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首页> 外文期刊>RSC Advances >Amphiphilic gels of solvatochromic fluorescent poly(2-oxazoline)s containing D-pi-A pyrenes
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Amphiphilic gels of solvatochromic fluorescent poly(2-oxazoline)s containing D-pi-A pyrenes

机译：含D-pi-A so的溶剂化变色荧光聚（2-恶唑啉）的两亲性凝胶

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Herein, we report amphiphilic, fluorescent, solvatochromic poly(2-methyl-2-oxazoline) (POZO-py) and poly(2-ethyl-2-oxazoline) (PEtOZO-py), which contain D-pi-A pyrene dye units in their side chains. These new fluorescent polymers display solvatochromism and bright fluorescence in a variety of solvents, ranging from toluene (475 nm) to methanol (515 nm) and water (535 nm). Furthermore, amphiphilic gels (amphigels) of POZO-py and PEtOZO-py were synthesized by cross-linking the amine sites of partially hydrolyzed POZO-py and PEtOZO-py. Amphigels were formed rapidly when bridging ethyleneimine moieties were used for POZO-py and PEtOZO-py. These amphigels swell in various solvents, resulting in a solvatochromic shifts of the fluorescence emission. We furthermore determined the relationship between the swelling process, the solvatochromic properties, and the polymer structure of the POZO-py and PEtOZO-py gels. The different swelling properties led to different amphigel structures in water and hence, to different maximum fluorescence wavelengths. For example, a POZO-py amphigel with 10% ethyleneimine bridging exhibited the same solvatochromic behavior as POZO-py in solution. These results are significant in order to evaluate the solvatochromic properties of pyrene chromophores in polymers and to investigate gel structures and functional group interactions in gels.
机译：在此，我们报告了含有D-pi-A ene染料的两亲性，荧光，溶剂变色的聚（2-甲基-2-恶唑啉）（POZO-py）和聚（2-乙基-2-恶唑啉）（PEtOZO-py）侧链中的单位。这些新的荧光聚合物在从甲苯（475 nm）到甲醇（515 nm）和水（535 nm）的各种溶剂中均显示出溶剂变色和明亮的荧光。此外，通过使部分水解的POZO-py和PEtOZO-py的胺位交联，合成了POZO-py和PEtOZO-py的两亲性凝胶（两性凝胶）。当桥接的亚乙基亚胺部分用于POZO-py和PEtOZO-py时，两性胶迅速形成。这些两性凝胶在各种溶剂中溶胀，导致荧光发射发生溶剂化变色。我们还确定了POZO-py和PEtOZO-py凝胶的溶胀过程，溶剂变色性质和聚合物结构之间的关系。不同的溶胀特性导致水中的两性凝胶结构不同，因此导致不同的最大荧光波长。例如，具有10％乙撑亚胺桥联的POZO-py两性凝胶在溶液中的溶解变色行为与POZO-py相同。这些结果对评估聚合物中pyr发色团的溶剂溶变色性质以及研究凝胶中的凝胶结构和官能团相互作用具有重要意义。

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