regular block

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.

以二苯基甲烷二异氰酸酯、二羟甲基丙酸、1,4-丁二醇、异佛尔酮二异氰酸酯和乙二胺为硬段,聚醚多元醇为软段,通过分子设计采用分步合成法,制备了具有规整硬段和良好分散性能的聚醚型聚氨酯脲(PUU)水分散液。