The nano-CaCO3/Acrylonitrile-Butadiene-Styrene (ABS) composites were prepared by
melting-blend with the single-screw extruder. The mechanical properties of the nanocomposites and
the dispersion of nano-CaCO3 were investigated by means of transmission electron microscopy
(TEM) and mechanical tests. The micro structure of the fracture section of the nanocomposites was
analyzed by means of scanning electron microscopy (SEM). The results show that not only the
impact property but also the rigidity property and the bending modulus of the system have been
increased evidently by added modificated nano-CaCO3. However, the tensile strength of the
nano-composites has a little decreased by added the modificated nano- CaCO3. The modificated
nano-CaCO3 has been dispersed well in the matrix in the nanometer scale. The micro structure of
the fracture section of the nanocomposites proved that when the composites have been impacted,
the modificated nano-CaCO3 particles have taken an action of initiating and terminating crazing
(silver streak), which can absorb more impact energy than the pure ABS resin. Compared with the
pure ABS resin material, the notched impact strength of the nano-CaCO3/ABS composites added 2
percent hundred resin (PHR) modificated nano-CaCO3 reach 36.77 kJ/m2, which have been
increased up to 44%. At the same time, the rigidity of the nanocomposites has also been enhanced
by 23.5% which is increased from 28.16N to 34.87 N.
Nanocomposites of nanosized-CaCO3/polypropylene-ethylene copolymer (PPE) and nanosized
CaCO3/ PPE/ styrene-butadiene-styrene (SBS) were prepared by using two-roll mill and single
screw extruder. The average particle size of nanosized CaCO3 was determined to be about 30 nm.
By adding nanosized CaCO3 into PPE matrix, the toughness of the matrix improves significantly. At
nanosized CaCO3 content of 12 phr (parts per hundred PPE resin by weight), the impact strength of
CaCO3/PPE at room temperature reaches 61.6 KJ/m2, which is 3.02 times that of unfilled PPE
matrix. In addition, the synergistic toughening effect of nanosized CaCO3 and SBS particles on PPE
matrix was investigated.
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