DMAA)共聚 ,得到含 Py MA摩尔分数为 0 .1 %、AMPS摩尔分数 FAMPS分别为 0 .0 3 3～ 0 .896的芘标记磺酸基聚电解质 .在 DMSO和水中 ,FAMPS<0 .4 49时芘标记聚电解质的荧光光谱与 Py MA的荧光光谱基本相同 ;当 FAMPS≥ 0 .4 49时 ,芘的 [0 ,1 ]和 [0 ,3 ]跃迁的发射强度大幅度增强 .芘标记的 I1 /I3值随聚电解质电荷密度增加逐渐减小 ,且随聚电解质浓度增加也减小 ,表明聚电解质体系中通过电离基团间吸引形成了分子主链的聚集更多还原

【Abstract】 Pyrenylmethyl methacrylamide(PyMA) was synthesized, and applied to copolymerizing with AMPS and DMAA to get a series of pyrene labeled polymers with sulfonate groups. The molar fraction of sulfonate monomer AMPS in these samples varies from 0.032 6 to 0.896 . In DMSO and water, the profile of fluorescence spectrum of pyrene labeled polyelectrolytes is analogous to that of PyMA when F AMPS < 0.449, while the [0,1] emission peak abruptly increased as F AMPS ≥0.449. The so called polarity scale of pyrene, I 1/ I 3 of pyrene labeled polyelectrolytes in DMSO and in water decreases gradually with increasing F AMPS representing the charge density of the samples. I 1/ I 3 also decreases gradually with the increase in polymer concentration in water. The results imply that there exists the hydrophobic aggregation through locally electrostatic attraction even in polyelectrolyte/polar solvent system, in contrast to the traditional polyelectrolyte theory. However, I 1/ I 3 of these polyelectrolytes remains almost a constant with increasing NaCl concentration of aqueous solution up to 0.75 mol/L, indicating the electrostatic attraction cannot be simply screened. [WT5HZ]更多还原