Abstract
Using phosphogypsum as raw material, granular-, plate- and short columnar-like anhydrous micron CaSO4 were prepared in a sulfuric acid solution system under milder reaction temperatures (100 °C or 110 °C), which was used as fillers in PVC after being modified by NaOH-stearic acid. The effect of filler morphologies on PVC composite mechanical properties was studied. Through the mechanical property tests and the SEM, DMA, DSC and TG-DTG analysis, the results show that the short columnar-like anhydrous micron CaSO4 has the best compatibility and adhesion with PVC, improving PVC composites mechanical properties better than the other two. Especially, compared with pure PVC, the addition of 2 wt% modified short columnar-like anhydrous CaSO4 could well improve the comprehensive mechanical properties of PVC composites and the Tg values were increased from 57.9 °C to 61.1 °C, and at an addition of 8 wt%, the elongation at break of PVC composites was increased by 114.10%, while the thermal stability was greatly improved.
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