Preparation of anhydrous micron CaSO4 with different morphologies from phosphogypsum and its reinforcing in polyvinyl chloride

•Three morphologies of CaSO4 were prepared in a sulfuric acid solution system.•The effect of filler morphologies on PVC composite mechanical properties was studied.•The CSA-short columnar/PVC has better comprehensive mechanical properties. Using phosphogypsum as raw material, granular-, plate- and s...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Construction & building materials 2023-02, Vol.365, p.130126, Article 130126
Hauptverfasser: Xu, Li, Fang, Keneng, Bi, Yongxiang, Yang, Min, Chen, Qianlin
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:•Three morphologies of CaSO4 were prepared in a sulfuric acid solution system.•The effect of filler morphologies on PVC composite mechanical properties was studied.•The CSA-short columnar/PVC has better comprehensive mechanical properties. 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.
ISSN:0950-0618
DOI:10.1016/j.conbuildmat.2022.130126