This depends on the polymer matrix. If thermoplastic, dissolving it in the relevant solvent is preferable. If thermoset, burning it will be required but at as low temperature as possible for not modifying and/or sintering the clay.
One of the possible ways to mill his composite in to fine powder 100-150 µm, add it to raw clay and fired it with aim to obtain porous clay structures (granules). The organic component will burn out, making pores, but clay is remain in material.
My first idea was to firstly propose you to try the direct mechanical recycling of PP-PA nanocomposites… In my opinion this method has some advantages and it usually applied, thus you will find more information in the literature.
But, from the key-words, it comes out that you are more interested to do the chemical recycling of these nanocomposites (i.e., PP/PP-g-MAH/polyamide/clay). You did not specify the type of polyamide, I assume that is PA 6 (it is traditionally blended with PP), but it can be PA 6,6.
In this context, please consider as one possibility, firstly the depolymerization of polyamide 6 into its oligomers/monomer= caprolactam by acidolysis, aminolysis, hydrolysis or catalyzed depolymerization, etc. (e.g. by thermally cracking with steam, heating at high temperature (300°C) in presence of phosphoric acid).
In the following steps, we must to do the separation of PP from the solution containing caprolactam and its oligomers.
Then, it is needed to consider the recovering of monomer (caprolactam), and to find the best method to do the chemical recycling of PP (e.g., by pyrolysis, other techniques), methods that will be by proposed to you also other RG colleagues.
If you are referring to PA 6,6 the chemical recycling to obtain adipic acid and HMD (hexamethylene diamine) is less applied, due to poor economics of the process. Your objective is complex, so good luck in your R&D study,
Marius
PS: I will attach for eventual help some sources of information…