^(13)C-NMR方法研究酚酞聚芳醚酮砜共聚物的序列结构

THE DETERMINATION OF SEQUENCE STRUCTURE OF PP-DCDPK-DCDPS COPOLYMERS BY ^(13)C-NMR

通过亲核共缩聚合成了一系列酚酞聚芳醚酮砜共聚物和嵌段共聚物 ,并利用1 3C NMR方法研究了共聚物的链结构 ,通过观察酚酞单元中三个位置的季碳原子的化学位移及其相应强度的变化 ,计算共聚物中不同链段的共聚物的组成、平均序列长度和无规度 .结果表明 ,除嵌段共聚物外 ,其它共聚物的无规度均接近 1 ,表明共聚物为无规共聚物 ,而且对三个位置的季碳原子分析均得出了相同的结果 .

A series of phenolphthalein containing copolymers were synthesized from nucleophilic polycondensation of 4,4′ dichlorobenzophenone (DCDPK),4,4′ dichlorodiphenyl sulphone (DCDPS) and phenolphthalein (PP).In order to investigate their chain structures, 13 C NMR spectra of these copolymers were recorded.The average sequence lengths,the degrees of randomness and compositions of the copolymers were calculated from the intensities of three kinds of signals,which corresponded to the chemical shifts of three kinds of quaternary carbon atoms in phenolphthalein units in the copolymers.The same results obtained from the three sorts of signals indicated that except the block copolymer,the degree of randomness of other copolymers was approximate to 1,in other words,these copolymers were random copolymers.