Polyurethane/Nitrogen-Doped Graphene Quantum Dot (N-GQD) nanocomposites: synthesis, characterization, thermal, mechanical and shape memory properties

Nejad, Sanaz Sarabiyan; Rezaei, Mehran; Bagheri, Massoumeh

doi:10.1080/25740881.2019.1647243

Cited by 18 publications

(14 citation statements)

References 57 publications

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“…Additionally, the observed peak at 1350/cm in N‐GQD's spectrum, attributed to C‐N groups, cannot be observed in that of GQD. The characteristic peaks in nanocomposites' spectra are similar to our previous work which verifies the successful synthesis of samples via in situ polymerization method, as well as indicates that the incorporation of GQDs has not changed the chemical structure of PU 18 …”

Section: Resultssupporting

confidence: 85%

“…Tin (II) bis (2‐ethylhexanoate) (Sn (Oct) 2 , 96%) and citric acid were obtained from Alfa Acer (USA) and Sigma‐Aldrich, respectively. PCL ( M n = 2000 g/mol) and PU with a molar ratio of 2(PCL)/1(HDI)/1(BDO) were synthesized by the procedure described in our previous work 18 …”

Section: Methodsmentioning

confidence: 99%

“…Various PU/GQDs nanocomposites containing 1.5, 1, and 0.5 wt.% of GQD nanoparticles were synthesized via in situ polymerization approach with a molar ratio of 2(HDI)/1(BDO)/1(PCL) using the procedure described in the previous study 18 . The synthesis steps were summarized for the sample containing 0.5 wt.% of GQDs in the following.…”

Section: Methodsmentioning

confidence: 99%

“…Different works have previously been conducted about SMPU nanocomposites and tried to mainly focus on the mechanical properties and shape memory behaviors of the various SMPU nanocomposites. As it could be understood, most of the authors have reported that these properties have been decreased by the incorporation of different contents of various nanofillers 18,19 . However, our research group have recently reported that the incorporation of graphene nanosheets and PCL‐functionalized graphene nanosheets improved the SF and SR ratios; and moreover, three effective factors including HBI (C=O) , crystallinity, and filler content, control the mechanical properties of the nanocomposites.…”

Section: Introductionmentioning

confidence: 91%

“…Then, various PU/GQD nanocomposites with different GQD nanoparticles contents were prepared by in situ polymerization approach. The main objectives of this study are the investigation of the effects of GQD nanoparticles incorporation on mechanical, optical, thermal, and shape memory properties of nanocomposites and comparing them with the PU/N‐GQD nanocomposites prepared via in‐situ polymerization approach reported in our previous work 18 …”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Effects of graphene quantum dot (GQD) on photoluminescence, mechanical, thermal and shape memory properties of thermoplastic polyurethane nanocomposites

Nejad

Babaie

Bagheri

et al. 2020

Polymers for Advanced Techs

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A group of shape memory polyurethane‐based nanocomposites containing graphene quantum dot nanoparticles (GQDs) were prepared via in‐situ polymerization method. GQD nanoparticles were synthesized by a facile and rapid microwave‐assisted method and characterized by Fourier‐transform infrared spectroscopy (FTIR), X‐ray diffraction pattern, field emission scanning microscopy, transmission electron microscopy, and fluorescence analysis. Chemical structure and hydrogen bonding index (HBI[C=O]) of the nanocomposites were analyzed via FTIR spectra. The results show that the incorporation of GQDs in PU matrix reduces HBI(C=O) of nanocomposites. Crystalline structure and thermal properties of the nanocomposites were investigated by differential scanning calorimetry. As results indicate, nucleation effect of GQDs raises crystallinity content of the samples. Mechanical examinations indicate that incorporation of GQDs improves Young's modulus of the nanocomposites, while their elongation at break values are reduced. In addition, shape memory analyses reveal that the presence of GQDs in PU matrix increases the shape fixity ratios in nanocomposites.

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Section: Resultssupporting

confidence: 85%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effects of graphene quantum dot (GQD) on photoluminescence, mechanical, thermal and shape memory properties of thermoplastic polyurethane nanocomposites

Nejad

Babaie

Bagheri

et al. 2020

Polymers for Advanced Techs

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Synthesis of dual‐stimuli‐responsive polyurethane shape memory nanocomposites incorporating isocyanate‐functionalized Fe₃O₄ nanoparticles

Babaie

Rezaei

Razzaghi

et al. 2022

J of Applied Polymer Sci

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Thermally and magnetically stimulated shape memory polyurethane (PU) nanocomposites were synthesized for intravascular stent applications.For this end, Fe 3 O 4 magnetic nanoparticles (MNPs) were modified with octadecyl isocyanate (OD) to increase their affinity with the PU matrix by formation of the covalent urea linkages. The results showed that the OD-grafted MNPs were replaced instead of carbonyl groups of polycaprolactone (PCL) soft segments in hydrogen bond formation with the urethane linkages. This led to higher phase separation degrees among the soft and hard phases, thereby PCL chains could reveal higher crystallization potential. Mechanical studies showed that the nanocomposites had high mechanical strength, Young's modulus, and elongation at break, which improve their practical applications. The nanocomposites showed thermo-responsive shape memory behavior with a high shape recovery and shape fixity ratios due to the presence of the crystallizable PCL segments. The nanocomposite containing 10 wt% of the OD-grafted MNPs could recover its original shape (during 90s) in a relatively weak alternating magnetic field (350 kHz and 12.9 kA/m). These results indicated that the prepared nanocomposites could be used to normalize the narrowed blood vessels through the remotely and magnetically-controllable restricted shape recovery process.

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Shape Memory Polyurethane as a Drilling Fluid Lost Circulation Material

Lashkari

Tabatabaei‐Nezhad

Husein

2021

Macro Materials & Eng

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Drilling fluid loss is a major problem with serious economic and environmental consequences. The use of traditional lost circulation materials (LCMs) to seal wide fractures increases the risk of bit nozzle plugging. In this work, smart LCMs based on shape memory polyurethane (SMPU) are proposed for the first time. SMPU can be programmed to recover at temperatures suited to a given well. As such, SMPU smoothly passes through the bit nozzles, while effectively seal wide fractures once activated. The SMPU is prepared by two step pre-polymerization and characterized by Fourier transform infrared spectra, X-ray diffraction, and differential scanning calorimeter. The SMPU is programmed by changing and fixing the original shape to a temporary shape through a thermo-mechanical process. The shape memory behavior of SMPU is analyzed by tensile apparatus. Compatibility of SMPU with WBMs is determined from mud rheology and filtration tests. Fracture sealing efficiency and shape recovery of SMPU are evaluated by a modified particle permeability apparatus fitted with a model fracture. The results confirm high sealing and shape recovery attributes of SMPU. The plug formed at 114 kg m -3 SMPU and 80 °C experiences a sealing pressure of 100 bar with 71.5 cm 3 cumulative fluid loss.

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Polyurethane/Nitrogen-Doped Graphene Quantum Dot (N-GQD) nanocomposites: synthesis, characterization, thermal, mechanical and shape memory properties

Cited by 18 publications

References 57 publications

Effects of graphene quantum dot (GQD) on photoluminescence, mechanical, thermal and shape memory properties of thermoplastic polyurethane nanocomposites

Effects of graphene quantum dot (GQD) on photoluminescence, mechanical, thermal and shape memory properties of thermoplastic polyurethane nanocomposites

Synthesis of dual‐stimuli‐responsive polyurethane shape memory nanocomposites incorporating isocyanate‐functionalized Fe₃O₄ nanoparticles

Shape Memory Polyurethane as a Drilling Fluid Lost Circulation Material

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Polyurethane/Nitrogen-Doped Graphene Quantum Dot (N-GQD) nanocomposites: synthesis, characterization, thermal, mechanical and shape memory properties

Cited by 18 publications

References 57 publications

Effects of graphene quantum dot (GQD) on photoluminescence, mechanical, thermal and shape memory properties of thermoplastic polyurethane nanocomposites

Effects of graphene quantum dot (GQD) on photoluminescence, mechanical, thermal and shape memory properties of thermoplastic polyurethane nanocomposites

Synthesis of dual‐stimuli‐responsive polyurethane shape memory nanocomposites incorporating isocyanate‐functionalized Fe3O4 nanoparticles

Shape Memory Polyurethane as a Drilling Fluid Lost Circulation Material

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Product

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About

Synthesis of dual‐stimuli‐responsive polyurethane shape memory nanocomposites incorporating isocyanate‐functionalized Fe₃O₄ nanoparticles