The grafted membranes were capable of rejecting an anionic dyestuff . in common with other polyelectrolytes , the conformation of grafted ampsa polymeric chains is sensitive to environmental factors such as ph and ionic strength ( i ) 聚丙烯酰胺基甲基丙磺酸為高分子電解質,接枝在膜表面后高分子鏈與溶質分子相互作用,可使接枝鏈構象發生變化,從而改變膜孔徑的大小,使膜具有環境響應。