I am doing a sutdy about Carbon Nanomaterials in High Density Polyethylene, but its MFI is too low (0.4 g/10 min). Do anyone know any aditve such as an internal lubricant than could increase this MFI Value?
Dear Juan Mercadal-Guillén, MFI is a direct reflection of MW. So, better will be to use low MW grade HDPE, or to systematically proceed to mechanical degradation of your HDPE. The use of internal lubricant will produce post-processing problems. Please have a look at these old RG threads and the other documents. My Regards
https://www.researchgate.net/post/How-can-we-increase-polyethylenes-MFI-in-an-extruder-without-any-lubricant
https://www.researchgate.net/post/Is-it-possible-to-change-the-MFI-increase-or-decrease-of-Polyolefins-PE-PP
https://doi.org/10.1002/polc.5070570103
https://doi.org/10.1179/2055033215Y.0000000012
Dear Juan,
For practical reasons and to facilitate your work, my suggestion is to look to a new HDPE grade characterized by high fluidity/MFI! There are so many producers (LyondellBasell, SABIC, Dow Chemical, Ineos, ExxonMobil, Total Petrochemicals, Braskem, etc.), and you can do a choice. Even that we have not all information about the goal of your research, please consider that the nanofillers, such as CNT, CB, others. can increase additionally the melt-viscosity of your blends.
Of course you can increase the temperature of melt-processing, or slightly decrease the viscosity adding some lubricants (https://polymer-additives.specialchem.com/selection-guide/lubricants ), but it will not be dramatically improvements.
Good luck in your research and best regards,
Marius
Dear Juan
To increase the mfi of PE, you could try to add some peroxide agent to cut the polymer chain. but it would change the properties of the materials.
Sincerely ...
Dear all, treating HDPE with peroxides introduces chains crosslinking more than scission, or at least introduces branching. This means that the MFI will even gets lower, in addition to the loss of major mechanical properties. My Regards
https://doi.org/10.1016/S0142-9418(99)00048-3
- Badges
- Science topic