Fluorescence Studies on Morphological Change of St/DVB Crosslinked Gels During Chloromethylation

Abstract

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 morpology of the crosslinked gels becomes more homogeneous with chloromethylation.

Key words: Crosslinked Polystyrene, Chloromethylation, Fluorescence Spectroscopy, Hypercrosslinked

CLC Number:

O614

TrendMD:

LI He-Xian, WANG Guo-chang, WANG Lin, WANG Ying, HE Bing-Lin. Fluorescence Studies on Morphological Change of St/DVB Crosslinked Gels During Chloromethylation[J]. Chem. J. Chinese Universities, 2001, 22(S1): 264.

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Fluorescence Studies on Morphological Change of St/DVB Crosslinked Gels During Chloromethylation

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