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用不同浓度的纤维素/NMMO·H2O溶液,采用流变法测定纤维素的相对分子质量及其分布,并与凝胶渗透色谱(GPC)法进行对比.结果表明:采用流变法测试时,尽管溶液浓度对测量结果有影响,但浓度越高,这种影响程度越小.因此采用尽量高的溶液浓度,可以得到更为稳定的结果.同时,当纤维素/NMMO·H2O溶液的浓度固定时,所测得的相对分子质量及其分布与GPC法测得结果大小是相对应的.流变法中,根据Tuminello的“稀释假定”理论,利用动态流变G′和G″的主曲线,计算出纤维素的相对微分相对分子质量分布;应用Wesslan函数适应法(相对分子质量分布的模型函数)计算出相对分子质量分布的多分散指数(PDI).
The relative molecular mass and distribution of cellulose were determined by different concentrations of cellulose / NMMO · H2O solution and compared with the gel permeation chromatography (GPC) method.The results showed that when using the rheological method, although the solution Concentration has an effect on the measurement results, but the higher the concentration, the smaller the degree of influence, so using a solution concentration as high as possible, a more stable result can be obtained.At the same time, when the concentration of the cellulose / NMMO · H2O solution is fixed, The measured relative molecular mass and its distribution corresponded to the size of the result measured by the GPC method, using the main curve of the dynamic rheological G ’and G “according to Tuminello’s” dilution hypothesis "theory Relative molecular weight distribution of cellulose; and the polydispersity index (PDI) of relative molecular mass distribution was calculated using the Wesslan function adaptation method (model function of relative molecular mass distribution).