Can the strain hardening exponent be above one for a plastic product using a tensile test. ?

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Vadym Chibrikov

Good day! Maybe the following research will be helpful:

Conference Paper Effect of Plant Cell Wall Polysaccharides on Mechanical Prop...

Matthias Heck

Some members of my group designed some polymers to have a large strain hardening factor (SHF>1000). They used a rotational rheometer for their uniaxial deformation experiments on polystyrene comb polymers.

Maybe their work can help you explaining your data (Article Comb and Branch‐on‐Branch Model Polystyrenes with Exceptiona...

). It's a different system, but maybe PP chains bound to carbon black act somehow similar as PS chains bound to each other by a chemical bond.