Improving the mechanical and thermal properties of chlorinated poly(vinylchloride) by incorporating modified CaCO3nanoparticles as a filler

Abstract

Chlorinated poly(vinyl chloride) (CPVC)/calcium carbonate nanocomposites were successfully prepared by the incorporation of calcium carbonate (CaCO 3) nanoparticles into the CPVC matrix. The compatibility between the two phases was obtained by surface modification of the CaCO 3 nanoparticles with stearic acid, leading to improved material performance. The effects of the addition of different amounts of CaCO 3 nanoparticles to the CPVC on the thermal, mechanical, and morphological characteristics of the CPVC/CaCO 3 nanocomposites were investigated. The thermal stability of the CPVC/CaCO 3 nanocomposites was evaluated by thermogravimetric analysis and differential scanning calorimetry. In addition, the surface texture of the CPVC and the dispersion of the CaCO 3 were evaluated using scanning electron microscopy. Important enhancements in the thermal and mechanical properties of the modified CPVC/CaCO 3 nanocomposites were obtained by incorporating different amounts (2.00%, 3.75%, and 5.75%) of surfacemodified CaCO 3 nanoparticles within the CPVC polymer matrix. The results reveal that 3.75% of CaCO 3 was the optimum amount, where the CPVC/CaCO 3 nanocomposite shows the highest impact strength, the highest tensile strength, the highest thermal stability, and the lowest elongation percentage. Replacement of the commercial impact modifier used in industry with the prepared surface-modified CaCO 3 nanoparticles for the development of CPVC was successfully achieved.

Effect of calcium carbonate particle size and content on the thermal properties of PVC foamed layer used for coated textiles

“…Calcium carbonate is one of the most widely used fillers for the PVC leather industry [ 14 – 16 ], conventionally CaCO 3 has been employed to minimize its cost and enhance its melting viscosity, and mildly increase the modulus of the final product due to its small surface area and undesirable geometrical aspects [ 17 ]. However, some mechanical properties remained constant or, in some circumstances, declined [ 18 ].…”

“…Other studies have shown that CaCO 3 particle size and content have a significant effect on the morphological structure [ 17 , 21 , 22 ], the thermal characteristics [ 16 , 23 , 30 ], and the physical properties of the PVC products [ 17 , 21 ].…”

Nükleer Reaktörlerde Nanoparçacık Olarak Kalsiyum Karbonat Kullanımının Araştırılması

“…Some of the studies examining the mechanical properties of materials and making mechanical improvements are as follows. In one of these studies; by preparing nanocomposites containing calcium carbonate, the thermal, mechanical and morphological properties of these composites were investigated [5]. As a result of the examination, the researchers concluded that the CaCO3 ratio was 3.75%, where the nanocomposite used showed the highest impact and tensile strength.…”