User:Andrew Sun/Notebook/LAOS study on physical gelation/2009/05/06

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 * style="background-color: #EEE"|[[Image:owwnotebook_icon.png|128px]] LAOS Study on Physical Gelation
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 * style="background-color: #F2F2F2" align="center"|  |Main project page


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Objectives
Effect of different molecular weights.

Samples
Gels from 5 wt% PAAc solution (Mv=44500): f=1.30e-3 (f=[Fe(III)]/[COOH])

Instrument
ARES Rheometry

Frequency Sweep
Frequency sweep result (Fig. 1 1st run) indicates that the sample was below the critical point. During LAOS experiment, the sample exhibit slight drop in stress amplitude &tau;0 with time. Comparison between frequency sweeps before and after LAOS experiment (Fig. 1) indicate minor dissociation of network in the sample.

FT-Rheology
There is hardly significant 3rd harmonics found at all strain amplitudes.


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