Preparation of polymer latex particles carrying salt-responsive fluorescent graft chains
Preparation of polymer latex particles carrying salt-responsive fluorescent graft chains
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DOI：
10.1016/j.polymer.2014.08.030
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发表时间：
2014-09
期刊：
影响因子：
4.6
通讯作者：
Masakatsu Kasuya;T. Taniguchi;Michinari Kohri;K. Kishikawa;T. Nakahira
中科院分区：
文献类型：
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作者：
Masakatsu Kasuya;T. Taniguchi;Michinari Kohri;K. Kishikawa;T. Nakahira
我们制备了一种新型的荧光聚合物胶乳粒子，它可以随着水中氯化钠浓度的增加而改变其荧光强度。以苯乙烯和甲基丙烯酸2-(2-氯异丁氧基)乙酯为原料，采用无皂乳液聚合法合成了核聚合物乳胶粒子。以甲基丙烯酸甲氧基聚乙二醇酯(MEOxMA，x=4或9)和甲基丙烯酸缩水甘油酯为单体，通过表面引发原子转移自由基共聚合，在核颗粒上接枝了含环氧基团的亲水高分子链。接枝链上的环氧基团被叠氮后，通过铜催化叠氮-炔环加成反应，成功地将水溶性荧光丹磺酰衍生物偶联到接枝链上。带有较长聚乙二醇侧链的聚合物颗粒(x=9.9)的最大荧光强度波长略有蓝移(7 Nm)，并且随着氯化钠浓度的增加，其最大荧光强度增加(1.35倍)，而带有较短聚乙二醇链的聚合物颗粒(x=9.4)的最大荧光强度随氯化钠浓度的增加而增加。
We prepared the novel fluorescent polymer latex particles which can change their fluorescence intensity in response to the increasing NaCl concentration in water. Core polymer latex particles were synthesized by emulsifier-free emulsion polymerization of styrene and 2-(2-chloroisobutyroyloxy)ethyl methacrylate. Hydrophilic polymer chains containing epoxy groups were grafted from the core particles by surface-initiated atom transfer radical copolymerization of methoxy polyethyleneglycol methacrylate (MEOxMA,x= 4 or 9) and glycidyl methacrylate in aqueous media. After azidation of epoxy groups in graft chains, a water-soluble fluorescent dansyl derivative was successfully coupled with the graft chains by copper-catalyzed azide-alkyne cycloaddition in aqueous media. The wavelength of maximum fluorescence intensity of polymer particles carrying graft chains with longer PEG side chains (x= 9) was slightly blue-shifted (7 nm) and the fluorescence intensity increased (1.35 times) with an increase in NaCl concentration as opposed to polymer particles with shorter PEG chains (x= 4).