交联网络和浓溶液中高分子链运动的NMR研究Ⅰ.NMR质子线型分析

The NMR Studies of Macromolecular Segement Motion in Crosslink Polymer Network and Concentrated Polymer Solution Ⅰ. Analyzing of NMR Proton Line Shape

用质子ＮＭＲ谱对交联凝胶高分子（聚丙烯酰胺－丙烯酸）网络与线型高分子（聚苯乙烯）浓溶液体系的ＮＭＲ线型进行了比较研究。结果表明，两种体系中高分子链段运动具有不同的特征：在充分溶胀的交联凝胶高分子网络中，交联点间的链段运动比较自由，交联点的运动则比较慢，使其质子谱呈现“超洛伦兹”线型；而在线型高分子浓溶液中，缠结点间的链段与缠结点一样，运动并不自由。

The 1 H-NMR spectrum is used to study the line shapes of crosslink polymer gel (polyacrylamide-acrylic acid) and linear polymer (polystyrene) in solutions comparatively. The results demonstrate that the polymers in these two systems show obviously different segment movement characteristics. In well swollen crosslink polymer gel network, the free movement of segment between crosslink points and the restricted movement of crosslink point make 1 H-NMR spectrum of the gel network be “super lorentzian” line shape. While in the concentrated solution of linear polymer, the movements of the segments between entangled points as well as the entangled points are restricted, making the 1 H-NMR spectrum of the linear polymer be broad line-wide Gaussian line shape.