Mechanical properties, crystallinity, and self-nucleation of carbon nanotube-polyurethane nanocomposites

Yazdi, M. H.; Asl, V Haddadi; Pourmohammadi, Mohammadali; Roghani‐Mamaqani, Hossein

doi:10.1016/j.polymertesting.2019.106011

Cited by 36 publications

(18 citation statements)

References 43 publications

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“…Numerous reports have studied different types of HCPU with a low percentage of hard segments using various kinds of chain-extended polyurethane, such as 1,3 propane diol and (1,4 butane diol). [43][44][45] In this study, a two-step polymerisation approach was employed to synthesise HCPU with different types of chain extender (1,5 pentane-diol). A three-necked flask was equipped with a reflux tube to maintain a constant amount of solvent.…”

Section: Synthesis Of Hcpumentioning

confidence: 99%

Study on the effect of tailoring the hard copolymer polyurethane on the thermal, mechanical and electrical properties of hard copolymer polyurethane/multi-walled carbon nanotubes nanocomposites

Albozahid

Naji

Alobad

et al. 2022

Journal of Composite Materials

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This study focusses on the effect of the addition of multi-walled carbon nanotubes (MWCNTs) on the morphology and thermal, rheological and electrical properties of hard copolymer polyurethane (HCPU) using 1,5 pentane-diols as a chain extender, containing 85% of hard segment blocks. Step-growth polymerisation was used to synthesise a HCPU polymer matrix, followed by melt compounding to prepare the nanocomposites. SEM investigation of the neat HCPU structure and its nanocomposites indicated the uniform dispersion of MWCNTs within the polymer matrix; further TEM morphology investigation showed some agglomeration regions, attributed to the high MWCNT content (2 wt%). An XRD test confirmed a homogeneous distribution of MWCNTs by observing the remaining location of the highest peaks of MWCNTs and amorphous peaks of the HCPU matrix. Analysis of the melt rheology test results showed an improvement in complex viscosity combined with an increase in the G’ and G” of nanocomposites from those of pure HCPU due to the presence of MWCNTs. Finally, electrical conductivity of nanocomposites demonstrated a significant improvement in its value at high loading of MWCNTs from that of pure HCPU matrix.

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Section: Synthesis Of Hcpumentioning

confidence: 99%

Study on the effect of tailoring the hard copolymer polyurethane on the thermal, mechanical and electrical properties of hard copolymer polyurethane/multi-walled carbon nanotubes nanocomposites

Albozahid

Naji

Alobad

et al. 2022

Journal of Composite Materials

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“…The physical and mechanical properties of semi-crystalline polymers and polymer composites depend on morphology and crystallinity (Yazdi et al, 2019). As the crystallinity of the material decreases, there may be a reduction in its mechanical properties like strength and hardness.…”

Section: Influence Of Water Absorptionmentioning

confidence: 99%

Influence of water absorption on mechanical properties and glass transition temperatures of polyamide6/hexagonal boron nitride composites

Randhawa

Patel

2021

IJSI

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PurposeThe absorption of moisture/water can affect the mechanical and thermal properties of polymers and polymer composites as many polymers, mainly polyamide thermoplastics, are sensitive to environmental humidity and can absorb a large amount of moisture. This paper investigates the effect of water molecules' absorption on mechanical and thermal properties of polyamide6/hexagonal boron nitride (PA6/h-BN) composites.Design/methodology/approachThe PA6/h-BN composites were exposed to an open environment and water for 15 days to analyse the effect of humidity/water molecules' absorption on mechanical and thermal properties. The tensile strength, hardness and impact strength of materials were measured and compared. The scanning electron microscopy (SEM), x-ray diffraction (XRD) and differential scanning calorimetry (DSC) analyses were utilized to see the influence of water absorption on microstructure, crystallinity and glass transition temperatures.FindingsAfter exposing materials to an open environment and water, the tensile strength and hardness were found to decline, while improvement in impact strength was noticed. SEM characterization revealed the formation of voids/pockets in water-immersed materials. DSC analysis revealed the loss in glass transition temperatures, and XRD analysis revealed the loss in crystallinity of water-immersed materials.Originality/valueEnvironmental conditions vary according to the geographical areas, and it varies in many countries throughout the year. Polyamides are sensitive to the environmental humidity and can absorb a large amount of moisture from the environment. It becomes necessary to test these materials in their original working conditions, and sometimes it is mandatory to see the effects of extreme environmental conditions on a component. In this article, efforts have been made to investigate the influence of extreme humidity/water conditions on thermo-mechanical properties of PA6/h-BN composites.

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“…Thermal stability of polyurethanes could be increased through its chemical modification by incorporation of thermally stable heterocyclic groups into the backbone, [7,8] increasing the hard segment length, [9] and addition of fillers into the matrix [10–14] . Silica nanoparticles, [15–18] graphene oxide (GO), [19,20] and carbon nanotube (CNT) [21–25] are among the most common fillers used in the preparation of polyurethane composites. Graphene as a hexagonal lattice of sp 2 ‐hybridized carbon atoms in a two‐dimensional lattice has attracted a large interest owing to its outstanding properties [26] .…”

Section: Introductionmentioning

confidence: 99%

Hyperbranched Poly(amidoamine)‐Grafted Graphene Oxide as a Multifunctional Curing Agent for Epoxy‐Terminated Polyurethane Composites

et al. 2021

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Graphene oxide (GO) modified with hyperbranched poly(amidoamine) (PAMAM) structure (GOD) was used as a multifunctional curing agent in the preparation of thermally stable composites from epoxy‐terminated polyurethanes. The multifunctional GOD sample was prepared through a divergent approach by using (3‐Aminopropyl)triethoxysilane (APTES)‐functionalized GO as the core for grafting PAMAM dendrimer by sequential addition of methyl acrylate and ethylenediamine (EDA). Epoxy‐terminated polyurethanes with two different chain extenders of 1,4‐butanediol (BD) and pyromellitic dianhydride (PMDA) were prepared from the reaction of poly(ethylene glycol), hexamethylene diisocyanate, and chain extenders, and subsequent end group transformation of the isocyanate to epoxy functionalities. Fourier transform infrared spectroscopy and thermogravimetric analysis (TGA) proved successful preparation of GOD. TGA indicated improvement in char content and thermal stabilities of the composites with increasing GOD content and using the PMDA chain extender in comparison with the BD. Weight percentages of APTES, methyl acrylate, and EDA in the modified graphene samples were 15.8, 2.2, and 2.2 wt %, respectively, in each of the successive modification process of GO. Structural study of the graphitic and hybrid samples was accomplished with X‐ray diffraction and electron microscopies. A broad peak at about 21° in the patterns of hybrid composites originates from the amorphous structure of polyurethane.

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Mechanical properties, crystallinity, and self-nucleation of carbon nanotube-polyurethane nanocomposites

Cited by 36 publications

References 43 publications

Study on the effect of tailoring the hard copolymer polyurethane on the thermal, mechanical and electrical properties of hard copolymer polyurethane/multi-walled carbon nanotubes nanocomposites

Study on the effect of tailoring the hard copolymer polyurethane on the thermal, mechanical and electrical properties of hard copolymer polyurethane/multi-walled carbon nanotubes nanocomposites

Influence of water absorption on mechanical properties and glass transition temperatures of polyamide6/hexagonal boron nitride composites

Hyperbranched Poly(amidoamine)‐Grafted Graphene Oxide as a Multifunctional Curing Agent for Epoxy‐Terminated Polyurethane Composites

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