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ZnAl-LDH(layered double hydroxide) (Zn:Al=2:1 mole ratio) modified with stearic acid (SA) or oleic acid (OA) was synthesized by a coprecipitation method and compounded to SAN polymer at various contents. All the SAN composites were manufactured by a co-rotating twin-screw extruder and subsequently injection molded into several specimen. Morphology, transparency, and thermal resistance of these composites were evaluated by TEM, XRD(X-ray diffractometry), UV-Vis spectrophotometry, and thermogravimetric analysis. SAN nanocomposites containing OA-Zn2Al LDH showed better optical transmittance than SAN nanocomposites containing SA-Zn2Al LDH. All the SAN nanocomposites containing OA-Zn2Al LDH or SA-Zn2Al LDH exhibited improvement of thermal resistance at second stage of thermal oxidation. These results were explained by the fact that the interaction between organic modifier and polymer performed an important role in the property improvement of polymer nanocomposites.

Morphology, Transparency, and Thermal Resistance of SAN Nanocomposites Containing Organically Modified Layered Double Hydroxides