I am using HDPE and Copper Oxide Nano Particles for preparing the polymer nanocomposites using twin screw extruder. While compounding the matrix and filler, how to improve the bonding between them and what are the methods adopted for it?
Pristine CuO and HDPE will not have any chemical interactions.. treat your CuO with compatibilizers preferably some maleic anhydride moieties. and use HDPE-g-MA as compatibilizer.
Dear all,
to improve mixing or dispersion of the filler in a polymeric matrix in a twin secrew extruder you shoild first find an optimum operating condition by playing on the most effective parameters of the extruder, to quote: residance time, shear level (speed), the relative rotation of the screws to each other, temperature.
For the second part, the use of a compatiblizer is innevitable, also I think in this situation silane coupling agents may works.
There are pleinty of work and data on this topic. Regards
What is the size of your CuO nanoparticles? in a polymer, you will not achieve particle size below 60 ... 80 nm (especially not in HDPE). I can explain in more detail why if you are interested.
You may need to add some surfactant (I do not suggest to use Silanes, there is a lot of hype about these but they show poor effectiveness), e.g. Na+DBS-, Ca-Stearat or the like. Also premixing your nano powder with these additives is helpful.
PEG (PEO) might also be helpful, a powder premix again will be advantageous.
The screw setup is also important. For example kneading discs in 90° orientation enlarge the residence time distribution. As mentioned there is plenty of work on that topic.
yes, plenty of work but never quantitative. Dispersion in polymer systems is a very complicated science, most people don't dig into and only try empirically. Here are some science basics for dispersion in polymer systems:
https://www.researchgate.net/publication/229816762_Electrical_conductivity_in_heterogeneous_polymer_systems._V_%281%29_Further_experimental_evidence_for_a_phase_transition_at_the_critical_volume_concentration
https://www.researchgate.net/publication/229762491_Nonequilibrium_thermodynamical_description_of_heterogeneous_polymer_systems_%28viii%29_New_concept_for_understanding_brittletotough_transition_in_polymer_blends?ev=prf_pub
Non-equilibrium thermodynamical Theory for dispersion in polymer systems:
Part I (don't be worried it is talking about conductive polymers and their dispersion, it is generally applicable to any type of dispersion in polymer systems)
https://www.researchgate.net/publication/243347069_Dispersion-The_key_tool_for_understanding_improving_and_using_conductive_polymers_and_organic_metals
Part II
https://www.researchgate.net/publication/202290104_Critical_Shear_Rate_-_the_Instability_Reason_for_the_Creation_of_Dissipative_Structures_in_Polymers
Article Electrical conductivity in heterogeneous polymer systems. V ...
Article Non‐equilibrium thermodynamical description of heterogeneous...
Article Dispersion-The key tool for understanding, improving and usi...
Article Critical Shear Rate - the Instability Reason for the Creatio...
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