Cai Jiali, Bo Shuqin, Cheng Rongshi, Jiang Liansheng, Yang Yu
Department of Biochemistry and National Laboratory of Pharmaceutical Biotechnology and Key Laboratory of Mesoscopic Materials Science, Nanjing University, Nanjing 210093, People's Republic of China.
J Colloid Interface Sci. 2004 Aug 1;276(1):174-81. doi: 10.1016/j.jcis.2004.03.008.
Viscosities of aqueous solutions of five polyethylene oxide (PEO) samples with molar masses from 1.5 x 10(5) to 1.0 x 10(6) were carefully measured in a polytetrafluoroethylene (PTFE) capillary Ubbelohde viscometer in the concentration range from dilute down to extremely dilute concentration regions and compared with those of the same sample obtained from a glass capillary viscometer. At the same time, viscosities of aqueous solutions of three PEG samples in glass and paraffin-coated capillary viscosity were measured. The wall effects occurred in viscosity measurements for PEO and PEG aqueous solutions in different capillary viscometers were theoretically analyzed and discussed. It was found that different interfacial behaviors occurred in both hydrophobic and hydrophilic capillary viscometers respectively and the interfacial behaviors also exhibit molar mass dependence.
在聚四氟乙烯（PTFE）毛细管乌氏粘度计中，仔细测量了摩尔质量从1.5×10⁵到1.0×10⁶的五个聚环氧乙烷（PEO）样品水溶液在从稀溶液到极稀溶液浓度范围内的粘度，并与从玻璃毛细管粘度计获得的相同样品的粘度进行了比较。同时，测量了三个聚乙二醇（PEG）样品在玻璃毛细管和石蜡涂层毛细管粘度计中的水溶液粘度。从理论上分析和讨论了不同毛细管粘度计中PEO和PEG水溶液粘度测量时出现的壁效应。结果发现，疏水性和亲水性毛细管粘度计中分别出现了不同的界面行为，且界面行为也表现出摩尔质量依赖性。
