How to Convert UL Viscosity into Polyacrylamide in Polyacrylamide Explains how to convert UL viscosity in polyacrylamide into molecular weight Description Recently, a friend asked how the UL viscosity in our polyacrylamide flocculant was converted into Molecular weight? What is the role of cationic polyacrylamide ion degree? For the first question, we first look at the relationship between the viscosity and molecular weight of polyacrylamide, polyacrylamide solution is very viscous, the higher the molecular weight of the higher polyacrylamide solution viscosity, this is because polyacrylamide Macromolecules are thin, long chain bodies that have great resistance to movement in solution. The essence of the viscosity reflects the size of the friction within the solution, also known as the coefficient of friction. The viscosity of all kinds of macromolecular organic solution is higher, and increases with the increase of molecular weight. One method for determining the molecular weight of a polymer is to determine the viscosity of the solution at a given concentration under certain conditions and then calculate the molecular weight according to a certain formula, which is called the "putative molecular weight." Specific methods - polyacrylamide molecular weight measurement is as follows: Dry powder sampling: Accurately weigh 0.027g ~ 0.04g dry powder into a 250ml beaker, and then add 200ml of pure water .30 ℃ ~ 35 ℃ under the conditions of stirring 1.5 ~ 2h. Dissolved, transferred to 250ml volumetric flask, and then rinse the beaker several times, rinse the water is also transferred to the volumetric flask, dilute to the mark, shake, (from 20 minutes to 30 minutes) and then shake the flask from 50ml solution, transferred to 100ml volumetric flask, plus 2N NaNo3 (sodium nitrate) solution 50ml, and then shake again 5 to 10 minutes, with a dry glass funnel filtration, take 15 ~ 20ml transferred to a viscometer Viscometer). Place in a water bath at 30 ° C ± 0.05 ° C. Measure the solution flow-out time at 10 min. Take the average of three times as t (ie seconds). Calculation formula of molecular weight (simple) Running seconds ÷ blank equal to the number-m (natural logarithm) -1 = × 2 Press the square button ÷ weight ÷ solid content ÷ 0.2 ÷ 03.73 × 1000 = Press the function conversion key Press YZ Press 0.66 - molecular weight. The polyacrylamide solution intrinsic viscosity [η] and its molecular weight m between the following exponential function: [η] = 3.73 × 10-4 × m 0.66 Experience shows that the polyacrylamide flocculation performance and its solution viscosity Direct relationship, the higher the viscosity, the better the performance, that is, the higher the molecular weight of polyacrylamide product performance is better; if its viscosity is reduced by some factors, its flocculation performance will inevitably decline. However, there are a lot of macromolecular flocculants on the market which have high viscosity but poor flocculation effect, which is related to many factors and will not be described in detail here. This article information from the filter water purification from http://www.gyzhenyu.com finishing release.