Using Ubbelohde viscometer to measure the molecular weight of polyacrylamide

Test Method: Use 85g / L sodium nitrate solution will be configured as a dilute solution sample, with Ubbelohde viscometer to determine the ultimate viscosity, according to empirical formula to calculate the molecular weight of the sample.

Reagent solution: 85g / L sodium nitrate solution

Equipment: Ubbelohde viscometer (capillary diameter 0.55mm)

Constant temperature water bath (can control 30 ℃ ± 0.1 ℃)

Stopwatch (division 0.1s)

Acid filtration funnel

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Experimental steps:

1. Determination of sodium nitrate solution outflow time

The clean, dry Ubbelohde viscometer vertically placed 30 ℃ ± 0.1 ℃ constant temperature water bath so that the U-viscometer D ball all submerged under the water.

Will be filtered through acid filtration funnel sodium nitrate solution was added to the Ubbelohde viscometer filling line between G, so far, constant temperature 10min-15min.

M tube set a hose, with the clip, use the ear ball to the sodium nitrate solution into the D ball half, remove the ear wash ball, open the M tube.

Measure the time it takes for the sodium nitrate solution to flow through the timed markers E, F with a stop watch. Repeated determination of three times, the error does not exceed 0.2s, whichever is the average t0.

2. Preparation of sample solution

Weigh 0.03 g of solid sample or equivalent amount of colloidal sample from a known 50 mL dry beaker to the nearest 0.2 mg and dissolve with sodium nitrate solution. All transferred to 100mL volumetric flask, diluted with sodium nitrate solution to the mark, shake.

3. Determine the outflow time of the sample solution

The outflow time t1 of the sample solution is determined by the first step method

4. Calculate the result according to the formula

Kent Yuan (Mr.) Hangzhou Zhongwang Technology Co., LTD. Skype: kenyuan9023   Wechat/WhatsApp:+86 15068109723E lei@zonwon.com  W www.zonwontech.com

Using Ubbelohde viscometer one-point method to determine the intrinsic viscosity

Material: a triangular flask

Two 10ml pipettes

Ubbelohde viscometer (capillary 0.5mm)

A water bath (temperature control accuracy of ± 0.1 ℃)

A stopwatch

Rubber hose two sections

A syringe

Wash the ear ball one

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step:

1, the system solution: Take a certain amount of polymer, add 10mm solvent, make it completely dissolved, if necessary, heated.

2, constant temperature: installed device, stable temperature up and down changes 0.1 ℃.

3, plus the solution balance 5min: up and down into the capillary tube three times.

4, determination: measured three sets of data, so that the deviation but 0.2s.

5, Determination of solvent flow time.

data processing:

ηr = t / t0 (t is the solution flow time, t0 solvent time)

ηsp = ηr-1

[η] = [2 (ηsp-ηr)] / C (C is the concentration unit g / ml)

[η] = (ηSP / C) c = 0 = (ln ηr / C) c = 0 [η] = KMα

Remove the pipette has been pre-heated solution 10ml, into the viscometer, the same method, the installation of viscometer, the determination of the solution outflow time t. Then followed by adding 2.00,3.00,5.00,10.00 ml of distilled water.

Kent Yuan (Mr.) Hangzhou Zhongwang Technology Co., LTD. Skype: kenyuan9023   Wechat/WhatsApp:+86 15068109723E lei@zonwon.com  W www.zonwontech.com

Various viscosity measurement formula

Kinematic viscosity: V = K * (t-Δt)

Dynamic viscosity: η = K * (t - Δt) * ρ

Limit Viscosity --- ISO 1628/1 Schulz-Blaschke formula: [η] = I / (1 + K '· I · C)

Ultimate Viscosity --- Huggins Formula: [η] = [(1 + 4KHηsp) 1/2 -1] / 2KH · C

Ultimate Viscosity --- Kraemer Formula: [η] = [1 - (1 - 4β lnηr) 1/2] / 2 β · C

Solvent-Solomon-Ciuta equation: [η] = [2 (ηsp-lnηr)] 1/2 / C

Limiting viscosity number --- Malone Maron formula: [η] = (γlnηr + ηsp) / (1 + γ) · C

The ultimate viscosity --- Dong's formula [η] = (2lnηr + ηsp) / 3 · C.

Limit Viscosity --- Billmeyer formula: [η] = (3lnηr + ηsp) / 4 · C

Limiting viscosity - Martin Martin Log I = log [η] + K [η] · C.

Limit Viscosity --- Linear Extrapolation: Measure the viscosities and logarithm viscosities of more than three different concentrations of dilute polymer solutions for linear extrapolation to determine the limiting viscosity.

Relative viscosity: ηr = (t - Δt) / (t0 - Δt0)

Viscosity number: I = (ηr-1) / C

K value for polyvinyl chloride and polyvinyl alcohol according to the Fickentscher formula: K = 1000 {a - 1 + [1 + (2 / C + 2+ a) a] 1/2} / (150 + 300C)

Where: a = 1.5 logηr

The above limit viscosity number measurement, such as the input Mark -houwink formula K, α value can be calculated viscosity average molecular weight.

M = ([η] / K) 1 / α

Gods in his heaven, all's rights with the world.

Kent Yuan (Mr.) Hangzhou Zhongwang Technology Co., LTD. Skype: kenyuan9023   Wechat/WhatsApp:+86 15068109723E lei@zonwon.com  W www.zonwontech.com

The 18th International Exhibition on Textile Industry Exhibition Invitation

We hereby sincerely invite you to visit our booth at The 18th International Exhibition on Textile Industry. 

Venue: Shanghai New International Expo Center

Hall: E3

Booth No. :  ,B21

Date: 2017．11．27 – 30
Address: 2345 Long Yang Road, Pudong, Shanghai, PR China

Main product: Viscometer, polymer dissolving machine,Pipette, Digestion reactor, Muffle furnace, Capillary tube washing machine.

Gods in his heaven, all's rights with the world.

Kent Yuan (Mr.) Hangzhou Zhongwang Technology Co., LTD. Skype: kenyuan9023   Wechat/WhatsApp:+86 15068109723E lei@zonwon.com  W www.zonwontech.com