I want to know that after polymerization of PDMS and before curing,what is the phase and viscosity?Does it have some visual chacteristics which show the polymerization has happened?
I will appreciate all responses.
Dear Atefe Farahani, the following review paper deals with major features of PDMS. The simplest visualization of polymerization is the passage from liquid oil silicone to solid PDMS polymer. My Regards
https://doi.org/10.1016/j.progpolymsci.2018.06.001
From the top of my head: 1) being a polymer, PDMS unlike its monomer, it should exhibits viscoelastic properties. Try: a) pouring the mixture slowly before and after polymerization; and b) mixing with a stir bar. The difference between before and after polymerization, in these two scenarios (a and b), should be striking. 2) PDMS is insoluble in water, so you might want to see if pouring your mixture in water results in phase separation. Other than that, as per Wikipedia: "PDMS is optically clear".
To delve into more technical aspects, a good starting point could be:
"Viscoelastic and optical properties of four different PDMS polymers" Shinji Deguchi et al 2015 J. Micromech. Microeng. 25 097002 DOI:10.1088/0960-1317/25/9/097002
Best regards
Thank u all.I think that the phase of PDMS is liquid after polymerization and elasticity happens after curing.I just want to know whether the liquid is oily or aquatic?
And how much is the difference between viscosity before and after curing?
It depends on the molecular weight. Low MWs are viscous Oils, but the high MWs ones solids.
Hi;
The viscosity changes from monomer to polymer. Depending on its degree of polymerization, it can be as liquid as water or as a gum. Its density also increases according to its molar mass. Please check the following document.
With my best regards
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