Infact i want to to do electrospinning with polymeric mixure of pvp/pullulan ,althogh i don not know it is possible or not , to be exact whether i receive nanofibers or not?
PVP with MW of 13,00,000 will produce good NF's. The another thing is that you have to find a common solvent in which both PVP and pullulan gets dissolved.
I have not tried this. However, PVP is very easy to electrospin unlike Pullulan that's water soluble with very high surface tension.
I believe that could be done with blend of very traces on Pullulan with PVP. The other way around is to consider any chemical modifications to Pullulan by introducing aliphatic moties to the backbone by which the surface tension can be reduced to the accepted range.
infact i electrospun pvp/pull and i received nanofibers.the details of process were ratio of 60/40 as well as 75/25 , total concentration of 20% wt, voltage 14-15 ,distance 20, flow rate=0.6.
for both of them I observerd nanofibers with beads. How can I reduce the number of beads?
Following your answer, can I overcome this problem by adjusting the ratio of pvp/pull as well as increasing the total concentration from 20%? rather than the modification of pullulan?
Chemical modification of any carbohydrates is very tricky and might mislead you. If it just an article, not a dissertation, it is much easier to keep try with changing the blending ratios. for fibers will be obtained with increasing the PVP concentrations of course.