Development and Characterization of Amorphous Thermoplastic Matrix Graphene Nanocomposites

Greco, Antonio; Timo, Alessia; Maffezzoli, Alfonso

doi:10.3390/ma5101972

Cited by 16 publications

(9 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 3 shows the X-ray diffraction patterns of the as-received thermoplastic materials of the different brands. It is evident that EK, EP and GA samples have comparable XRD patterns, and this result confirms that they are made up of amorphous PET, the same base polymer also associable with PETG, by the comparison with the ICDD reference database (#00-060-1509) [41,42]. In fact, we observed the presence of two broad diffraction haloes that peaked at around 19° and 43° 2θ, respectively, and that were exactly related to the features of the amorphous PET phase.…”

Section: Water Absorption Test At Different Temperaturesmentioning

confidence: 72%

Thermoplastic Disks Used for Commercial Orthodontic Aligners: Complete Physicochemical and Mechanical Characterization

et al. 2020

View full text Add to dashboard Cite

Invisible orthodontic aligners (IOAs) have been introduced in the orthodontic field as an innovative alternative for fixed brackets, in relation to their ability to be easily inserted/removed from the oral cavity without affecting the chewing ability and the aesthetic of the patients. The paper provides a complete physicochemical and mechanical characterization of thermoplastic materials in the form of disks used for commercial IOAs. A wide palette of specific techniques is considered, from tensile tests and dynamic-mechanical analysis, to X-Ray diffraction (XRD), differential scanning calorimetry (DSC), Fourier transformation infrared spectroscopy (FTIR-ATR) analyses and water absorption tests. The disks are investigated before and after immersion into staining beverages (red wine, coffee, nicotine and artificial saliva), in terms of colour variations, transparency, and microscopic surface modifications by means of colorimetry, UV-VIS absorbance and scanning electron microscopy (SEM). Among all the samples, polyurethane (PU) exhibited the highest crystallinity and the highest values of mechanical and thermal resistance, while the poly(ethylene terephthalate)-glycol (PETG) samples presented better transparency and less ability to absorb water. Moreover, red wine and coffee give noticeable colour variations after 14 days of immersion, together with a slight reduction of transparency.

show abstract

Section: Water Absorption Test At Different Temperaturesmentioning

confidence: 72%

Thermoplastic Disks Used for Commercial Orthodontic Aligners: Complete Physicochemical and Mechanical Characterization

et al. 2020

View full text Add to dashboard Cite

show abstract

“…From these results, it clear that the incorporation of GOn and Fe 3 O 4 nanoparticles in the PVDF-SBR blend matrix induced better thermal stability and thus the starting decomposition temperature is shifted to higher temperatures. During thermal degradation, GOn and Fe 3 O 4 nano llers, due to their inorganic nature, with the homogeneous distribution and distribution of nano llers prevent the evolution of volatile decomposition products acting as a barrier inhibiting the propagation of heat from the environment in the polymer matrix [36,37]. On the other hand, there is a close relationship between the crystallin phase of PVDF and the obtained results regarding the increased thermal stability.…”

Section: Thermal Propertiesmentioning

confidence: 62%

Multifunctional Poly(Vinylidene Fluoride) and Styrene Butadiene Rubber Blend Magneto-responsive Nanocomposites Based on Hybrid Graphene Oxide and Fe3O4: Synthesis, Preparation and Characterization

Essabir

Raji

Rodrigue

et al. 2021

Preprint

View full text Add to dashboard Cite

Functional nanocomposites based on a blend of styrene butadiene rubber (SBR) and polyvinylidene difluoride (PVDF) as the matrix reinforced by a hybrid nanofiller system of graphene oxide nanosheets (GOn) and ferromagnetic nanoparticles (Fe3O4) at different weight ratios (3.75:1.25; 2.5:2.5 and 1.25:3.75) were successfully prepared and characterized to determine the effect of nanofillers hybridization in improving the structural,mechanical, dielectric/electrical, magnetic and thermal properties of a polymer blend (PVDF-SBR) for electromagnetic interference (EMI) shielding applications. Due to the synergy between both nanofillers, it was found that the Young’s modulus of the nanocomposite containing 5 wt.% of the hybrid nanofiller was significantly improved (87%), while the strain at yield remained constant due to the low particle content and the rubbery effect of the SBR copolymer. In addition, the degradation temperature of the matrix was shifted from 464°C to 472 °C with the addition of 2.5:2.5 of GOn:Fe3O4. Finally, the hybrid reinforcement also had a positive effect on the electrical and magnetic properties of the nanocomposites with an improvement that exceeds 30%. By careful selection of synthetic techniques and understanding/exploiting the unique physics of the polymeric nanocomposites in such materials, novel functional polymer-inorganic nanocomposites can be designed and fabricated for new interesting in magneto applications such as superparamagnetism, electromagnetic wave absorption, and electromagnetic interference shielding.

show abstract

“…The elastic modulus E, the tensile strength  r and the elongation at break  r of neat and nanofilled aPET fibers are reported in Table I. Evidence of GNP alignment in aPET fibers can be inferred by the noticeable increase (about 200%) of the elastic modulus of the nanofilled fiber, much higher than that observed in exfoliated aPET/GNP nanocomposites with random orientation, previously obtained by the authors [34]. At the same time, an embrittlement of the aPET matrix has been found, as also observed by Al-Jabareen et al [10] on PET/GNP nanocomposites produced by compression molding.…”

Section: Measurement Of Mechanical Properties Of Nanofilled Apet Fmentioning

confidence: 66%

Orientation of Graphene Nanoplatelets in Thermosetting Matrices

Greco

Lionetto

Maffezzoli

2016

IEEE Trans. Nanotechnology

Self Cite

View full text Add to dashboard Cite

A simple procedure for the alignment of graphene nanoplatelets (GNPs) in a thermosetting matrix is presented. First, the alignment of GNPs in thermoplastic fibers of amorphous polyetylene terephthalate (aPET) is achieved by a fiber spinning process. The nanocomposite fibers, obtained with a very high filler content (10 wt%), are then transferred into a reactive epoxy resin. After dissolution of aPET, the nanofillers remained oriented in the thermosetting matrix. The characterization of the obtained nanocomposites has been carried by means of different experimental techniques which provided complementary results. The proposed method has the potential to be used in the manufacturing of hierarchical composites, by introducing nanofilled microfibers into continuous fibers reinforced composites.

show abstract

Development and Characterization of Amorphous Thermoplastic Matrix Graphene Nanocomposites

Cited by 16 publications

References 52 publications

Thermoplastic Disks Used for Commercial Orthodontic Aligners: Complete Physicochemical and Mechanical Characterization

Thermoplastic Disks Used for Commercial Orthodontic Aligners: Complete Physicochemical and Mechanical Characterization

Multifunctional Poly(Vinylidene Fluoride) and Styrene Butadiene Rubber Blend Magneto-responsive Nanocomposites Based on Hybrid Graphene Oxide and Fe3O4: Synthesis, Preparation and Characterization

Orientation of Graphene Nanoplatelets in Thermosetting Matrices

Contact Info

Product

Resources

About