Department of Polymer Science, Kyungpook National University, #1370 Sangyuk-dong, Buk-gu, Daegu 702-701, Korea.
Langmuir. 2009 Dec 1;25(23):13426-31. doi: 10.1021/la902346u.
The effects of Disperse Red 1 (DR1) in the poly(styrene-block-4-vinylpyridine) (PS-b-P4VP) micelle on micellar morphology and fluorescence emission were studied using small-angle X-ray scattering (SAXS), generalized indirect Fourier transform (GIFT), Fourier transform infrared (FT-IR), transmission electron microscopy (TEM), and photoluminescence (PL). PS-b-P4VP was coupled with DR1 in 10 mg/mL toluene/ethanol mixture solutions where ethanol and toluene were P4VP and PS selective, respectively. Hydrogen bonds were formed between the -OH group of DR1 and the pyridine ring in PS-b-P4VP. DR1 (which was coupled with P4VP) was confined in the core or corona of the micelle depending on the location of P4VP. The micellar structure was strongly dependent on varphi (weight percentage of toluene in a toluene/ethanol mixture). The PS-b-P4VP-DR1 complex in the mixture solutions showed the spherical micelle with the cores of P4VP and PS in ethanol-rich and toluene-rich solvents, respectively. The quenching phenomenon was observed for DR1 in the corona of PS-b-P4VP micelles [at varphi = 0 (ethanol)], while the fluorescence quantum yield decreased. However, significant increases in the fluorescence quantum yields at varphi = 100 were observed when DR1 was confined in the core of the PS-b-P4VP micelles. The confinement of DR1 in the hard core was more effective in fluorescence emission than that in the soft corona due to the slow trans-to-cis transition of DR1.
用小角 X 射线散射（SAXS）、广义间接傅里叶变换（GIFT）、傅里叶变换红外（FT-IR）、透射电子显微镜（TEM）和光致发光（PL）研究了Disperse Red 1（DR1）在聚（苯乙烯嵌段-4-乙烯基吡啶）（PS-b-P4VP）胶束中的作用对胶束形态和荧光发射的影响。PS-b-P4VP 与 10mg/mL 的甲苯/乙醇混合溶液中的 DR1 偶联，其中乙醇和甲苯分别是 P4VP 和 PS 的选择性溶剂。DR1 的-OH 基团与 PS-b-P4VP 中的吡啶环形成氢键。DR1（与 P4VP 偶联）取决于 P4VP 的位置，被限制在胶束的核或冠区。胶束结构强烈依赖于 varphi（甲苯/乙醇混合物中甲苯的重量百分比）。混合溶液中的 PS-b-P4VP-DR1 复合物在富乙醇和富甲苯溶剂中分别表现出具有 P4VP 和 PS 核的球形胶束。在 corona 中观察到 DR1 的猝灭现象 PS-b-P4VP 胶束[在 varphi = 0（乙醇）]，同时荧光量子产率降低。然而，当 DR1 被限制在 PS-b-P4VP 胶束的核中时，在 varphi = 100 时观察到荧光量子产率显著增加。由于 DR1 的缓慢反式-顺式转变，DR1 在硬核中的限制比在软 corona 中更有效地促进荧光发射。
