Polymer system

Critical dissolution pH

Critical ionization

PMAA/PHEA

4.0

1%

PMAA/PEO

4.6

1%

PMAA/PAAM

5.0

4%

PMAA/PVME

6.0

2%

PMAA/PNIPAAM

6.2

3%

PMAA/PVPON

6.4

~8 ?10%

PMAA/PVCL

6.95

30%