Description of a high‐performance density cell. Application to new investigations in the field of polymers studies

摘要

AbstractA new density cell based on the vibrating tube principle is described. This cell provides an accuracy of density measurements of 2 × 10−6g/cm3and presents a great stability with respect to temperature and time variations. In two experiments—measurement of self‐diffusion coefficient of heavy water through membrane and determination of partial specific volume of polymers in very dilute solutions—it is shown that such a precision leads to new types of invest