| FLUORESCENCE STUDIES ON MORPHOLOGICAL CHANGE OF ST/DVB CROSSLINKED GELS DURING CHLOROMETHYLATION |
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| 作者姓名： | ZHANG Jixiang LI Hexian** WANG Guochang WANG Lin WANG Ying HE Binglin State Key Laboratory of Functional Polymer Materials For Adsorption and Separation and Institute of Polymer Chemistry Nankai University Tianjin China |
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| 作者单位： | ZHANG Jixiang LI Hexian** WANG Guochang WANG Lin WANG Ying HE Binglin State Key Laboratory of Functional Polymer Materials For Adsorption and Separation and Institute of Polymer Chemistry，Nankai University，Tianjin 300071，China |
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| 基金项目： | National Natural Scientific Foundation of China (Project grant No.29574165，29928003，29874019)，National Natural Scientific Foundation of Tianjin (Project grant No.013604011) |
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| 摘 要： | 1. INTRODUCTION Crosslinked polymer gels have solid-liquid dual performance, which play an important role in modern high technology 1]. A wide variety of functional and intelligent materials can be prepared via chemical modification of crosslinked polym…
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FLUORESCENCE STUDIES ON MORPHOLOGICAL CHANGE OF ST/DVB CROSSLINKED GELS DURING CHLOROMETHYLATION |
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| ZHANG Jixiang LI Hexian** WANG Guochang WANG Lin WANG Ying HE Binglin State Key Laboratory of Functional Polymer Materials For Adsorption and Separation and Institute of Polymer Chemistry,Nankai University,Tianjin ,China.FLUORESCENCE STUDIES ON MORPHOLOGICAL CHANGE OF ST/DVB CROSSLINKED GELS DURING CHLOROMETHYLATION[J].离子交换与吸附(英文版),2002(2). |
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| Authors: | ZHANG Jixiang LI Hexian WANG Guochang WANG Lin WANG Ying HE Binglin State Key Laboratory of Functional Polymer Materials For Adsorption and Separation and Institute of Polymer Chemistry Nankai University Tianjin China |
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| Institution: | ZHANG Jixiang LI Hexian** WANG Guochang WANG Lin WANG Ying HE Binglin State Key Laboratory of Functional Polymer Materials For Adsorption and Separation and Institute of Polymer Chemistry,Nankai University,Tianjin 300071,China |
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| Abstract: | The morphological change of St/DVB crosslinked gels during chloromethylation was studied by fluorescence spectroscopy using St/DVB crosslinked and hypercrosslinked gels as control samples. It has been found that with increase of chlorine content, the excimer emission band (~325nm) approaches to vanish, while the intensity of multi-ring aggregate emission band (~420nm) quickly reaches a maximum, and then decreases sharply accompanied by appearance of a new broad band centred at ca 488nm which roughly coincides with the typical emission band of hypercrossllinked St/DVB gels. Mearwhile, the result of IR measurement suggests that methylene bridge between phenyl rings forms and increases with chloromethylation process. These results are explained in terms of a side reaction of post-crosslinking, which densifies the loosely crosslinked networks and undoes the densely entangled microgel nuclei. As a result, the morphology of the crosslinked gels becomes more homogeneous with chloromethylation. |
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| Keywords: | Crosslinked Polystyrene Chloromethylation Fluorescence Spectroscopy Hypercrosslinked Gels |
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