Studies on synthesis and performances of pH-sensitivity of poly(acrylic acid)-co-(α-methacrylic acid) hydrogels

Aim To pH-sensitivity of poly(acrylic acid)-co-(α-methacrylic acid) hydrogels were synthesized.The influences of N,N'-methene biacrylamide(MBAA) cross-linker,monomer concentration,polymerization time and temperature on swelling ratio were investigated,and reversibility of the hydrogels under various pH conditions at given temperature.Methods Six poly(acrylic acid)-co-(α-methacrylic acid) hydrogels were synthesized by acrylic acid(AA) with methyl acrylic acid(MAA) co-polymerization.Correlation parameters were mensurated by using general methods.Results The poly(acrylic acid)-co-(α-methacrylic acid) hydrogels synthetic conditions were at 60 ℃ polymerization temperature,0.1503 g MBAA,8.2 mL AA,5.1 mL MAA,60 mL water,and the hydrogel D structure and performance is best when reaction at 60 ℃and pH=10.20.Conclusion The conjunct polymerization method is convenient,the reaction conditions are easily controlled,characterization of the product's structure and performance are also easy.The hydrogels have pH sensitivity,when pH is rising,the swelling ratio get rising.