激光光散射研究丙烯酰胺-二甲基二烯丙基氯化铵共聚物的溶液行为

用激光光散射技术表征了阳离子含量受控的丙烯酰胺 二甲基二烯丙基氯化铵共聚物 (简称P(AM DMDAAC) )在 0 1mol LNaCl溶液中的基本参数和溶液行为 .表观基本参数 : Mw ,app =5 0 4× 10 5g·mol- 1 、app =39 9nm和A2 ,APP =1 5× 10 - 4cm3·mol·g- 2 .动态光散射研究结果表明 ,扩散系数Dt 与角度、浓度皆呈非线性依赖关系 ,当C >C 或在较大的散射角域 ,Dt 偏离线性关系所预示的理论值而向减小的方向发展 ,表明存在缔合物 ;流体力学半径Rh 分布有大、小两个范围 ,并随温度升高向小尺寸方向发展 ,证明了体系中存在缔合行为以及升温的解缔合作用 .在一定条件下 ,“亚稳定性”的存在有力地旁证了体系的缔合行为

LASER LIGHT SCATTERING STUDY ON SOLUTION BEHAVIOR OF POLY(ACRYLAMIDE-co-DIMETHYLDIALLYLAMMONIUM CHLORIDE)

Polymer flooding agents play an important role in enhanced oil recovery (EOR).A new way to prepare polymer flooding agents through complexation of two oppositely charged polymers has attracted much attention. Poly(acrylamide co dimethyldiallylammonium chloride)P(AM DMDAAC)] is a novel cationic polyeletrolyte which can be used as the component of polyelectrolyte complex for EOR.The basic parameters and behavior of P(AM DMDAAC),in which cationic component is controlled,in 0 1 mol/L NaCl aqueous solution were characterized by dynamic and static laser light scattering.The apparent basic parameters of P(AM DMDAAC) are as follows: w,app =5 04×10 5 g·mol -1 ,< R g> app =39 9 nm, A 2,app =1 57×10 -4 cm 3·mol·g -2 .From the results of dynamic light scattering,the curves of D t versus c and scattering angle θ, all are nonlinear and turning down.The phenomena imply that both the chains of P(AM DMDAAC) in 0 1 mol/L NaCl aqueous solution appear polydispersity and there are some associates.Furthermore,the distribution ranges of the hydrodynamic radii ( R h ) can be divided into two parts, for R h value,one part is relative smaller,another is relative larger.Reasonably,the later can be attributed to association.When temperature raises,both parts develop towards the direction of the reducing R h,so the behaviors of association and disassociation are evidenced again.Under certain conditions,the existing of “metastable behavior” is a power circumstantial evidence for association behavior of P(AM DMDAAC) in 0 1 mol/L NaCl aqueous solution.These results provide basic data for preparing novel flooding agents by complexation of polyelectrolyte.