The relationship between MWCNT dispersion and agglomerate size with the screw profile employed during mixing of MWCNTs and a PP in a twin‐screw extruder is investigated. Five screw configurations are designed based on an initial concept of forward conveying and kneading block elements and varying a number of other elements. A screw profile having a toothed mixing element and one reverse conveying element (S3) after the mixing zone is most effective at breaking down MWCNT primary agglomerates. Addition of a second and third reverse conveying element increases the practical residence time but promotes MWCNT re‐agglomeration. A screw profile with just forward conveying and kneading block elements (S1) yields the most uniform MWCNT dispersion.
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Mayoral et al. (2013) studied this question.
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