Thermal and mechanical properties of single-walled and multi-walled carbon nanotube polycarbonate polyurethane composites with a focus on self-healing

Bass, Roger W.; Julien, Tamalia; Rigolo, Alyssa; Hong, Seung-Ug; Li, Xiao; Harmon, Julie P.

doi:10.3139/146.111384

Cited by 4 publications

(4 citation statements)

References 61 publications

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“…MWCNTs with rolled graphitic layers with remarkable mechanical 17–19 , thermal 20,21 and electrical 22–24 properties can be applied as reinforcement of fiber/matrix composites to achieve improved properties. In the last decades, the use of MWCNTs as filler in thermoplastics such as PE 25–27 , PP 28–31 or polycarbonate 32–34 has been widely studied. However, to take advantages of the reinforcement characteristics of MWCNTs, hindering factors have to be eliminated, such as the strong Van der Waals interaction between the MWCNTs and their poor surface wetting properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and investigation of SiO2-MgO coated MWCNTs and their potential application

Németh

Varro

Réti

et al. 2019

Sci Rep

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In the present publication, multiwalled carbon nanotubes (MWCNT) coated with SiO2–MgO nanoparticles were successfully fabricated via sol–gel method to facilitate their incorporation into polymer matrices. Magnesium acetate tetrahydrate and tetraethyl orthosilicate were used as precursors. The coated MWCNTs were characterized by transmission electron microscopy (TEM), X–ray diffraction (XRD) and Raman spectroscopy methods. These investigation techniques verified the presence of the inorganic nanoparticles on the surface of MWCNTs. Surface coated MWCNTs were incorporated into polyamide (PA), polyethylene (PE) and polypropylene (PP) matrices via melt blending. Tensile test and differential scanning calorimetry (DSC) investigations were performed on SiO2–MgO/MWCNT polymer composites to study the reinforcement effect on the mechanical and thermal properties of the products. The obtained results indicate that depending on the type of polymer, the nanoparticles differently influenced the Young’s modulus of polymers. Generally, the results demonstrated that polymers treated with SiO2-MgO/MWCNT nanoparticles have higher modulus than neat polymers. DSC results showed that nanoparticles do not change the melting and crystallization behavior of PP significantly. According to the obtained results, coated MWCNTs are promising fillers to enhance mechanical properties of polymers.

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Section: Introductionmentioning

confidence: 99%

Synthesis and investigation of SiO2-MgO coated MWCNTs and their potential application

Németh

Varro

Réti

et al. 2019

Sci Rep

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“…Our previous research on the novel PCPU has shown that our polymer is ultrasoft with a shore A hardness of 70, has high tensile strength and shows partial self‐healing, which can be enhanced with the addition of carbon nanotubes . We are now looking at the effect of transforming the PCPU to fiber membranes to investigate whether the thermal and mechanical properties are affected.…”

Section: Introductionmentioning

confidence: 96%

“…PCPU is a thermoplastic PU (TPU), which is a class of polymers that possess excellent properties, including toughness, abrasion resistive, excellent hydrolytic stability, elastomeric, and durability, making it versatile for widespread uses . Because of its biocompatibility, non‐toxicity, robustness, and functionality, TPUs can be used in the biomedical industry as implantable devices (vascular grafts, pacemaker leads, blood bags, bladders, and artificial heart valves) and medical applications .…”

Section: Introductionmentioning

confidence: 99%

“…In addition, PCPU also has properties similar to segmented PUs, which consists of hard and soft segments. It exhibits microphase separation due to a high degree of mixing of hard and soft segments because of hydrogen bonding between the hard segment urethane groups and the soft segment carbonate groups . The ability to electrospin our novel PU to fabricate nanofibers and nanomembranes has broadened its applications in the medical and industrial fields for sensor fabrications, drug delivery systems, and scaffolds for tissue engineering where lightweight material with larger surface area is needed.…”

Section: Introductionmentioning

confidence: 99%

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Ultrasoft polycarbonate polyurethane nanofibers made by electrospinning: Fabrication and characterization

Julien

Subramanyam

Katakam

et al. 2019

Polymer Engineering & Sci

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A novel, high performance ultrasoft polycarbonate polyurethane polymer was electrospun and tested against its bulk material to investigate changes in its thermal and mechanical properties. A series of fiber membranes was processed via solution electrospinning using a 90:10 ratio of dimethyformamide‐ethylacetate. Thermal, mechanical, and structural properties were obtained using thermal gravimetric analysis (TGA), differential scanning calorimetry (DSC), wide‐angle X‐ray scattering (WAXS), and tensile testing. TGA revealed that thermal stability of the membranes increased with the concentration of polymer solution used in spinning. DSC showed no variation in glass transition temperatures while the melting point regions varied noticeably with spinning conditions. WAXS profiles in solution casts films and electrospun mats showed the presence of diffraction peaks related to ordered crystal lamellae in the hard segment region at lower concentrations; these intensified after electrospinning. As the concentration of the polymer solution increased, the molecular orientation decreased. Tensile testing showed a significant increase in tensile strength at 18 w/v% fiber membranes. The ability of the polymer membrane characteristics to be tuned by processing conditions is of great interest in applications related to biotechnology, drug delivery, and implantable polymeric systems. POLYM. ENG. SCI., 59:838–845, 2019. © 2019 Society of Plastics Engineers

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Impact of clay modifier on structure, thermal, mechanical and transport properties in polyurethane/Maghnite nanocomposites as barrier materials

Khiati

Mrah

2023

Iran Polym J

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In the present study, thermoplastic polyurethane (TPU) nanocomposites based on maghnite as an inorganic reinforcing phase were synthesized. The result of this study was to evaluate the gas barrier property of a thermoplastic polyurethane (TPU) material containing clay nanoparticles. The preparation of the thermoplastic polyurethane prepolymer with NCO terminations was carried out by the in situ solution polymerization method. The clay was previously modi ed by intercalating 12-aminododecanoic acid NH 2 (CH 2 ) 11 COOH (12-Mag) molecules. The polyethylene glycol / tolylene 2,4-diisocyanate (PEG/TPI) matrix was extensively compatibilized with the organo-modi ed clay, 12-Maghnite. The objective of this study is to evaluate the effects of the use of organoclay on the development of thermoplastic polyurethane (TPU) nanocomposites composed of 1, 3, 5 and 7 wt% organoclay. The results obtained by XRD, by Transmission and Scanning Electron Microscopy (TEM, SEM) revealed that the modi ed maghnite was well dispersed at 1 wt% in the polyurethane matrix. Thermogravimetric (TG) tests have shown that the nanocomposites samples also have better thermal stability. Using the membrane separation test device, gas permeability was examined. Signi cant improvements in barrier properties were observed. The mechanical properties of the nanocomposites were evaluated as a function of the clay ller used and the TPU matrix.

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Thermal and mechanical properties of single-walled and multi-walled carbon nanotube polycarbonate polyurethane composites with a focus on self-healing

Cited by 4 publications

References 61 publications

Synthesis and investigation of SiO2-MgO coated MWCNTs and their potential application

Synthesis and investigation of SiO2-MgO coated MWCNTs and their potential application

Ultrasoft polycarbonate polyurethane nanofibers made by electrospinning: Fabrication and characterization

Impact of clay modifier on structure, thermal, mechanical and transport properties in polyurethane/Maghnite nanocomposites as barrier materials

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