P(AA-co-DMMAC) hydrogels were synthesized by γ ray irradiation polymerization. The pH value responsive behaviors of hydrogels with different monomer ratios of (DMMC:AA) was studied. When the ratios were 1:3
1:4
1:5
and 1:6
the response behaviors was similar. At pH=7
the gels had large swelling properties
while at higher and lower pH values
the swelling was smaller. The situation was reversed when the monomer ratio was 1:2.