The relationship between the resin and fiber properties in polypropylene long-fiber thermoplastics is further analyzed in the second part of this work. The properties of the maleic anhydride–grafted polypropylene additives (coupling agents) are studied, and correlations between the maleic anhydride content, melt flow, and base polymer are presented. Various samples of polypropylene long-fiber thermoplastic pellets (PP GLFT and PP DLFT) were compounded with various coupling agents. The materials were then molded and tested for normal mechanical properties. The results of the study are presented.

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