摘要
考察了相反电荷聚电解质浓溶液的复合体系形成宏观单相的可能性,发现只有当聚电解质所带电荷被完全屏蔽时才可能呈宏观单相体系。弱聚电解质NaPAA与PDADMAC复合体系当聚合物总浓度大于13.3wt%时即为均相溶液,具有与中性高分子稀溶液相似的流变行为。而强聚电解质ADPy/PDADMAC、NaPSS/PDADMAC复合体系为悬浮液。粘弹性测试表明NaPSS/PDADMAC体系中形成了由聚离子桥链连接复合物粒子构成的三维网络。
The phenomena of phase separation of the mixture of concentrated solution of oppositely charged polyelectrolytes cannot be suppressed until all of the charges of polyelectrolytes are screened. When the overall polymer concentration is larger than 13.3 wt%, the mixture of weak polyanion （Na-polyacrylate） and polycation （polydiallyldimethylammonium chloride ）, PDADMAC is a homogeneous system, which has the rheological behavior similar to that of a dilute solution of uncharged polymer. Both the mixture of strong polyanion （Na-polystyrenesulfonate, NaPSS） and PDADMAC and that of ADPy and PDADMAC are suspension. Only when there is enough low molecular salt does the system become a homogeneous one because of the dissociation of the complexes. The viscoelastic properties of NaPSS/PDADMAC complex were studied by using the dynamic viscoelastometer and the results indicated that three dimensional networks were formed from complex particles bridged by polyions in NaPSS/PDADMAC mixture.
出处
《化学世界》
CAS
CSCD
北大核心
2005年第9期537-540,共4页
Chemical World
关键词
聚电解质浓溶液
复合体系
粘弹性
concentrated polyelectrolyte solution
complex
viscoelastic properties
