Thermo gravimetric analysis (TGA) of PA6/G and PA6/GNP composites using two processing streams

Umar, Muneer; Ofem, Michael Ikpi; Anwar, Auwal Sani; Salisu, A.

doi:10.1016/j.jksues.2020.09.003

Cited by 15 publications

(10 citation statements)

References 36 publications

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“…This trend complies with the literature. 53–55,60 Since carbon materials are inherently brittle, this reduction can be attributed to the presence of rigid and brittle 2-D phase GNPs which can lead to restriction in the polymer chain movement. 55 Another explanation is that graphene nanoparticles or any other nano-reinforcement can act as stress concentration sites leading to failure without prior ductility.…”

Section: Resultsmentioning

confidence: 99%

“…Previous work on assessing the shore hardness of polymer composites reported slight increase which was attributed to the high surface area and dispersion of the reinforcement phase. 48–50 Incorporating GNPs in polymeric materials have been seen to lead to an increase 35,51,52 and reduction 45,53–55 in tensile properties. Yesildag et al.…”

Section: Introductionmentioning

confidence: 99%

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Functionalised graphene effect on the mechanical and thermal properties of recycled PA6/PA6,6 blends

Korkees

Aldrees

Barsoum

et al. 2021

Journal of Composite Materials

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Limiting the generation of polymers waste and maximizing their recyclability and recovery have been the main focus of the research and industry in recent years. Recycling of polyamides leads to the loss in mechanical and thermal properties, therefore, in order to reuse recycled nylons, an enhancement in their properties is desired. Enhancing the properties of recycled polyamides by the addition of functionalised graphene nanoparticles (GNPs) was the goal of this study. Recycled PA6/PA6,6 blends and functionalised graphene nanocomposites were prepared using hot-melt extrusion process. Two types of functionalised graphene were used: O2-GNPs and Amine-GNPs. The nanofillers didn’t affect the crystallinity of the recycled nylon, while the presence of functionalised graphene increased the thermal conductivity by enabling better heat transfer routes within the polymer. The microstructure of the materials was characterised confirming the successful dispersion but with a slight variation in GNPs/Polymer bonding depending on the functionalisation type. The strong nylon-to-graphene interfacial hydrogen bonding increased the mechanical properties of the recycled nylon nanocomposites. The functionalised nanoparticles slowed down the segmental motion of the polymer chain and decreased the ductility with increasing GNPs contents up to 10 wt%. The overall behaviour of recycled nylon nanocomposites showed dependency on the type of functionalisation and concentration of GNPs with better improvement in the overall properties using 2 wt% Amine-GNPs. These enhanced properties make functionalised graphene/recycled nylon nanocomposites a promising new class of advanced materials.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Functionalised graphene effect on the mechanical and thermal properties of recycled PA6/PA6,6 blends

Korkees

Aldrees

Barsoum

et al. 2021

Journal of Composite Materials

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“…A TGA analysis was also carried out to compare possible variations in the degradation peaks of the dyes [ 79 , 80 , 81 ]. To perform the characterization of the thermal properties of the hybrids, in this study, a thermogravimetric analyzer TGA/SDTA 851 (Mettler-Toledo Inc., Columbus, OH, USA) was used.…”

Section: Methodsmentioning

confidence: 99%

The Optimal Concentration of Nanoclay Hydrotalcite for Recovery of Reactive and Direct Textile Colorants

López-Rodríguez

Micó-Vicent

Bonet-Aracil

et al. 2022

IJMS

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Concerns about the health of the planet have grown dramatically, and the dyeing sector of the textile industry is one of the most polluting of all industries. Nanoclays can clean dyeing wastewater using their adsorption capacities. In this study, as a new finding, it was possible to analyze and quantify the amount of metal ions substituted by anionic dyes when adsorbed, and to determine the optimal amount of nanoclay to be used to adsorb all the dye. The tests demonstrated the specific amount of nanoclay that must be used and how to optimize the subsequent processes of separation and processing of the nanoclay. Hydrotalcite was used as the adsorbent material. Direct dyes were used in this research. X-ray diffraction (XRD) patterns allowed the shape recovery of the hydrotalcite to be checked and confirmed the adsorption of the dyes. An FTIR analysis was used to check the presence of characteristic groups of the dyes in the resulting hybrids. The thermogravimetric (TGA) tests corroborated the dye adsorption and the thermal fastness improvement. Total solar reflectance (TSR) showed increased radiation protection for UV-VIS-NIR. Through the work carried out, it has been possible to establish the maximum adsorption point of hydrotalcite.

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“…Details experimental procedure for making the composites can be found elsewhere [9]. Since storage modulus is obtained using Dynamic Mechanical and Thermal Analysis (DMTA).…”

Section: Methodsmentioning

confidence: 99%

Evaluating Storage and Effective Moduli of In Situ Polymerised and Melt Extruded PA6 Graphite (G) Composites

Umar

Ofem

Anwar

et al. 2021

JMEST

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Four PA6/graphite (G) composites systems were made. Two using in situ polymerisation equivalent in mixing strain and two systems melt extrusion of equivalent processing strain. The effective modulus of the carbons, room temperature storage modulus and storage modulus at 80 ⁰C were evaluated. The composite/unfilled PA6 ratios at E25 and that at E80 for the in situ polymerised system IG 40/10 are 1.37 and 1.63, respectively. For the in situ polymerised system IG 20/20, the same were 1.96 and 2.28, respectively. For the melt-extruded systems, G 100/6 had the best E25 ratio of 1.67 and E80 of 2.03, whereas the same for G 200/3 system were respectively 1.87 and 2.64. While the better storage modulus properties exhibited by IG 20/20 in the in situ polymerised system is associated with a better filler connectivity network that enhanced heat dissipation. The better values shown in the G 200/3 melt-extruded system is associated with the lesser extrusion, which significantly reduced the tendency to thermal decay. Effective modulus for the in situ polymerised systems IG 40/10 and IG 20/20 were 7.5GPa and 8.9GPa while that of melt-extruded systems G200/3 and G100/6 tallied at 8.2 GPa.

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Thermo gravimetric analysis (TGA) of PA6/G and PA6/GNP composites using two processing streams

Cited by 15 publications

References 36 publications

Functionalised graphene effect on the mechanical and thermal properties of recycled PA6/PA6,6 blends

Functionalised graphene effect on the mechanical and thermal properties of recycled PA6/PA6,6 blends

The Optimal Concentration of Nanoclay Hydrotalcite for Recovery of Reactive and Direct Textile Colorants

Evaluating Storage and Effective Moduli of In Situ Polymerised and Melt Extruded PA6 Graphite (G) Composites

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