2. Methodology
2.1. Materials
Polypropylene (PP, Mophen HP525N; melt flow index (MFI) 11 g/10 min, density 0.90 g/cm3) was obtained from HMC Polymers Limited (Thailand). Calcium carbonate (CaCO3, purity > 98%, density 2.7-2.95 g/cm3) was supplied by Polyine CO., Ltd. (Thailand). Sodium hydroxide (NaOH) was supplied by Ajax Finechem Pty Ltd. (New Zealand). Palmitic acid (PA) was supplied by Sima-Aldrich Pte Ltd. (Germany).
2.2. Preparation of modified calcium carbonate
The CaCO3 was dried at 60