Photoluminescence and optical properties of He ion bombarded ultra-high molecular weight polyethylene

Abdul-Kader, A.M.

doi:10.1016/j.apsusc.2008.12.057

Cited by 36 publications

(15 citation statements)

References 27 publications

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“…To clarify the π-π stacking of aromatic ring on SPEEK polymer backbone, the relationship between optical absorption coeffi cient (α) and photon energy to represent energy bandgap under heat treatment was evaluated (Supporting Information 3). [ 22 ] The direct optical bandgap, α 2 , was plotted as a function of photon energy (hν) ( Figure S5, Supporting Information). The optical energy bandgap, E g , calculated from the intersection of the extrapolated line at zero photon energy (α 2 ).…”

Section: Resultsmentioning

confidence: 99%

“…This implies that the electrons on valence band were excited to the conduction band. [ 22 ] Moreover, the π-π stacking of aromatic ring can be explained by the clusters of aromatic carbons (N), which can be determined by the modifi ed Tauc's equation (Supporting Information 3). [ 23 ] Figure 2 c shows the number of aromatic carbon in cluster determined by E g at each temperature.…”

Section: Resultsmentioning

confidence: 99%

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Shifting from Hydrogen Bond Network to π–π Stacking: A Key Mechanism for Reversible Thermochromic Sulfonated Poly(Ether Ether Ketone)

Jarumaneeroj

Tashiro²,

Chirachanchai

2014

Macromol. Rapid Commun.

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Sulfonated poly(ether ether ketone) (SPEEK) thin film performs reversible thermochromic property by developing the color to be yellowish at the temperature above 190 °C. The detailed analyses based on temperature-dependent techniques suggest the thermal treatment inducing the shifting of the hydrogen bond network between the sulfonated group and the hydrated water molecules to the π-π stacking among aromatic rings in SPEEK chains. Although it is general that the polymer chain packing is unfavorable at high temperature, the present work shows a good example that when the polymer chains can form specific molecular interaction, such as π-π stacking, even in harsh thermal treatment, a rearrangement will effectively occur, which leads to an external stimuli-responsive property.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Shifting from Hydrogen Bond Network to π–π Stacking: A Key Mechanism for Reversible Thermochromic Sulfonated Poly(Ether Ether Ketone)

Jarumaneeroj

Tashiro²,

Chirachanchai

2014

Macromol. Rapid Commun.

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“…higher the absorption edge broadening, lower the band gap energy whether it is direct or indirect. Dependence of energy band gaps on irradiation can be explained on the basis of number (N) of carbon atoms in a C ¼C cluster which are obtained while using the modified Tauc's equation (Abdul-Kader, 2009) and presented in Table 1. It is quite obvious that energy band gaps are in direct relation with the number of carbon atoms in the C ¼C cluster (i.e.…”

Section: Study Of Optical Behaviormentioning

confidence: 99%

“…The value of n is 2, 3, 1/2, 3/2, for indirect allowed and indirect forbidden, direct allowed and direct forbidden transitions, respectively. Number of carbon atoms (N) in a cluster of each sample is correlated to optical energy band gaps (E g ) and was determined while using the modified Tauc's equation (Abdul-Kader, 2009;Raghuvanshi et al, 2012).…”

Section: Data Analysis and Processingmentioning

confidence: 99%

Spectroscopic and sub optical band gap properties of e-beam irradiated ultra-high molecular weight polyethylene

Khan

Gahfoor

Mehmood

et al. 2015

Radiation Physics and Chemistry

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“…The variations like sample placement, laboratory environment, built-in optics alignment, source power etc may change results including transmittance, therefore, three to four readings of transmitted date were recorded and averaged before finding the optical properties. Comprehensive details about the Urbach formula, method, and spectro-polarimeter can be found in literature [24,25,26]. Figure 3 (a) shows FTIR spectra of Mg x Ni x Zn 1-x Fe 2 O 3 from 400cm -1 to 4000cm -1 along with the zoomed in segments from 400cm -1 to 2000cm -1 and 400cm -1 to 650cm -1 , respectively.…”

Section: Uv-visible Spectroscopymentioning

confidence: 99%

Spectroscopic Study of Ultra High Molecular Weight Polyethylene (UHMWPE) and Mg-Ni-doped ZnFe<SUB>2</SUB>O<SUB>3</SUB> Nano Composites

Azam¹,

Mehmood²

2020

PMC

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The present study aims at investigating the effect of incorporating nano scale Mg x Ni x Zn 1-x Fe 2 O 3 (where x=0.15) as nano fillers on the physical and chemical stability of ultra high molecular weight polyethylene (UHMWPE). The effect of adding 1% and 2% (by weight) nano fillers on the physicochemical properties of UHMWPE/Mg x Ni x Zn 1-x Fe 2 O 3 nano composites have also been investigated by using FTIR, Raman, and UV-VIS spectroscopy. FTIR data of UHMWPE/Mg x Ni x Zn 1-x Fe 2 O 3 nano composites reveal that the addition of Mg x Ni x Zn 1-x Fe 2 O 3 up to 1% induces significant chemical and physical structural alterations in UHMWPE matrix. However, this behavior is found to reduce on increasing the concentration of nano fillers from 1% to 2%. Raman spectroscopic data shows that crystalline contents of UHMWPE remain unaffected with the addition of nano fillers, however; a significant increase in amorphous contents and decrease in all-trans interphase region is observed. This behavior is attributed to the chain scission reactions due to addition of Mg x Ni x Zn 1-x Fe 2 O 3 followed by compression moulding process at high pressure and elevated temperature. Absorption spectroscopy analysis revealed that the incorporation of Mg x Ni x Zn 1-x Fe 2 O 3 results in decrease of energy band gaps from 2.14 eV to 2.08 eV (for direct transition) and from 1.54 eV to 1.38eV (for indirect transition) due to band gap energy which is induced because of Mg x Ni x Zn 1-x Fe 2 O 3 incorporation as nano fillers within the PE matrix.

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Photoluminescence and optical properties of He ion bombarded ultra-high molecular weight polyethylene

Cited by 36 publications

References 27 publications

Shifting from Hydrogen Bond Network to π–π Stacking: A Key Mechanism for Reversible Thermochromic Sulfonated Poly(Ether Ether Ketone)

Shifting from Hydrogen Bond Network to π–π Stacking: A Key Mechanism for Reversible Thermochromic Sulfonated Poly(Ether Ether Ketone)

Spectroscopic and sub optical band gap properties of e-beam irradiated ultra-high molecular weight polyethylene

Spectroscopic Study of Ultra High Molecular Weight Polyethylene (UHMWPE) and Mg-Ni-doped ZnFe<SUB>2</SUB>O<SUB>3</SUB> Nano Composites

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