It is true that PMMA is soluble in DMF & in chlorobenzene but the 2 solvents differ from each other in polarity , in boiling points and in surface tension. DMF is a highly polar aprotic solvent with a boiling point of 153 oC while chlorobenzene is classified as slightly polar with a boiling point of 132 oC. You know that slightly polar molecules usually have a much lower surface tension than highly polar ones. These 3 properties will be important factors in getting uniform films by spin coating or non-uniform films together with other factors. It will be worthy to use a mixture (chlorobenzene/DMF) at different ratios to see what quality of film you will get at the same speed that you applied for each of the solvents separately.
It is true that PMMA is soluble in DMF & in chlorobenzene but the 2 solvents differ from each other in polarity , in boiling points and in surface tension. DMF is a highly polar aprotic solvent with a boiling point of 153 oC while chlorobenzene is classified as slightly polar with a boiling point of 132 oC. You know that slightly polar molecules usually have a much lower surface tension than highly polar ones. These 3 properties will be important factors in getting uniform films by spin coating or non-uniform films together with other factors. It will be worthy to use a mixture (chlorobenzene/DMF) at different ratios to see what quality of film you will get at the same speed that you applied for each of the solvents separately.
The adding of PMMA causes porous structure due to the microphase-separation structure of immiscible PMMA and PAN phases.
The adding of PMMA causes porous structure due to the microphase-separation structure of immiscible PMMA and PAN phases.
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Nizar Matar Thank you so much!. Using co-solvent (Chlorobenzene and DMF) does increase the roughness of the film as the ratio of DMF is increased.
Nizar Matar Thank you so much!. Using co-solvent (Chlorobenzene and DMF) does increase the roughness of the film as the ratio of DMF is increased.
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It is true that PMMA is soluble in DMF & in chlorobenzene but the 2 solvents differ from each other in polarity , in boiling points and in surface tension. DMF is a highly polar aprotic solvent with a boiling point of 153 oC while chlorobenzene is classified as slightly polar with a boiling point of 132 oC. You know that slightly polar molecules usually have a much lower surface tension than highly polar ones.
These 3 properties will be important factors in getting uniform films by spin coating or non-uniform films together with other factors.
It will be worthy to use a mixture (chlorobenzene/DMF) at different ratios to see what quality of film you will get at the same speed that you applied for each of the solvents separately.
It is true that PMMA is soluble in DMF & in chlorobenzene but the 2 solvents differ from each other in polarity , in boiling points and in surface tension. DMF is a highly polar aprotic solvent with a boiling point of 153 oC while chlorobenzene is classified as slightly polar with a boiling point of 132 oC. You know that slightly polar molecules usually have a much lower surface tension than highly polar ones.
These 3 properties will be important factors in getting uniform films by spin coating or non-uniform films together with other factors.
It will be worthy to use a mixture (chlorobenzene/DMF) at different ratios to see what quality of film you will get at the same speed that you applied for each of the solvents separately.
More
VOTE