流变法测定纤维素的分子量标度及分子量分布  

Prediction of Molecular Weight Scale and Molecular Weight Distribution of Cellulose Using a Rheology-Based Method

作　　者：张慧茹[1] 刘小云[2] 李冬霜[1] 代大庆[1] 李荣先[1] 

机构地区：[1]清华大学材料科学与工程学院,北京100084 [2]华东理工大学材料学院,上海200237

出　　处：《高分子材料科学与工程》2009年第3期96-99,共4页Polymer Materials Science & Engineering

摘　　要：探索了流变法测定纤维素分子量标度及分子量分布的方法。该法认为,由Rouse期终(terminal)松弛时间公式计算得到的分子量为纤维素分子量分布中的峰值分子量(Mp),从而实现了将频率的倒数(表示相对分子量)转换为分子量标度(表示真实分子量),获得纤维素分子量标度分布曲线。将得到的结果与凝胶渗透色谱法(GPC)测定纤维素分子量及其分布的结果进行对比,对比表明,流变法与GPC法测得的Mp值非常接近,测得的多分散指数(PDI)趋势一致。因此,用流变法研究纤维素的分子量及其分布是可行的。Prediction of MW scale and MWD of cellulose by means of a theology-based method was developed. In this method, it is assumed that the cellulose MW values calculated by the Rouse terminal relaxation time can be regarded as the peak MW on the MWD curves of cellulose. Consequently, it is realized that the reciprocal of the frequency is converted to the MW scale, obtaining MWD scale curves of cellulose. Meanwhile, the obtained results were compared with those measured by the GPC method. The comparison shows that the calculated peak MW values are approximately equal, the calculated PDI values and MWD curves have the same trends. Consequently, it may be feasible to compare the MW scale and MWD of cellulose by using the rheology-based method.

关 键 词：相对分子量分布 分子量标度分布 凝胶渗透色谱法 

分 类 号：O631.21[理学—高分子化学]