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
The company is located in:
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.
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