Plasticization of nano‐CaCO₃ in polystyrene/nano‐CaCO₃ composites

Abstract

ABSTRACT:The shear rheological properties of polystyrene (PS)/nano-CaCO 3 composites were studied to determine the plasticization of nano-CaCO 3 to PS. The composites were prepared by melt extrusion. A poly(styrene-butadiene-styrene) triblock copolymer (SBS), a poly(styreneisoprene-styrene) triblock copolymer (SIS), SBS-grafted maleic anhydride (SBS-MAH), and SIS-grafted maleic anhydride were used as modifiers or compatibilizers. Because of the weak interaction between CaCO 3 and the PS matrix, the composites with 1 and 3 phr CaCO 3 loadings exhibited apparently higher melt shear rates under the same shear stress with respect to the matrix polymer. The storage moduli for the composites increased with low CaCO 3 concentrations. The results showed that CaCO 3 had some effects on the compatibility of PS/SBS (or SBS-MAH)/CaCO 3 composites, in which SBS could effectively retard the movement of PS chain segments. The improvement of compatibility, due to the chemical interaction between CaCO 3 and the grafted maleic anhydride, had obvious effects on the rheological behavior of the composites, the melt shear rate of the composites decreased greatly, and the results showed that nano-CaCO 3 could plasticize the PS matrix to some extent. Rheological methods provided an indirect but useful characterization of the composite structure.

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