摘要
采用布氏黏度计、ULA转子，在30℃、77 r/min（85.6 s-1）下测定并计算了4种聚合物特性黏数[η]，并与乌氏法进行对比，分别计算了两种方法测定结果的标准不确定度。结果表明，布氏法操作简便，省时省力，提高工效4～5倍以上，且测量误差相对较小。布氏法和乌氏法R2标准偏差分别为0.6261%～1.4750%和3.3980%～4.9860%，[η]标准偏差分别为23.2579%～27.6825%和30.2660%～101.2736%，布氏法中[η]与R2标准不确定度均低于乌氏法，且二者R2标准不确定度相差1个数量级。布氏法测定精度高于乌氏法，平均测定精度达到0.8775%，克服了乌氏法测量范围与适用聚合物种类较窄的局限性，适用于测定中高相对分子质量普通聚合物、抗盐聚合物和疏水缔合聚合物的特性黏数，可以在石油行业推广应用。图5表3参12
Abstract
Four kinds of polymer’s intrinsic viscosity [η] were measured and calculated by using Brookfield viscometer with type of ULA rotor under the condition of 77 r/min rotor speed and 30℃. The standard uncertainty of Brookfield method and Ubbelohde method was determined respectively. Compared with Ubbelohde method, Brookfield method was simpler, more time-saving and efficient which could enhance work efficiency 4 to 5 times and the measurement error was relatively small. The R2 standard deviation of Brookfield method and Ubbelohde method was 0.6261%—1.4750% and 3.3980%—4.9860%, while the [η] standard deviation was 23.2579%—27.6825% and 30.2660%—101.2736% respectively. Therefore, the [η] and the R2 standard uncertainty in Brookfield method were lower than that in Ubbelohde method, and the R2 standard uncertainty of their differed 1 magnitude. The measuring accuracy of Brookfield method was higher than that of Ubbelohde method, and the average determination precision achieved 0.8775%. Moreover, the Brookfield method could overcome the limitations of narrow measuring ranges and fewer types of appropriate polymer that the Ubbelohde method had. It was suitable for the intrinsic viscosity measurement of common polymers, salt resisting polymers and hydrophobic associating polymers with medium or high relative molecular mass. It was a new application approach to be promoted in oil industry.
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