A new method for characterizing St/DVB copolymer heterogeneity by phenyl aggregatefluorescence has been developed and used to study the effects of crosslinking degree,crosslinker and diluent onthe heterogeneity of the...A new method for characterizing St/DVB copolymer heterogeneity by phenyl aggregatefluorescence has been developed and used to study the effects of crosslinking degree,crosslinker and diluent onthe heterogeneity of the copolyruer gels.The results show that St/m-DVB copolymer gel is more homogeneousin structure than St/p-DVB copolymer gel,whereas increasing crosslinking degree and the proportion of goodsolvent in diluent lead to an increase of gel heterogeneity.These results provide structural evidence which mayserve as a bridge between St/DVB crosslinking reaction and the copolymer properties.展开更多
The photophysical properties of some cross-linked/linear styrene polymers are studied.Ithas been further demonstrated that the phenyl multi-ring aggregate forms not only in excited state instyrene/divinylbenzene cross...The photophysical properties of some cross-linked/linear styrene polymers are studied.Ithas been further demonstrated that the phenyl multi-ring aggregate forms not only in excited state instyrene/divinylbenzene cross-linked polymers hut also in ground state.Moreover,the similar multi-ring ag-gregate has also been observed in linear polystyrene with structural heterogeneity.These results are ex-plained in terms of 'superdense structure' formed by chemical cross-linking and physical gelation,whichcharacterize the morphological heterogeneity in styrene polymers.展开更多
基金the Natural Science Foundation of Tianjin,China.
文摘A new method for characterizing St/DVB copolymer heterogeneity by phenyl aggregatefluorescence has been developed and used to study the effects of crosslinking degree,crosslinker and diluent onthe heterogeneity of the copolyruer gels.The results show that St/m-DVB copolymer gel is more homogeneousin structure than St/p-DVB copolymer gel,whereas increasing crosslinking degree and the proportion of goodsolvent in diluent lead to an increase of gel heterogeneity.These results provide structural evidence which mayserve as a bridge between St/DVB crosslinking reaction and the copolymer properties.
文摘The photophysical properties of some cross-linked/linear styrene polymers are studied.Ithas been further demonstrated that the phenyl multi-ring aggregate forms not only in excited state instyrene/divinylbenzene cross-linked polymers hut also in ground state.Moreover,the similar multi-ring ag-gregate has also been observed in linear polystyrene with structural heterogeneity.These results are ex-plained in terms of 'superdense structure' formed by chemical cross-linking and physical gelation,whichcharacterize the morphological heterogeneity in styrene polymers.
