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Photocontrol of the refractive index of poly(methyl methacrylate) with a nitrone additive

机译：硝酮添加剂对聚甲基丙烯酸甲酯折射率的光控

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Hydroxy-substituted aromatic nitrone derivatives were used for the photochemical control. of the refractive index of poly(methyl methacrylate) (PMMA) films. Upon irradiation with 366-nm light in solution, these derivatives underwent rearrangement reactions, which eventually produced N,N-diarylformamide derivatives in quantitative yields. Similar photoreactions of the aromatic nitrones in the PMMA films lowered the refractive index of the films by as much as 0.014. The magnitude of the observed refractive-index change was enough for hydroxy-substituted nitrones to be used as additives for the fabrication of graded-index-type polymer optical fibers. In addition, the refractive index of the PMMA films remained almost constant at any conversion of the starting nitrone derivatives for at least 70 days at room temperature. (C) 2004 Wiley Periodicals, Inc.
机译：羟基取代的芳族硝酮衍生物用于光化学控制。 （甲基丙烯酸甲酯）（PMMA）薄膜的折射率在溶液中以366 nm光照射后，这些衍生物进行了重排反应，最终以定量收率产生了N，N-二芳基甲酰胺衍生物。 PMMA薄膜中芳香族硝基的类似光反应将薄膜的折射率降低了0.014。观察到的折射率变化的幅度足以使羟基取代的硝酮用作制造渐变折射率型聚合物光纤的添加剂。另外，在室温下，至少在起始硝酮衍生物的任何转化下，PMMA膜的折射率几乎保持恒定至少70天。 （C）2004年Wiley Periodicals，Inc.

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