The best idea is to graft something into the surface of the nanofiber to increase bioopolymer-nanofiller compatibility and avoid nanofibers liking each other. Are you useing melt compounding or solvent casting?

thank you so much for your attention mr Trifol,

I want using melt compounding method, but at first i want making a master batch with using slvent casting (maybe with poly ethlene glycol (PEG) and PLA-nano fiber and then produce nanocomposite (PLA-nano fiber) with melt compounding method.

can this way is suitable? what is your idea?

thanks.

If i have read properly you want to make CNF-PLA-PEG composite by solvent casting and after melt compound it. Thats right? My personal opinion is that could work OK, in my opinion first i would make some films using different solvents, and after at least check the dispersion by SEM to use the solvent which gives better dispersion, and after DRY CAREFULLLY (the presence of water might depolymerize the PLA) and after try to make the melt compounding, whioch definitely is not something easy for the PLA based nanocomposites. Finally i would compare the Mw of the PLA after and before the processing by SEC/HPLC to see how much the PLA has been degradated. BR, Jon.

correctly, this is my subject.

do you know a better substitute for PEG?

i suppose that this will depends on which properties do you want to improve with the adition of PEG ;).

I have been using solvent-precipitation method to improve the dispersion of different nanoparticles in PLLA matrix. Firts, I dissolve PLLA, then I add my CNC (also for ZnO nanoparticles works well) and after tip sonication for 10 minutes, I precipitate the dispersion in cold methanol. In this way PLLA traps CNC, to yield well-dispersed nanocomposite. Then, you can dry your nmaterial at 60ºC under vacuum for overnight.

I guess this may help you.

Regards,

Erlantz.

The two materials are different in characteristic, one seems hydrophobic, one hydrophilic. There are several ways to mix them. You can modify the nanocellulose surface, or using coupling agent to improve the dispersion, processing parameters also can help, etc.

One more thing you can also look at different nanocellulose morphologies, nanocellulose states. Depending on the way you dry the nanocelluloses, it could be much more difficult to disperse due to strong bond between them after drying. If you use a spray-dried or oven dried nanocellulose, you may end up lot of agglomerations.

Regards