I used to cast PLA film using 50ml of DCM and 5g of PLA in petri dish. But i could not find better ways to control their thickness. Is there any solution to make sure the film thickness is uniform across all casted film?
Try a spin casting technique.. In a simple way, you can mount the petri dish in a small speed controllable motor, allow it to spin at different RPM and then drop cast the solution over the spinning petridish... By controlling the RPM, ambient temperature , you might be able to control the thickness of the film..
Another method is that , you can place two parallel surfaces very close to each other separated by a spacer and then feed the polymer solution between the space between two surfaces... Hope it works.. Kindly report yours observations.. all the best..
Use a spin coater or a doctor blade (cheap method) to spread the film. Dependent on the sample viscosity, a uniform thickness can be obtained.
Another way you can try if you have access to Meyer rod. It has been been know to produce uniform thickness coating when you have a solvent based system. Follow the link,
http://www.rdspecialties.com/wirewoundrods.html
Hope this helps,
Mayur.
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