Figure 1a.  Short-glass-fiber-reinforced homo-polypropylene.  Conventional fiber sizing composition.  SEM micrograph of the (tensile) fracture surface (average fiber diameter = 13 µm).

Figure 1b.  Short-glass-fiber-reinforced homo-polypropylene.  Novel fiber sizing composition.  SEM micrograph of the (tensile) fracture surface (average fiber diameter = 13 µm).

Figure 2a.  Short-glass-fiber-reinforced modified polypropylene (modified polypropylene: homo-polypropylene + acrylic acid-grafted polypropylene blend; overall acrylic acid content = 0.3 wt %). Conventional fiber sizing composition.  SEM micrograph of the (tensile) fracture surface (average fiber diameter = 13 µm).

Figure 2b.  Short-glass-fiber-reinforced modified polypropylene (modified polypropylene: homo-polypropylene/acrylic acid-grafted polypropylene blend; overall acrylic acid content = 0.3 wt %).  Novel fiber sizing composition.  SEM micrograph of the (tensile) fracture surface (average fiber diameter = 13 µm).

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