聚合法对疏水缔合聚丙烯酰胺粘度的影响

为了增强聚丙烯酰胺的增粘性能,提高其抗剪切、抗温和抗盐性,使用实验室自制的疏水单体、丙烯酰胺和离子型单体,通过3种不同的聚合方法进行自由基共聚合。分析了不同聚合途径下,研究组分、剪切、温度和盐对聚合物溶液表观粘度的影响。结果表明,反相乳液聚合法的产物的临界缔合浓度小于0.4 g/L,85℃下粘度保持60%以上,其表观粘度在受剪切后的恢复率达到100%,抗剪切性能明显。利用一种小分子化合物来抑制Fe2+对聚合物的降解作用,达到保持聚合物溶液粘度目的。

Effect of synthesis approach on viscosity property of hydrophobic associated molecule modified polyacrylamide

Hydrophobic monomer is prepared in our lab,which is employed to prepare tripolymer together with ionic monomer and acrylamide,so as to increase the viscosity of polyacrylamide and the resistance to high temperature and high shear rate as well as high salt concentration.Rotary viscosimeter is employed to reflect the effect of the composition,shear,temperature and salt concentration on viscosity of the modified polyacrylamide was studied in different synthesis approaches.The result shows that inverse emulsion polymerization product has the better comprehensive properties.Critical associated concentration less than 0.04 g/dL,the viscosity keeps over 60% at 85 ℃.And the apparent viscosity of the copolymer with the hydrophobic monomer appears higher recovery ratio(100%) after suffering shearing.As well in the paper,certain kind of small compound is used for keep high viscosity of the modified polymer against Fe2+.