摘要
测定了不同中和度聚丙烯酸水溶液的黏度,结果表明,在中和度为0.25时聚丙烯酸水溶液比浓黏度出现最大值。进一步测定了中和程度分别为0.04和0.09、以及没有经过中和的聚丙烯酸水溶液比浓黏度的浓度依赖性,发现存在着两个特征的浓度C1和C2。当溶液的浓度小于C1时,高分子溶液的比浓黏度保持恒定;当溶液的浓度大于C1时,高分子溶液的比浓黏度随着浓度的增加而增加。当溶液浓度达到C2时高分子溶液比浓黏度对浓度作图再次出现转折,此时进一步增加溶液的浓度,高分子溶液比浓黏度虽然继续增加,但是增加的梯度有所下降。高分子溶液比浓黏度的浓度依赖性与溶液中高分子内和高分子之间相互作用密切相关。
The viscosity of poly（acrylic acid） （PAA） with the various degree of neutralization in aqueous solution was measured. It has been noted that the reduced viscosity of solution reaches the maximum as the degree of neutralization of PAA is 0.25. By measuring the concentration-dependent reduced viscosity of PAA with the neutralization of 0.04 and 0.09, and PAA free from neutralization in aqueous solution, the two critical concentrations, namely C1 and C2, has been found. If the concentration of polymer solution is less than C1, the reduced viscosity of .solution keeps constant. On the other hand, if the concentration of polymer solution is greater than C1, the reduced viscosity of solution increases linearly with concentration. The relationship between the reduced viscosity and concentration at the concentration greater than C2 has proved to be different from that less than C2. In fact, the reduced viscosity increases more gradually at the concentration greater than C2. The intramolecular and intermolecular interaction should be responsible for the result.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2008年第10期99-102,共4页
Polymer Materials Science & Engineering
基金
高等学校博士学科点专项基金(20040358018)
安徽省自然科学基金(050440906)资助课题
