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Prediction of molecular weight distribution of cellulose by using the rheological method

机译:流变法预测纤维素的分子量分布

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In this article, a rheological method that can predict the molecular weight distribution (MWD) of polymer was introduced. Using this method, the MWDs of four cellulose samples were compared from rheological data of the cellulose / N-methyl morpholine N-oxide (NMMO) / H2O solutions. The MWDs of cellulose also were determined by gel permeation chromatography (GPC) calibrated with narrow distribution polystyrene standards, using 0.5% lithium chloride (LiCI) in N,N-dimethylacetamide (DMAc) as the eluent. Comparison of the results from rheology and GPC showed that the MW and MWD of cellulose could be roughly inferred from their rheological data. Although the differential MWD obtained from the rheological method was bell shaped and can not reflect the fine characteristics of cellulose as GPC, it may be feasible to compare the MWDs of cellulose by using the rheological method. (C) 2004 Wiley Periodicals, Inc.
机译:本文介绍了一种可以预测聚合物分子量分布(MWD)的流变方法。使用该方法,从纤维素/ N-甲基吗啉N-氧化物(NMMO)/ H2O溶液的流变数据比较了四个纤维素样品的MWD。纤维素的MWD值也可以通过凝胶渗透色谱法(GPC)进行测定,该色谱法使用窄分布的聚苯乙烯标准品进行校准,使用0.5%氯化锂(LiCI)的N,N-二甲基乙酰胺(DMAc)溶液作为洗脱液。流变学和GPC结果的比较表明,纤维素的MW和MWD可以从其流变学数据中大致推断出。尽管通过流变方法获得的微分MWD为钟形,不能反映纤维素作为GPC的优良特性,但使用流变方法比较纤维素的MWD可能是可行的。 (C)2004年Wiley Periodicals,Inc.

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