nanoparticles

Do they start with the same viscosity (MW) polymer and 1. adding the nanoparticles increases flow, 2. adding the nanoparticles reduces wall drag? OR Start with lower viscosity polymer and improve its properties by adding the nanoparticles?

Ernie

Thanks this is very helpfull ;-))

"Rolf Wissmann" schreef in bericht news:eninng$9di$01$ snipped-for-privacy@news.t-online.com...

nanoparticles of zinc oxide and titanium dioxide have been tried in polyolefins with very little change in viscosity or melt flow at concentrations below 0.5%. However, when you add fillers you will typically increase viscosity or decrease melt flow due to the way this parameter is measured. The molten resin at 200 or 230C for PE and PP has to go through a set diameter capillary and the flow patterns of the molten resin containing nano or larger particles will inhibit flow due to the physical obstruction or pathway above the capillary. The best way to determine if you are getting changes with fillers is to run capillary rheometry studies of viscosity versus shear rate rather than a fixed relative shear rate (apparent shear rate) from a melt flow indexer.

Joe

Thanks Joe, Do you have some literature references with respect to the nano zinc and titaniumdioxide in polyolefins ?

Thanks also for the tip with respect to rheology measurement.

Mark

"magicjoe" schreef in bericht news: snipped-for-privacy@i15g2000cwa.googlegroups.com...

Not sure I understand your question?

If the reducti> Do they start with the same viscosity (MW) polymer and