Effects of processing on the structure of PVC/montmorillonite composites. I. Melt and solution processes



The effects of processing conditions on the structure of poly(vinyl chloride) (PVC)/clay composites were investigated. Dry-blending conditions were shown to affect composite structure in compression-molded samples. PVC/(Cloisite Na) nanocomposites could not be prepared by melt compounding. Partially exfoliated and intercalated PVC/(Cloisite 30B) nanocomposites could be prepared by melt compounding. The effects of the grain structure of PVC resin and the PVC fusion mechanism on nanocomposite formation were considered. The particulate structure of the PVC resin was found to restrict the distribution ofclay, which could be improved by increasing the processing temperature. Almost fully exfoliated PVC/(Cloisite 30B) nanocomposites were prepared from solutions in tetrahydrofuran, and the plasticizer migration resistance of these composites was substantially improved. J. VINYL ADDIT. TECHNOL., 2011. © 2011 Society of Plastics Engineers