Rheological Properties of Carbon Nanofiber-Filled Polyamide Composites and Blend of these Composites and TPE

Nishitani, Yosuke; Kitano, Takeshi

doi:10.5772/64531

Cited by 6 publications

(10 citation statements)

References 53 publications

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“…On the contrary, nanocomposites with a hybrid nanofiller system showed the highest melt viscosity value and G 0 for the lowest applied nanoparticle content. This effect was also observed for PA66 with 1% of CNF by Nishitani et al [31] and for PTT-PTMO with 0.1% of E, Young's modulus; σ y , stress at yield; ε y , elongation at yield; σ b , stress at break; ε b , elongation at break. GNP by Paszkiewicz et al [32] It is unclear which mechanism reduces melt viscosity and G 0 value for nanocomposites with a low amount of nanofiller.…”

Section: Sample A)supporting

confidence: 72%

“…On the contrary, nanocomposites with a hybrid nanofiller system showed the highest melt viscosity value and G′ for the lowest applied nanoparticle content. This effect was also observed for PA66 with 1% of CNF by Nishitani et al [ 31 ] and for PTT–PTMO with 0.1% of GNP by Paszkiewicz et al [ 32 ] It is unclear which mechanism reduces melt viscosity and G′ value for nanocomposites with a low amount of nanofiller. For CNFs, this could be caused by the self‐lubrication of nanoparticles.…”

Section: Resultsmentioning

confidence: 53%

“…[ 30 ] Moreover, interactions between nanofillers and parameters such as diameter, length, aspect ratio, and measurement temperature also affect the rheological properties of materials. [ 31 ] Generally, with the increasing content of nanofillers, one can observe an increase in melt viscosity and storage modulus ( G′ ) of nanocomposites. Nevertheless, the results shown in Figure demonstrate that nanocomposites have lower melt viscosity values and G′ at low frequency and similar values of these properties at high frequency when compared to PEE.…”

Section: Resultsmentioning

confidence: 99%

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Furan‐Based Bionanocomposites Reinforced with a Hybrid System of Carbon Nanofillers

et al. 2023

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For several decades, polymer nanocomposites (PNCs) have received the interest of the scientific community and industry. [1,2] PNCs can be described as a system consisting of two or more phases, with one or more dispersed phases in the nanoscale within the polymer matrix phase. [3,4] It is possible to improve the thermal, mechanical, barrier, electrical, and biological properties of a polymer matrix with a small addition of a nanofiller. Several factors affect the improvement in properties: the particle size, the degree of surface development, and the distribution of nanoparticles in the polymer matrix. [5] Carbon-based Nanomaterials can be classified according to the number of dimensions they display on the nanoscale: 1D fibers such as carbon nanofibers (CNFs); 2D platelets, for example, graphene and layered silicate; and 3D particles like spherical silica, semiconductor nanoclusters, and quantum dots. [6][7][8] CNFs have excellent mechanical, thermal, and electrical properties. The tensile strength and Young's modulus of CNF are in the range of 1.5-7 and 228-724 GPa, respectively. [9] The range of these values varies depending on processing methods and fiber diameter. The graphene nanoplatelets (GNPs) are 2D carbon-based nanoparticles with a plate-like shape. Adding GNPs to a polymer matrix generally increases the value of barrier properties, thermal conductivity, and mechanical properties. The value of Young's modulus was reported to be 1.1 TPa, and the tensile strength was 125 GPa for GNPs. [10] Moreover, hybrid polymer composites are growing in popularity in the scientific community. These composites are obtained by adding at least two nanofillers to the polymeric matrix, which can achieve a synergistic effect that improves thermal, mechanical, barrier, and electrical properties.However, it is not only the type of nanoparticles that determines the properties of PNCs, but also the polymer matrix. Thermoplastic elastomers (TPEs) are a class of materials that combine the mechanical properties of elastomers and the processing properties of thermoplastics. [11] This is because of their morphology, which can be divided into rigid and flexible segments. Compared to traditional elastomers, the rigid TPE segment forms physical crosslinking instead of chemical

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Section: Sample A)supporting

confidence: 72%

Section: Resultsmentioning

confidence: 53%

Section: Resultsmentioning

confidence: 99%

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Furan‐Based Bionanocomposites Reinforced with a Hybrid System of Carbon Nanofillers

et al. 2023

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“…25 A few authors have reported in the past that the oriented short fibers in the polymer melt lead to reduction of the viscosity during processing. Nishitani and Kitano 26 observed decrease in viscosity of polyamide by addition of 1% of carbon nanofiber at all shear rates. Kopplmayr et al 27 report that pre-orientation of fibers lowers the dynamic viscosity in glass fiber filled PP.…”

Section: Resultsmentioning

confidence: 91%

Melt processing behaviour and structure development in recycled PP blends with recycled PET

Neve¹,

Thorat²,

Radhakrishnan³

2022

Progress in Rubber, Plastics and Recycling Technology

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Commercially available recycled polypropylene (R-PP) and recycled bottle grade polyethylene terephthalate (R-PET) were melt compounded in different proportions of R-PET in twin screw extruder at temperatures used typically for PP processing. The melt flow behaviour was investigated for these blends using capillary rheometer at different temperatures viz. 230, 250, 260°C. The crystallization and structure development was studied using DSC and XRD. The melt viscosity (η) of these blends followed the usual non-Newtonian behaviour with decrease of η with high shear rate (γ′) and saturation at low shear rate. Most noteworthy finding was that the low shear viscosity at melt temperatures of 230 and 250 showed a peak with increase of R-PET content while at 260°C there was uniform decrease in the viscosity with addition of R-PET. The high shear viscosity also showed similar trend but with less pronounced changes. This was attributed to the cross over of domain shape from spherical to ellipsoidal and finally fibrous shape according to Utracki model. At the melt compounding/processing temperature of 230°C, the R-PET phase was in semi solid state and hence it formed fibrous morphology in the PP melt which was confirmed by SEM analysis. The most interesting finding was that crystallization of both the component polymers was affected due to the presence of the other. R-PP showed nucleation effect in presence of R-PET with the shift in Tc from 118°C to higher temperature side (123°C). Even R-PET exhibited shift in the Tc from 178°C to 201°C in presence of R-PP. These results are discussed in terms of nucleation and slow heat dissipation for PET domain in PP melt together with shear induced crystallization. These structural modifications in the R-PP/R-PET blends led to improvement in properties at certain compositions processed under certain conditions.

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“…are not known. It is thus very critical to understand the rheological behavior of these biomass composites in the molten state such as processability, internal microstructure, changes and structure-property relationships (8). For this reason, there is a need to investigate its rheological properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of Addition of PTFE on the Rheological and Mechanical Properties of CF Reinforced Plant-Derived Semi-Aromatic Polyamide (PA10T) Biomass Composites

Ono

Nishitani

2018

ECS Trans.

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To develop new engineering materials such as structural materials and tribomaterials based on plant-derived materials with sufficient balance among mechanical, processability, tribological properties, eco-friendliness, etc., this study aimed to investigate the effect of adding polytetrafluoroethylene (PTFE) on the rheological and mechanical properties of carbon fiber (CF) reinforced plant-derived semi-aromatic polyamide (PA10T) biomass composites. It was found that the effect of PTFE addition has strong influence on the rheological and mechanical properties of CF/PA10T biomass composites. In particular, the mechanical properties of CF/PA10T biomass composites remarkably improved when filled with PTFE. Moreover, CF/PA10T/PTFE biomass composites filled with both PTFE and CF, showed improvement in both mechanical properties and tribological characteristics as well.

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Rheological Properties of Carbon Nanofiber-Filled Polyamide Composites and Blend of these Composites and TPE

Cited by 6 publications

References 53 publications

Furan‐Based Bionanocomposites Reinforced with a Hybrid System of Carbon Nanofillers

Furan‐Based Bionanocomposites Reinforced with a Hybrid System of Carbon Nanofillers

Melt processing behaviour and structure development in recycled PP blends with recycled PET

Effect of Addition of PTFE on the Rheological and Mechanical Properties of CF Reinforced Plant-Derived Semi-Aromatic Polyamide (PA10T) Biomass Composites

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