An investigation into the thermal stability of PVC/montmorillonite composites

Abstract

An effective stabilizing system for poly (vinyl chloride) (PVC)/clay composites was established. Different types of stabilizers, i.e., organotin, calcium/zinc, barium/zinc, and an epoxy costabilizer, were investigated. The combination of the organotin stabilizer and the epoxy costabilizer was the most effective stabilizing system. Different grades of Cloisite nanoclays were investigated. Cloisite Na did not cause premature degradation of PVC. Cloisite 10A strongly accelerated the degradation of PVC because of the presence of excess surfactant, while a PVC/Cloisite 30B system showed much better thermal stability because there was less organic impurity in the Cloisite 30B. Phosphonium-modified clays were also prepared. They showed better thermal stability than ammonium-modified clays, but the drying conditions still need to be optimized in order to produce a dispersible clay powder.

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

“…The formulations of the PVC compounds used are shown in Table 1, as established in previous work [19]. PVC resin SH7020 with a K value of 70 was supplied by INEOS Vinyls.…”

Influence of nano-CeO2as Co-stabilizer on the thermal stabilization efficiency of novel calcium/Zinc soap stabilizers for poly(vinyl chloride)

“…In recent years, the novel nontoxic complex stabilizers with high efficiency have attracted the attention of researchers for PVC processing, including natural polyols, ester thiols, saturated polyesters, and so forth , but these organic thermal stabilizers still cannot meet the applied requirement alone. The intercalated hydrotalcite‐like materials and montmorillonite have also been reported to be used as thermal stabilizers of PVC .…”

Effect of reaction media on clay dispersion and mechanical properties in poly(butylene succinate)/organoclay nanocomposites

“…Nanocomposites have been intensively studied during recent decades, particularly clay‐containing polymer nanocomposites, because the introduction of a low amount of clay (≤5 wt%) has the potential to offer large improvements in barrier properties, thermal properties, mechanical properties, and processability, and so forth . The resulting composite mechanical properties, however, fail to meet expectations as predicted theoretically in most cases.…”