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首页> 外文会议>Macromolecular Symposia 211; Dresden Polymer Discussion: Polyelectrolytes; 20030316-19; Dresden(DE) >The Stability of Polyelectrolyte Complex Systems of Poly(diallydimethyl-ammonium chloride) with Different Polyanions
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The Stability of Polyelectrolyte Complex Systems of Poly(diallydimethyl-ammonium chloride) with Different Polyanions

机译：不同聚阴离子的聚（二烯丙基二甲基氯化铵）聚电解质配合物体系的稳定性

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摘要

Polyelectrolyte complex (PEC) dispersions formed by fast ionic exchange reaction between polyelectrolytes (PELs) bearing oppositely charged groups have been characterized by turbidity and dynamic light scattering. The stability of the formed PEC dispersions, the average hydrodynamic particle size d_h and the also determined polydispersity index PI of the PEC particles were of special interest. In this study poly(diallyldimethylammonium chloride) (PD) of different molar mass is used in combination with copolymers of maleic acid and α-methylstyrene (P(MS-αMeSty)) as well as propene (P(MS-P)), with a copolymer of acrylamide and sodium acrylate (PR2540~(UD)) and poly(styrene-p-sodium sulfonate) (NaPSS). A strong dependence of the PEC stability on the molar charge ratio n_-n_+, the mixing conditions and especially on the chemical structures of the used polyanions was found. If the employed polyanion (PA) have a π-system (phenyl-) in the polymer chain a higher tendency to instability results. The average hydrodynamic particle sizes d_h and the polydispersity indices PIs of the formed stable PEC dispersions determined by dynamic light scattering were strongly influenced by the mixing conditions of the PECs. If we are able to prepare stable complexes where the isoelectric point is exceeded during complex formation which is possible for PD/P(MS-P) and PD/PR2540~(UD) systems a distinct increase of d_h and decrease of PI is observed. The polymer concentration C_p and the chain length L of the used PELs have a minor effect on dh and PI.
机译：通过带有相反电荷的基团的聚电解质（PEL）之间的快速离子交换反应形成的聚电解质复合物（PEC）分散体的特征是浊度和动态光散射。所形成的PEC分散体的稳定性，平均流体动力学粒度d_h以及还确定的PEC颗粒的多分散指数PI是特别令人关注的。在这项研究中，将不同摩尔质量的聚二烯丙基二甲基氯化铵（PD）与马来酸和α-甲基苯乙烯（P（MS-αMeSty））以及丙烯（P（MS-P））的共聚物结合使用，丙烯酰胺和丙烯酸钠（PR2540〜（UD））和聚（苯乙烯-对磺酸钠）（NaPSS）的共聚物。发现PEC稳定性强烈依赖于摩尔电荷比n_-n_ +，混合条件，尤其是所使用的聚阴离子的化学结构。如果所使用的聚阴离子（PA）在聚合物链中具有π-系统（苯基-），则会导致更高的不稳定性趋势。通过动态光散射确定的所形成的稳定PEC分散体的平均流体动力学粒径d_h和多分散指数PIs受到PEC的混合条件的强烈影响。如果我们能够制备出稳定的配合物，在配合物形成过程中等电点被超过，这对于PD / P（MS-P）和PD / PR2540〜（UD）系统是可能的，则观察到d_h明显增加而PI降低。所使用的PEL的聚合物浓度C_p和链长L对dh和PI的影响较小。

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