聚(丙烯酰胺-丙烯酸)/聚(丙烯酰胺-二甲基二烯丙基氯化铵)聚电解质复合溶液动态光散射研究

通过动态光散射、粘度和透光率测定，研究了聚（丙烯酰胺 丙烯酸）［Ｐ（ＡＭ ＡＡ）］／聚（丙烯酰胺 二甲基二烯丙基氯化铵）［Ｐ（ＡＭ ＤＭＤＡＡＣ）］聚电解质复合溶液的结构和性能．结果表明，Ｐ（ＡＭ ＡＡ）与Ｐ（ＡＭ ＤＭＤＡＡＣ）复合比、溶液浓度和氯化钠用量影响溶液中复合物的构象和流体力学半径．Ｐ（ＡＭ ＡＡ）与Ｐ（ＡＭ ＤＭＤＡＡＣ）分子链间适度的库仑相互作用，可形成均相Ｐ（ＡＭ ＡＡ）／Ｐ（ＡＭ ＤＭＤＡＡＣ）聚电解质复合溶液，复合物具有较伸展的构象和较大的流体力学半径，因而溶液粘度较高．Ｐ（ＡＭ ＡＡ）与Ｐ（ＡＭ ＤＭＤＡＡＣ）分子链间过强的库仑相互作用或小分子电解质的屏蔽作用，可使复合物构象卷曲，结构紧缩，流体力学半径减小，甚至产生相分离，导致溶液粘度降低．

DYNAMIC LIGHT SCATTERING STUDY OF POLY(ACRYLAMIDE ACRYLIC ACID)/POLY(ACRYLAMIDE DIMETHYLDIALLYAMMONIUM CHLORIDE) COMPLEX SOLUTION

The structure and properties of poly(acrylamide acrylic acid)P(AM AA)]/poly (acrylamide dimethyldiallyammonium chloride)P(AM DMDAAC)] complex solution formed through Coulomb force were studied by means of dynamic light scattering,viscosity and transmittance measurements.The results show that conformation and hydrodynamic radius of the complex in solution are mainly affected by such factors as composition of the complex solution,polymer concentration,and NaCl content.Proper interaction between P(AM AA) and P(AM DMDAAC) results in a complexed homogeneous solution where,compared to the constituents,the paired polyelectrolyte molecules have more expanding conformation and larger hydrodynamic radius and,therefore,the complex solution has higher viscosity.While too strong interaction between P(AM AA) and P(AM DMDAAC) or screening effect of NaCl on complexation of P(AM AA) with P(AM DMDAAC) result in a more compact or a more coiled complex structure,leading to a reduction in hydrodynamic radius of the complex and hence a decrease in solution viscosity.