1)regular block,规整嵌段2)unregulated block,不规整嵌段3)irregular block,非规整嵌段4)isotactic block,等规嵌段5)well-defined hard segment,规整硬段6)isotactic block,有规立构嵌段
用法例句
A series of polyether based polyurethaneurea(PUU) aqueous dispersions with well-defined hard segments were prepared by fractional steps with polyether polyol, 4,4′-diphenylmethane diisocyanate,dimethylolpropionic acid,1,4-butanediol,isophorone diisocyanate and ethylenediamine.
