Abstract
Calcium carbonate (CaCO3) microparticles with four different morphologies, which are cubic, acicular, spindle and sphere-like, were prepared using calcium chloride (CaCl2) and sodium carbonate (Na2CO3) aqueous solutions containing various additives. High density polyethylene (HDPE)/CaCO3 composites were prepared using a HAAKE Rotational Rheometer. The thermal behaviour, mechanical properties and the rheology property were investigated and characterised by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), capillary rheometry and universal testing machine. The result shows the addition of CaCO3 to HDPE can increase the decomposition temperature and decrease the melting temperature and crystallization temperature. Sphere-like CaCO3 is the best form in improving the thermal stability and toughness of the composites; while the cubic CaCO3 can cause negative effect to the toughness.
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