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首页> 外文期刊>Journal of Applied Polymer Science >PREPARATION AND VISCOSITY BEHAVIOR OF HYDROPHOBICALLY MODIFIED POLY(VINYL ALCOHOL) (PVA)
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PREPARATION AND VISCOSITY BEHAVIOR OF HYDROPHOBICALLY MODIFIED POLY(VINYL ALCOHOL) (PVA)

机译：疏水改性的聚乙烯醇（PVA）的制备和粘度行为

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摘要

In this study, a novel series of water-soluble hydrophobically modified poly(vinyl alcohol) (PVA) is prepared by chemical modification of PVA, with the objective of investigating the polymer's theological behavior for enhanced oil recovery applications. The solution viscosity of the polymer obtained is studied with respect to the polymer concentration, temperature, salinity, polymer modification, aging, shear rate, and polymer molecular weight. The solution viscosity of the PVA is greatly enhanced by the modification. The modified PVA exhibits a relatively high salt tolerance, typical of nonionic polymers, in the range of 0-7.0 wt % NaCl concentrations, and the viscosity of the polymer solution is relatively invariant with NaCl above 3.0 wt % NaCl concentration. Below 3 wt %, the viscosity shows a maximum then a minimum, an unusual behavior. Generally, the polymer exhibits an almost constant viscosity at high shear rates and a typical shear thinning behavior at low shear rates. In addition, increasing polymer concentration and molecular weight leads to an increase in the polymer solution viscosity. Moreover, the polymer exhibits smaller solution viscosity at a high temperature, and a slight decrease in viscosity is also exhibited by the modified polymer with aging. Comparison of the viscosities of 18 polymer modifications indicates that the larger the numbers of hydrophobic groups (side chains) in the polymer structure, the smaller the viscosity. Moreover, the longer the hydrophobic groups (side chains) in the polymer structure, the greater the viscosity, if their number is small. (C) 1995 John Wiley & Sons, Inc. [References: 21]
机译：在这项研究中，通过对PVA进行化学改性，制备了一系列新型的疏水改性的聚乙烯醇（PVA），目的是研究聚合物在提高采油率方面的流变行为。关于聚合物浓度，温度，盐度，聚合物改性，老化，剪切速率和聚合物分子量，研究得到的聚合物的溶液粘度。通过改性，PVA的溶液粘度大大提高。改性的PVA在0-7.0重量％的NaCl浓度范围内表现出相对高的耐盐性，这是非离子聚合物所典型的，并且聚合物溶液的粘度对于高于3.0重量％的NaCl浓度的NaCl是相对不变的。低于3wt％，粘度显示出最大然后最小的异常行为。通常，聚合物在高剪切速率下表现出几乎恒定的粘度，而在低剪切速率下表现出典型的剪切稀化行为。另外，聚合物浓度和分子量的增加导致聚合物溶液粘度的增加。而且，该聚合物在高温下表现出较小的溶液粘度，并且随着时间的过去，该改性聚合物还表现出粘度的轻微降低。 18种聚合物改性物的粘度比较表明，聚合物结构中疏水基团（侧链）的数目越大，粘度越小。此外，聚合物结构中的疏水基团（侧链）越长，如果其数目少，则粘度越大。 （C）1995 John Wiley＆Sons，Inc. [参考：21]

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