【摘要】 在40℃下测定聚丙烯腈离子液体([BMIM]BF4)稀溶液的特性粘度[η],发现其比浓增比粘度(ηsp/C)与浓度C并不成线性,而是在低于某个浓度时曲线发生向上弯曲,这种现象早在20世纪50年代的很多高分子溶液中得到证实。发生这一情况的原因仅仅是由于高分子链在毛细管表面的吸附效应。利用在朗缪尔等温线基础上建立起来的吸附效应理论,能很好地修正实验中得到的粘度数据。更多还原

【Abstract】 Measurements of the dilute solution intrinsic viscosities of polyacrylonitrile in ionic liquid ([BMIM]BF_ 4) were carried out at the temperature of 40℃. The curve of reduced viscosities (η_ sp/C) against concentration shows not linear but upward as the concentration below definite concentration and this is similar to the phenomena observed for many polymer solutions in the early 1950s. It is only due to the effect of adsorption of polymer chains on the viscometer wall surface. On the theory of the adsorption effect based on the Langmuir isotherms, the data of the experiment was corrected and the true intrinsic viscosities were got.更多还原