Study of the electronic and vibrational properties of poly(ethylene terephthalate) and poly(ethylene naphthalate) films

Laskarakis, A.; Logothetidis, S.

doi:10.1063/1.2709572

Cited by 43 publications

(31 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The correlation factor between the nA and nB obtained by the fitting was relatively large (94.3%). Nevertheless, the model can be considered reliable because: (i) the correlation between nA and nB did not strongly affect the mean refractive index in the visible range; (ii) the obtained refractive index is in reasonable agreement with data reported in the literature [30], notwithstanding the adopted approximation of a simplified model. The model obtained for the PET semi-infinite substrate was then used to investigate the optical properties of the pullulan coating laid on the PET surface.…”

Section: Optical Propertiessupporting

confidence: 68%

Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties

Ünalan

Boyacı

Trabattoni

et al. 2017

Preprint

View full text Add to dashboard Cite

This study presents a new bionanocomposite coating on poly(ethylene terephthalate) (PET) made of pullulan and synthetic mica. Mica nanolayers have a very high aspect ratio (α) at levels much greater than that of conventional exfoliated clay layers (e.g., montmorillonite). A very small amount of mica (0.02 wt%, which is ϕ ≈ 0.00008) in pullulan coatings dramatically improved the oxygen barrier performance of the nanocomposite films under dry conditions, whereas this performance was partly lost as the environmental relative humidity (RH) increased. This outcome was explained in terms of the perturbation of the spatial ordering of mica sheets within the main pullulan phase because of RH fluctuations, as confirmed by modelling of the experimental OTR data according to Cussler's model. The presence of the synthetic nanobuilding block (NBB) led to a decrease in both static and kinetic coefficients of friction compared with neat PET (≈12% and 23%, respectively) and PET coated with unloaded pullulan (≈ 26% reduction in both coefficients). In spite of the presence of the filler, all of the coating formulations did not significantly impair the overall optical properties of the final material, which exhibited haze values below 3% and transmittance above 85%, with the only exception represented by the formulation with the highest loading of mica (1.5 wt%, which is ϕ ≈ 0.01). These findings revealed, for the first time, the potential of the NBB mica to produce nanocomposite coatings in combination with biopolymers for the generation of new functional features, such as transparent high oxygen barrier materials.

show abstract

Section: Optical Propertiessupporting

confidence: 68%

Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties

Ünalan

Boyacı

Trabattoni

et al. 2017

Preprint

View full text Add to dashboard Cite

show abstract

“…These materials combine the key properties of their constituents such as high transparency, hardness, chemical and thermal stability (glass-like), low processing temperatures, functionalization, toughness (polymer-like), and flexibility (silicone-like) [16,17]. The investigation of the optical properties of the hybrid polymers in the infrared (IR) to the visible and to the far ultraviolet (Vis-fUV) spectral region can provide valuable information on the understanding of their bonding and electronic structure and microstructure, as well as on their optical transparency [18][19][20]. Moreover, it is more important to study the hybrid polymers' structure when these are deposited onto inorganic materials such as SiO x , which are used as barriers as well as the bonding on the hybrid-inorganic interface and its effect on their functionality.…”

Section: Introductionmentioning

confidence: 99%

Optical properties of hybrid polymers as barrier materials

Georgiou

Laskarakis

Logothetidis

et al. 2009

Applied Surface Science

Self Cite

View full text Add to dashboard Cite

“…The strong absorption bands shown in this spectral region indicate the contribution of the vibrational modes corresponding to the IR-active chemical bonds of SiO x , PET and PEN. Above 1800 cm -1 , both films are optically transparent and their FTIRSE spectra are dominated by Fabry-Perot oscillations due to the multiple reflections of light at the PET and PEN interfaces [16,17].…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the stretching vibration of the carbonyl C=O group appears in lower energy in case of PEN (1713 cm -1 ) than in PET (1720 cm -1 ) [15,16]. In order to accurately determine the energy of the Si-O stretching vibration, we have analysed the measured <ε(ω)> spectra by the use of a three-layer model (air/SiO x /substrate) and the optical response of the SiO x film in the region of the Si-O vibration band has been described by a harmonic oscillator (Lorenz model) [16,17]. The contribution of the Si-O stretching vibration can be seen in the range of 1002 and 1000 cm -1 for the case of SiO x films deposited onto PET and PEN substrates, respectively.…”

Section: Resultsmentioning

confidence: 99%

Growth mechanisms of silicon oxide nano‐layers grown onto polymeric substrates for flexible electronics applications

Georgiou

Laskarakis

Koidis

et al. 2008

Phys. Status Solidi (c)

Self Cite

View full text Add to dashboard Cite

Silicon oxide (SiOx) thin films are used as protective layers on flexible electronic devices in order to protect them from permeation of atmospheric O2 and H2O that induce corrosion effects to the active layers of these devices. In this work in‐situ and real‐time Spectroscopic Ellipsometry (SE) was used to monitor the SiOx deposition onto the polymeric substrates. The analysis of the real‐time SE measurements revealed information about the growth mechanism and showed that SiOx follows an island type growth mechanism onto Poly(Ethylene Terephthalate)‐PET substrate and a layer‐by‐layer mechanism onto Poly(Ethylene Naphthalate)‐PEN substrate. Also, SE provides information about the evolution of the optical response during the deposition of SiOx nano‐layers and of SiOx stoichiometry and how it is affected by substrate's surface. Furthermore the realization of sequential SE measurements onto different sites onto the sample surface led to the spatial distribution of the SiOx nano‐layers optical properties. Finally the investigation of SiOx bonding structure has been performed by Fourier Transform InfraRed Spectroscopic Ellipsometry (FTIRSE) and led to the determination of the different vibrational modes of SiOx nano‐layers and its relation to the SiOx growth mechanisms and the substrates (PET and PEN). (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract

Study of the electronic and vibrational properties of poly(ethylene terephthalate) and poly(ethylene naphthalate) films

Cited by 43 publications

References 32 publications

Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties

Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties

Optical properties of hybrid polymers as barrier materials

Growth mechanisms of silicon oxide nano‐layers grown onto polymeric substrates for flexible electronics applications

Contact Info

Product

Resources

About