Mechanical and thermal properties of calcium carbonate-filled PP/LLDPE composite

From our previous study, natural rubber (NR) was used to improve toughness of poly (lactic acid) (PLA). Impact strength and elongation at break of PLA was increased when adding NR. Moreover, by using NR-g-GMA as compatibilizer for PLA and NR blend, impact strength and elongation at break was improved. However, tensile strength and modulus of PLA/NR blend with and without NR-g-GMA were decreased. In this study, calcium carbonate (CaCO3) and vetiver grass fiber were used as fillers in PLA/NR blend. With the addition of CaCO3 into PLA/NR blend with NR-g-GMA, impact strength and modulus of the composite were further increased with a loss in tensile strength. In contrast, the addition of vetiver grass fiber into PLA/NR blend with NR-g-GMA led to an increase in tensile strength and modulus and a decrease in impact strength and elongation at break. The onset degradation temperatures of PLA composites were lower than that of PLA and PLA/NR blend.

Download Full-text

Effect of calcium carbonate on the mechanical and thermal properties of isotactic polypropylene/ethylene vinyl acetate blends

Journal of Applied Polymer Science ◽

10.1002/app.21555 ◽

2005 ◽

Vol 96 (4) ◽

pp. 1126-1137 ◽

Cited By ~ 12

Author(s):

Mustafa Öksüz ◽

Hüseyin Yıldırım

Keyword(s):

Thermal Properties ◽

Calcium Carbonate ◽

Vinyl Acetate ◽

Isotactic Polypropylene ◽

Ethylene Vinyl Acetate ◽

Mechanical And Thermal Properties

Download Full-text

The Accelerated Aging Impact on Mechanical and Thermal Properties of Polypropylene Composites with Sedimentary Rock Opoka-Hybrid Natural Filler

Materials ◽

10.3390/ma15010338 ◽

2022 ◽

Vol 15 (1) ◽

pp. 338

Author(s):

Paulina Jakubowska ◽

Grzegorz Borkowski ◽

Dariusz Brząkalski ◽

Bogna Sztorch ◽

Arkadiusz Kloziński ◽

...

Keyword(s):

Thermal Properties ◽

Calcium Carbonate ◽

Accelerated Aging ◽

Natural Material ◽

Accelerated Weathering ◽

Mechanical And Thermal Properties ◽

Hybrid Filler ◽

Polypropylene Composites ◽

Natural Filler ◽

The Impact

This paper presents the impact of accelerated aging on selected mechanical and thermal properties of isotactic polypropylene (iPP) composites filled with sedimentary hybrid natural filler-Opoka rock. The filler was used in two forms: an industrial raw material originating as a subsieve fraction natural material, and a rock calcinated at 1000 °C for production of phosphorous sorbents. Fillers were incorporated with constant amount of 5 wt % of the resulting composite, and the material was subjected to accelerated weathering tests with different exposition times. The neat polypropylene and composites with calcium carbonate as a reference filler material were used for comparison. The aim of the research was to determine the possibility of using the Opoka rock as a new hybrid filler for polypropylene, which could be an alternative to the widely used calcium carbonate and silica. The thermal, mechanical, and structural properties were evaluated by means of differential scanning calorimetry (DSC), tensile tests, scanning electron microscopy (SEM), and Fourier-transform infrared spectroscopy with attenuated total reflectance (FTIR/ATR) prior to and after accelerated aging. As a result, it was found that the composites of polypropylene with Opoka were characterized by similar or higher functional properties and higher resistance to photodegradation compared to composites with conventional calcium carbonate. The results of measurements of mechanical properties, structural and surface changes, and the carbonyl index as a function of accelerated aging proved that Opoka was an effective ultraviolet (UV) stabilizer, significantly exceeding the reference calcium carbonate in this respect. The new hybrid filler of natural origin in the form of Opoka can therefore be used not only as a typical powder filler, but above all as a UV blocker/stabilizer, thus extending the life of polypropylene composites, especially for outdoor applications.

Download Full-text