高分子稀溶液粘度方程中Huggins系数的新解释

The chain length dependency of molar association constant K_a of polymer in solution was investigated theoretically. K_a is proportional to the effective hydrodynamic volume V_ eff of polymer chain in solution. V_ eff is the product of a shape factor and hydrodynamic volume. On the basis of these results, the observed enhancement of Huggins coefficient for short chain and branched polymer could be satisfactorily interpreted.

溶剂/PET体系气液平衡研究

采用反相气相色谱法测定了溶剂/PET在不同温度下无限稀溶剂活度系数和F lory-hugg ins相互作用参数。应用UN IFAC-FV、GK-FV和E lbro-FV模型对溶剂/PET体系中以质量分率表示的无限稀释活度系数进行了估算。结果表明,UN IFAC-FV模型能相对较好地预测溶剂/PET体系中溶剂的无限稀释活度系数。