首页> 外文期刊>Journal of Applied Polymer Science >Molecular weight and the Mark-Houwink relation for ultra-high molecular weight charged polyacrylamide determined using automatic batch mode multi-angle light scattering
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Molecular weight and the Mark-Houwink relation for ultra-high molecular weight charged polyacrylamide determined using automatic batch mode multi-angle light scattering

机译:使用自动分批模式多角度光散射法测定超高分子量带电聚丙烯酰胺的分子量和马克-霍温克关系

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摘要

This study presents an automatic batch mode (i.e., off-line) multi-angle light scattering (MALS) method for the molecular weight (MW) determination of ultra-high MW (UHMW) polyacrylamide (PAM) homopolymer and acrylamide copolymers. This method combines a MALS detector with a sample dilution and injection device that automatically delivers a concentration gradient from a stock solution. The automation makes it practical to use the batch MALS method for routine MW analysis of UHMW polymers. The automatic batch MALS analyses of a series of poly(sodium acrylate-co-acrylamide) (30:70 mol %) in 1.0M NaCl show a non-linear Mark-Houwink relation in the MW range of 1.2 X 10(6) to 12.6 X 10(6) g mol(-1). The entire molecular weight range can he tit with a quadratic relation or two linear equations, one for molecular weight up to 5.3 X 106 g mol(-1) and the other from 5.3 X 106 to 12.6 X 106 g mol(-1). The non-linear Mark-Houwink relation suggests that the extrapolation of the Mark-Houwink equation beyond the measured MW range into the UHMW regions can significantly overestimate the MW of the UHMW polymers. (C) 2016 Wiley Periodicals, Inc.
机译:这项研究提出了一种自动分批模式(即离线)多角度光散射(MALS)方法,用于测定超高分子量(UHMW)聚丙烯酰胺(PAM)均聚物和丙烯酰胺共聚物的分子量(MW)。该方法将MALS检测器与样品稀释和进样装置结合在一起,该装置可自动从储备溶液中传递浓度梯度。自动化使得将批MALS方法用于UHMW聚合物的常规MW分析变得切实可行。在1.0M NaCl中对一系列聚(丙烯酸钠-共-丙烯酰胺)(30:70 mol%)进行的自动批量MALS分析显示,分子量范围为1.2 X 10(6)至12.6 X 10(6)g mol(-1)。整个分子量范围可以用二次关系或两个线性方程式确定,一个方程式的分子量最大为5.3 X 106 g mol(-1),另一个则为5.3 X 106到12.6 X 106 g mol(-1)。非线性Mark-Houwink关系表明,将超出测量的MW范围的Mark-Houwink方程外推到UHMW区域可能会大大高估UHMW聚合物的MW。 (C)2016威利期刊公司

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