摘要
In order to investigate the property and concentration dependence of dissociation and hydrolysis of polyelectrolytes,acrylic acid-sodium acrylate copolymers with various degree of neutralization were prepared by adding calculated amounts of sodium hydroxide into the aqueous solutions of a poly(acrylic acid) sample,and the pH values of the solutions covering a wide concentration range were measured for each copolymer at 25℃.It was found that the pH values of the solutions of a copolymer with degree of neutralization of 0.96 kept constant and equaled to 9.80 as c>0.001 mol/L.For another copolymer with degree of neutralization of 0.30,the pH values of its solutions remained constant and equaled to 6.25 as c<0.001 mol/L.These two copolymers may serve as polymeric buffer reagents which couldn’t penetrate through semi-permeable membranes in the corresponding concentration regions.
In order to investigate the property and concentration dependence of dissociation and hydrolysis of polyelectrolytes, acrylic acid-sodium acrylate copolymers with various degree of neutralization were prepared by adding calculated amounts of sodium hydroxide into the aqueous solutions of a poly（acrylic acid） sample, and the pH values of the solutions covering a wide concentration range were measured for each copolymer at 25℃. It was found that the pH values of the solutions of a copolymer with degree of neutralization of 0.96 kept constant and equaled to 9.80 as c 〉 0. 001 mol/L. For another copolymer with degree of neutralization of 0.30, the pH values of its solutions remained constant and equaled to 6.25 as c 〈 0. 001 mol/L. These two copolymers may serve as polymeric buffer reagents which couldn＇t penetrate through semi-permeable membranes in the corresponding concentration regions.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2005年第4期484-485,共2页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号20204004和20474026)
国家教育部博士点基金(基金号2003028403)资
