快速静态渗透压法测定聚电解质—PDS的分子量

本文采用快速静态渗透压法,以0.2MNaNO_3水溶液为介质测定了聚电解质—二甲基二烯丙基氯化铵二氧化硫共聚物(PDS)的分子量、维利系数A_2、A_3及有效电荷特征值Z~2/C′_s。结果表明,PDS的为1.2×10~5,作为长效粘土稳定剂不会造成地层堵塞,油层伤害;A_2为正值,与强聚电解质的结构特征和溶剂体系相符;Z~2/C′_s值较大即聚合物分子链上有效电荷数多,与带负电的粘土结合力强,防膨性能好。

Determination of Molecular Weight of Polyelectrolyte——PDS by Quick Quiet Membrane Osmometry

The molecular weight (M_n)、virial coefficients A_2 and A_3 as well as the characteristic value of Z~2/C′, of the effective charges of the polyion for polyelectrolyte—dimethyl—diallylammonium chloride—CO—Sulfur dioxide (FDS) were determined in its 0.2 M NaNO_3 water solution by quick quiet membrane osmometry. The results show that the M_n of PDS is 1.2×10~5, being longterm effective clay stabilization agent; PDS will not plug and damage the formation, the value of A_2 is positive, it comforing with the stucture characteristics of strong polyelectrolyte and solvent system; the greater the value of Z~2/C′, (i. e. there are more charges on the polymer molecular chain), the stronger the combining force of macromolecule chain with clay having negative charges, and the better the property of preventing the clay from swelling.