User:Andrew Sun/Notebook/LAOS study on physical gelation/2009/05/01

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LAOS Experiment of PAAc/Fe(III) Gels

Objectives

Find the critical gel point

Samples

Gels from 5 wt% PAAc solution (Mv=51100): f=1.15e-3, 2.88e-3 (f=[Fe(III)]/[COOH])

Instrument

ARES Rheometer

Results

Frequency Sweep

Fig. 1

Frequency sweep of the two samples (Fig. 1) indicate that the critical gel point fgel lies between the f values of the two samples.

FT-Rheology

For both samples, significant signals of the 3rd harmonic were not detected under the strain range swept (50%~700%). Higher strains were not applied.