Structure and Properties of Polypropylene/Hydrotalcite Nanocomposites

摘要

This article presents the study of the modification of the particle/matrix interface region and its effects on the structure and dynamic mechanical behavior of polypropylene (PP)/hydrotalcite nanocomposites prepared by melt extrusion. The interface modification was promoted by combinying the organophillization of the hydrotalcite particles with blending the PP with a ma-leic anhydride-grafted-PP (PP-g-MAH) or a maleic anhy-dride-grafted-poly(styrene-co-ethylenebutylene-co-sty-rene) (SEBS-g-MAH). Sodium dodecyl sulphate was used to promote the organophillization of the hydrotalcite particles. X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed a partially exfoliated hydrotalcite structure, with an increasing exfoliation being achieved by adding a compatibilizer and organo-modifying the particles. Values of the Young's modulus (E), storage modulus (E'), maximum tensile strength (σ_(max)), neck propagation strength (σ_(neck)), and elongation at break (ε_b) were found to depend both on the nature of the particle matrix interface as well as on the type of compatibilizer. Also, nanocomposites prepared with the organophillized particles showed lower T_g and loss factor values.