Hi All,
I am working on dry-jet wet spinning with the cellulose-inionic liquid solutions (which named dope). After cellulose or cellulosic samples dissolved in ionic liquids, the solutions become viscous with a lot of bubbles inside. I tried with vacuum oven to get rid of bubbles in my lab (100 celsius, vacuum of 0.8-1.0 MPa, with or without stirring), but it seems it does not Work efficiently.
I am wondering do any one can suggest other ways to get rid of bubbles from such viscous solutions within 10 hours.
Best regards,
Ming
Vacuum+stirring+temperature usually works ok. The question is what You got inside bubbles - this is 'air' or maybe kind of product of chemical reaction of cellulose and something? Tip given by Michael Päch also may be useful.
Try 'SPAN' surfactants or others, use try both anionic and cationic types.
Try ultrasounds for few minutes. It works for viscous polymer solutions in ionic liquids
Dear Ming, have you find out the best option for this issue? I'm just starts working with similar project and face same problem. Will try Rafal Bielas suggestion first.
I tried many times with EMIM, the same problem. You can make degassing using Nitrogen.
The main problem with me now is, how to cross-link this dissolved cellulose (IL) with other polymer (DN)
I'm curious about dope viscosity. It shouldn't be that high if you want to try dry-jet and filtration can only remove fine particles. I work on PAN, lignin and pitch products on pilot scale and to remove bubbles, I keep temperature high (~60C) and try high vacuum chamber, directly connect to a vacuum pump, not a building vacuum. I've been doing this for almost 6 years and have never seen any problems with bubbles.