Influence of the presence of medium-soft paraffin wax on the morphology and properties of iPP/silver nanocomposites

Molaba, M.P.; Dudić, Duško; Luyt, A. S.

doi:10.3144/expresspolymlett.2015.82

Cited by 10 publications

(11 citation statements)

References 19 publications

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“…Some authors reported that the blending of PP with low molar mass paraffinic waxes was homogeneous on a macroscopic scale up to wax concentrations of about 5 to 10 wt%, which is consistent with the assumption that PP and PE oligomers are at least partially miscible in the melt . However, the mechanisms leading to the saturation of the polymer phase and causing the observed variations in the viscosity reduction effect were not further investigated in the scope of this study.…”

Section: Resultssupporting

confidence: 83%

Rheology and crystallization behavior of polypropylene and high‐density polyethylene in the presence of a low molar mass polyethylene

Michael

Fulchiron

Cassagnau

2019

Polymer Crystallization

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The rheological behavior and crystallization behavior of high density polyethylene (HDPE) and polyethylene (PE) oligomer (HDPE/PE oligomer) and polypropylene (PP) and polyethylene oligomer (PP/PE oligomer) binary blends were investigated in this study. Batch processing along with rheological model experiments revealed that molecular diffusion is the dominating mechanism in the homogenization of such blends. Further rheological characterization and modeling (using the Carreau‐Yasuda equation) allowed to demonstrate that the PE oligomer is miscible in both polymers, but that saturation may occur at high concentrations. Thermal analysis as well as polarized light and electronic microscopy showed that both systems undergo solid‐liquid phase separation upon cooling, with direct consequences on the mechanical properties of the blends. The concentrations at which saturation (in the melt), phase separation (upon cooling), and degradation of the mechanical properties occur were found to be dependent on the nature of the polymer; around 20 to 30 wt% for HDPE and 5 to 10 wt% in the case of PP.

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Section: Resultssupporting

confidence: 83%

Rheology and crystallization behavior of polypropylene and high‐density polyethylene in the presence of a low molar mass polyethylene

Michael

Fulchiron

Cassagnau

2019

Polymer Crystallization

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“…Still, values at 5 wt% were higher than the pure iPP/wax, while the highest enhancement was obtained for a loading of 4 wt% of Ag nanoparticles. The measured thermal conductivity ratios of silver-based nanostructure-enhanced PCM at room temperature as a function of the mass fraction of the nanoparticles reported by others [16][17][18][19] and a typical data from present study [14] are plotted in Figure 2 The data of Molaba et al [19] and Al Ghossein [14] are banded similarly and will be discussed further below.…”

Section: Prior Research Studies On Pure Eicosane and Silver Nano-strumentioning

confidence: 54%

“…Comparison of the figure of merit among present study (Ag nanofillers), Ag nanoparticles of Molaba et al [19] and CuO nanoadditives of Nabil [11] for NePCM composites prepared following the room temperature solidification route along with the limit of the…”

Section: Rastorguevmentioning

confidence: 98%

“…CuO nanoparticles (Nabil [11]) as a function of the mass fraction of the nano-structures, is illustrated in Figure 15. Ideally, for highly conductive nanofillers (  ) and small volume fractions, the limit of the [19] are in the range of 35-55 and exhibit a trend of a maximum around a value of 3.5 wt% compared to 2 wt% reported by Nabil [11] and Al Ghossein [14].…”

Section: The Figure Of Merit That Quantifies the Value And Importancementioning

confidence: 99%

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Experimental determination of temperature-dependent thermal conductivity of solid eicosane-based silver nanostructure-enhanced phase change materials for thermal energy storage

Ghossein

Hossain

Khodadadi

2017

International Journal of Heat and Mass Transfer

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Thermal conductivity of eicosane-based phase change materials was enhanced by suspending highly-conductive silver nanoparticles. Three batches of solid eicosane-silver samples with mass fractions (0, 1, 2, 3.5, 5, 6.5, 8 and 10 wt%) of nanoparticles were obtained under three different solidification routes: ice-water bath, room temperature and oven solidification. The transient plane source technique was used to measure the thermal conductivity at different temperatures starting at 10 °C and ending close to the melting point of each sample. Results showed an increase in the value of thermal conductivity as the temperature increased, and when close to melting point, a sharp rise in thermal conductivity was observed. Also, the oven solidification route samples exhibited the highest values while the ice-water samples showed the least increase.For samples with an additive loading greater than 2 wt%, a non-monotonic relationship was obtained between the thermal conductivity and the weight fraction of Ag nanoparticles, 2 regardless of the method of solidification. In addition to thermal conductivity measurement, the latent heat of fusion of the samples was investigated, utilizing differential scanning calorimetry.Results exhibited a decrease in the latent heat and the melting point of the samples as the additives loading increased due to the decrease in the number of molecules of eicosane in the samples.

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“…During the phase change process, the intramolecular interactions of PW collapsed, contributing to the change in the crystallinity and crystallization temperature of the blends . Additionally, the short chains of PW will also increase the free volume in the amorphous phase of the PLA matrix, which will give rise to higher chain mobility . Similarly, the LLDPE also served as nucleating agent in the PLA matrix and facilitating the rearrangement of the chains so that the crystallinity increased.…”

Section: Resultsmentioning

confidence: 99%

Improving the processibility and mechanical properties of poly(lactic acid)/linear low‐density polyethylene/paraffin wax blends by subcritical gas‐assisted processing

Chen

Ellingham

et al. 2018

Polymer Engineering & Sci

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Previous studies have shown that paraffin wax (PW) is capable of improving the ductility and fluidity of poly(lactic acid) (PLA) matrices. However, PLA and PW are immiscible, thus the low melting temperature of PW (at around 558C) will pose some processing difficulties and/or practical application limitations on PLA/PW blends. Since linear low-density polyethylene (LLDPE) and PW exhibited miscibility at a 90%/10% weight ratio and a melting temperature of 1238C, LLDPE was added to the PLA/PW blends in order to increase their thermal stability, processability, and elongation-at-break. The blends were prepared by a twin-screw extruder using two different melt compounding processes: conventional melt compounding extrusion and subcritical gas-assisted processing. Then, neat PLA, LLDPE, and the blends were injection molded into tensile bars for evaluation. To observe the effects of the two melt compounding processes, the thermal properties, mechanical properties, and phase morphologies of the various blends were characterized. The physical foaming agent (nitrogen, N 2 ) used in the subcritical gas-assisted processing process also plasticized the melt, thereby reducing the likelihood of thermal degradation and improving the mixing performance. POLYM. ENG. SCI., 00:000-000, 2018.

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Influence of the presence of medium-soft paraffin wax on the morphology and properties of iPP/silver nanocomposites

Cited by 10 publications

References 19 publications

Rheology and crystallization behavior of polypropylene and high‐density polyethylene in the presence of a low molar mass polyethylene

Rheology and crystallization behavior of polypropylene and high‐density polyethylene in the presence of a low molar mass polyethylene

Experimental determination of temperature-dependent thermal conductivity of solid eicosane-based silver nanostructure-enhanced phase change materials for thermal energy storage

Improving the processibility and mechanical properties of poly(lactic acid)/linear low‐density polyethylene/paraffin wax blends by subcritical gas‐assisted processing

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