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粘度法是测定高聚物分子的大小与结构最简便、最常用的方法.在用粘度法测定高聚物分子大小与结构时,需求得极限粘数[η].为此,需确立高分子溶液粘度与浓度的关系,文献中有过种种不同的函数式.通常,将ηsp/c、logηsp/c、lnηr/c对c或ηsp/c对ηsp作图外推到c为零或ηsp为零得[η].Heller对各种外推方法进行了详细的研究,可是到目前为止,采用的成对外推公式不多,且有明显的缺陷.
Viscosity method is the simplest and most commonly used method to determine the size and structure of polymer molecules.It is necessary to obtain the limiting viscosity number [η] in the determination of polymer molecular size and structure by viscosity method.Therefore, it is necessary to establish the polymer Solution viscosity and concentration, there have been a variety of different functions in the literature.Usually ηsp / c, logηsp / c, lnηr / c of c or ηsp / c on ηsp mapping extrapolated to c is zero or ηsp is Zero [η]. Heller carried out a detailed study of the various extrapolation methods, but so far, the use of pairs of extrapolation formula is small, and there are obvious shortcomings.