Studies on Molecular Interactions of Charged Poymer Gels

（1）离子络合聚合物凝胶（ICPG）研究了ICPG的结构与流变性能的关系。用溶胀实验和毛细管粘度计分别测定了ICPG的溶胀率和相应聚合物溶液的粒径，发现两个体系之间存在相似性。结果表明，道南势对ICPG的溶胀率有重要影响。（2）弱荷电温敏聚合物凝胶用小角中子散射（SANS）研究了N-异丙基丙烯酰胺-丙烯酸共聚物（NIPA/AAc）凝胶。NIPA/AAc凝胶和相应的聚合物溶液之间的静态结构因子的明显差异已被观察到。在凝胶的情况下，仅形成微相分离，而在NIPA/AAc聚合物溶液中观察到微相和大相分离。在NIPA/AAc中不存在大相分离是由于凝胶中缺乏平移自由。通过差示扫描量热法（DSC）定量分析了AAc共聚单体对疏水相互作用焓的依赖性。DSC中吸热曲线的开始与发生微相分离的温度一致。

(1)Ion-complexed polymer gels (ICPG) Correlation of the structure and rheological properties of ICPG has been discussed. The swelling ratio of ICPG and the size of the corresponding polymer solutions have been measured by a swelling experiment and capillary viscometry, respectively and an analogy is found between the two systems. It is found that Donnan Potential plays an important role in determining the swelling ratio for ICPG.(2)Weakly charged temperature sensitive polymer gels Small-angle neutron scattering (SANS) studies have been carried out on poly (N-isopropylacrylamide-co-acrylic acid) (NIPA/AAc) gels. A distinct difference in the static structure factors between NIPA/AAc gels and the corresponding polymer solutions has been observed. In the case of the gel, a microphase separation is exclusively formed, whereas both microphase and macrophase separation have been observed in NIPA/AAc polymer solutions. The absence of the macrophase separation in NIPA/AAc results from lack of translational freedom in the gel. Quantitative analysis for AAc comonomer dependence of the enthalpy of hydrophobic interaction has been also conducted by differential scanning calorimetry (DSC). The onset of an endothermic curve in DSC is consistent with the temperature at which microphase separation takes place.