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首页> 外文期刊>Journal of Applied Polymer Science >Dependence of intrinsic viscosity and molecular size on molecular weight of partially hydrolyzed polyacrylamide
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Dependence of intrinsic viscosity and molecular size on molecular weight of partially hydrolyzed polyacrylamide

机译：特性粘度和分子大小对部分水解聚丙烯酰胺分子量的依赖性

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摘要

As a typical water-soluble polymer, ultra-high molecular weight (UHMW) partially hydrolyzed polyacrylamide (HPAM) has been widely used in various industries as thickeners or rheology modifiers. However, precise determination of its critical physical parameters such as molecular weight, radius of gyration (R-g) and hydrodynamic radius (R-h) were less documented due to their high viscosity in aqueous solution. In this work, the molecular structure of five UHMW-HPAM samples with different MW was elucidated by H-1 and C-13 NMR spectroscopy, and their solution properties were characterized by both static and dynamic light scattering. It is found that all the second virial coefficient (A(2)) values are positive and approaching zero, indicating of a good solvent of 0.5 M NaCl for UHMW-HPAM. The weight-average molecular weight (M-w) dependence of molecular size and intrinsic viscosity [eta] for these series of HPAM polymers with MW ranging from 4.81 to 15.4 x 10(6) g center dot mol(-1) can be correlated as R-g = 3.52 x 10(-2)M(w)(0.51), R-h = 1.97 x 10(-2)M(w)(0.51), and [eta] = 6.98 x 10(-4) M-w(0.91), respectively. These results are helpful in understanding the relationship between molecular weight and coil size of HPAM polymers in solution, and offer references for quick estimation of molecular weight and screening of commercial UHMW-HPAM polymers for specific end-users.
机译：超高分子量（UHMW）部分水解聚丙烯酰胺（HPAM）作为一种典型的水溶性聚合物，已广泛应用于各种工业中作为增稠剂或流变改性剂。然而，由于其在水溶液中的高粘度，精确测定其分子量、回转半径（R-g）和流体动力学半径（R-h）等关键物理参数的文献较少。在这项工作中，五种不同分子量的UHMW-HPAM样品的分子结构通过H-1和C-13核磁共振谱进行了阐明，并通过静态和动态光散射对其溶液性质进行了表征。研究发现，所有第二维里系数（A（2））均为正值，接近于零，表明0.5 M NaCl是UHMW-HPAM的良好溶剂。分子量在4.81到15.4x10（6）g中心点摩尔（-1）之间的系列HPAM聚合物的分子尺寸和特性粘度的重均分子量（M-w）依赖关系可分别关联为R-g=3.52x10（-2）M（w）（0.51）、R-h=1.97x10（-2）M（w）（0.51）和[eta]=6.98x10（-4）M-w（0.91）。这些结果有助于理解溶液中HPAM聚合物的分子量与卷曲尺寸之间的关系，并为快速估算分子量和筛选针对特定终端用户的商用UHMW-HPAM聚合物提供参考。

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