Thermal and optical properties of poly(methyl methacrylate)/calcium carbonate nanocomposite

Elimat, Z. M.; Zihlif, A. M.; Avella, Maurizio

doi:10.1080/17458080802603715

Cited by 40 publications

(9 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar to the studies in the literature, the indirect transition energies ( E i ) were obtained lower than the direct transition energies ( E d ) . In literature, the studies on various PMMA composites have reported that the optical band gap energy is in the range of 3.0–5.5 eV for pure PMMA , and the band gap energy level of insulating materials is around 6 eV. As pure PMMA is an insulating polymer, the value of 6 eV obtained is an acceptable result.…”

Section: Resultssupporting

confidence: 80%

See 1 more Smart Citation

Effects of GNP addition on optical properties and band gap energies of PMMA films

et al. 2018

View full text Add to dashboard Cite

In this study, the effects of graphene nanoplatelet (GNP) doping on the optical parameters (absorption coefficient, α and extinction coefficient, k) and the optical transition energies (optical band gap and Urbach energies) of poly(methyl methacrylate)/graphene nanoplatelet (PMMA/GNP) composite films were studied. PMMA/GNP composite films with various GNP mass fractions were prepared by spin coating technique. The absorbance (A) changes of the prepared composites were measured by using UV–Vis technique. The α and k values of the composites were obtained from UV–Vis data. The observed rapid increase in A values in UV‐region were associated with the optical transitions of GNP electrons from valence to conduction band. The direct (Ed) and indirect (Ei) optical band gap energies of the composites were determined by using Tauc method. Both of the band gap energies were decreased when the GNP content in the PMMA matrix is increased. The decrease in the band gap energies was interpreted as evidence of increased conductivity of the composites. Additionally, energies of the band tails (Urbach energy) were calculated. It was seen that the Urbach energy levels were increased with GNP content. POLYM. COMPOS., 40:1862–1869, 2019. © 2018 Society of Plastics Engineers

show abstract

Section: Resultssupporting

confidence: 80%

“…While this increment is linear for R

\leq

6 wt% , it has an exponential character for R

\geq

10 wt% . It has previously been reported that the E U values are increased by increasing the amount of conductive additive for various PMMA composite systems . E U is also a measure of amorphousness .…”

Section: Resultsmentioning

confidence: 99%

Effects of GNP addition on optical properties and band gap energies of PMMA films

et al. 2018

View full text Add to dashboard Cite

show abstract

“…This edge is a measure of the optical BG energy [ 36 , 37 ]. The extent of absorption is based on an absorption coefficient α ( υ ), indicating the relative rate at which the incident light intensity attenuates in a unit length of the medium [ 11 , 38 , 39 ]. Determination of the ( υ ) at the equivalent frequency (υ) from the absorbance spectra A ( υ ) can be performed using Beer–Lambert law [ 6 , 36 , 37 ]:

where the incident light and transmitted light intensities are denoted by I o and I, respectively, and the sample thickness is represented by d. Figure 5 shows α ( υ ) against photon energy ( hυ ) for pure PVA and PVA films doped with CeO 2 samples.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of PVA/CeO2 Based Nanocomposites with Tuned Refractive Index and Reduced Absorption Edge: Structural and Optical Studies

et al. 2021

View full text Add to dashboard Cite

In the current study, polymer nanocomposites (NCPs) based on poly (vinyl alcohol) (PVA) with altered refractive index and absorption edge were synthesized by means of a solution cast technique. The characterization techniques of UV–Vis spectroscopy and XRD were used to inspect the structural and optical properties of the prepared films. The XRD patterns of the doped samples have shown clear amendments in the structural properties of the PVA host polymer. Various optical parameters were studied to get more insights about the influence of CeO2 on optical properties of PVA. On the insertion of CeO2 nanoparticles (NPs) into the PVA matrix, the absorption edge was found to move to reduced photon energy sides. It was concluded that the CeO2 nanoparticles can be used to tune the refractive index (n) of the host polymer, and it reached up to 1.93 for 7 wt.% of CeO2 content. A detailed study of the bandgap (BG) was conducted using two approaches. The outcomes have confirmed the impact of the nanofiller on the BG reduction of the host polymer. The results of the optical BG study highlighted that it is crucial to address the ɛ” parameter during the BG analysis, and it is considered as a useful tool to specify the type of electronic transitions. Finally, the dispersion region of n is conferred in terms of the Wemple–DiDomenico single oscillator model.

show abstract

“…Table V shows the variation of the thermal conductivity with temperature for the 20 wt % iron composite on heating to about 50°C. It can be seen that conductivity increases with temperature from a value 0.20 to 0.26 W/m °C in a small temperature rise of 5°C, which is due to thermal activation of the phonons in the composite 20. In heating, phonons, electrons, and impurities are activated and thus enhance the thermal conductivity of the polymeric composites.…”

Section: Resultsmentioning

confidence: 97%

Physical characterization and performance of iron polymer composites

Zihlif

Al-Ramadin

Sbeih

2012

J of Applied Polymer Sci

View full text Add to dashboard Cite

The physical properties of poly(ethylene oxide) (PEO) composites containing natural iron oxides with different concentrations 2, 4, 6, 8, 10, 15, and 20% by weight were studied. Powder of iron oxides of 63‐μm particle size was casted with PEO polymer. Absorption UV spectra were collected in the wavelength range 300–800 nm by using a spectrophotometer. The optical energy gap and energy tail widths of localized states of the prepared composites were determined from Urbach formula. The electrical properties were studied using AC impedance measurements performed at different temperatures and in frequency range 100 kHz to 1 MHz. Impedance, dielectric constant, dielectric loss, and AC‐conductivity showed frequency and temperature dependence. The thermal conductivity of the composites was studied as a function of iron oxides concentration and in temperature range 20–50°C. It was found that the thermal conductivity of the composites increases with filler concentration and temperature. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

show abstract

Thermal and optical properties of poly(methyl methacrylate)/calcium carbonate nanocomposite

Cited by 40 publications

References 19 publications

Effects of GNP addition on optical properties and band gap energies of PMMA films

Effects of GNP addition on optical properties and band gap energies of PMMA films

Synthesis of PVA/CeO2 Based Nanocomposites with Tuned Refractive Index and Reduced Absorption Edge: Structural and Optical Studies

Physical characterization and performance of iron polymer composites

Contact Info

Product

Resources

About