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含氟偶氮苯光响应性聚合物的合成及性能 被引量:1
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作者 李向亮 唐倩 +3 位作者 郭聪聪 马荣 常文斌 龚成斌 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2011年第11期2706-2710,共5页
以1,2,3,4,5-五氟苯胺为原料,FeSO4.7H2O负载的KMnO4为氧化剂,制得全氟代偶氮苯,在KOH作用下醇解,进行丙烯酰化反应,得到光响应性的功能单体4-甲基丙烯酰氧基九氟偶氮苯,用GC-MS、元素分析及NMR等方法对功能单体进行表征,并研究了其光... 以1,2,3,4,5-五氟苯胺为原料,FeSO4.7H2O负载的KMnO4为氧化剂,制得全氟代偶氮苯,在KOH作用下醇解,进行丙烯酰化反应,得到光响应性的功能单体4-甲基丙烯酰氧基九氟偶氮苯,用GC-MS、元素分析及NMR等方法对功能单体进行表征,并研究了其光异构化性能.以4-甲基丙烯酰氧基九氟偶氮苯(MANFAB)为功能单体,与十字交联剂三羟甲基丙烷三甲基丙烯酸酯(TRIM)在自由基引发下合成了光响应性的三维交联聚合物,并研究了其光响应性质. 展开更多
关键词 全氟代偶氮苯 4-甲基丙烯酰氧基九氟偶氮苯 光刺激响应聚合物
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Kinetics of Coil-to-Globule Transition of DansyI-Labeled Poly(N-isopropyl- acrylamide) Chains in Aqueous Solution
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作者 李春亮 叶晓东 +1 位作者 丁延伟 刘世林 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2012年第4期389-397,I0003,共10页
The coil-to-globule transition of thermally sensitive linear poly(N-isopropylacrylamide) (PNIPAM) labeled with dansyl group is induced by 1.54 μm laser pulses (widths10 ns). The dansyl group is used to follow t... The coil-to-globule transition of thermally sensitive linear poly(N-isopropylacrylamide) (PNIPAM) labeled with dansyl group is induced by 1.54 μm laser pulses (widths10 ns). The dansyl group is used to follow the transition kinetics because its fluorescence intensity is very sensitive to its micro-environment. As the molar ratio of NIPAM monomer to dansyl group increases from 110 to 300, the effect of covalently attached dansyl fluorophores on the transition decreases. In agreement with our previous study in which we used 8-anilino- l-naphthalensulfonic acid ammonium salt free in water as a fluorescent probe, the current study reveals that the transition has two distinct stages with two characteristic times, namely, Tfast≈0.1 ms, which can be attributed to the nucleation and formation of some "pearls" (locally contracting segments) on the chain, and tslow≈0.5 ms, which is related to the merging and coarsening of the "pearls".Tfast is independent of the PNIPAM chain length over a wide range (Mw=2.8× 10^6-4.2 × 10^7 g/mol). On the other hand, Tslow only slightly increases with the chain length. 展开更多
关键词 Fluorescence labeling Laser light scattering Phase transition Stimuli-sensitive polymer
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