Free Volume and Density Gradients of Amorphous Polymer Surfaces As Determined by Use of a Pulsed Low-Energy Positron Lifetime Beam and PVT Data

2004 ◽  
Vol 37 (11) ◽  
pp. 4201-4210 ◽  
Author(s):  
John Algers ◽  
Ryoichi Suzuki ◽  
Toshiyuki Ohdaira ◽  
Frans H. J. Maurer
Keyword(s):  
Free Volume ◽  
Positron Lifetime ◽  
Amorphous Polymer ◽  
Low Energy ◽  
Polymer Surfaces ◽  
Density Gradients ◽  
Pvt Data

Characterization of free volume and density gradients of polystyrene surfaces by low-energy positron lifetime measurements

Polymer ◽  
2004 ◽  
Vol 45 (13) ◽  
pp. 4533-4539 ◽  
Author(s):  
John Algers ◽  
Ryoichi Suzuki ◽  
Toshiyuki Ohdaira ◽  
Frans H.J. Maurer
Keyword(s):  
Free Volume ◽  
Positron Lifetime ◽  
Low Energy ◽  
Density Gradients ◽  
Lifetime Measurements

Free Volume Determination of Azobenzene−PMMA Copolymer by a Pulsed Low-Energy Positron Lifetime Beam with in-Situ UV Illumination

2004 ◽  
Vol 37 (21) ◽  
pp. 8035-8042 ◽  
Author(s):  
John Algers ◽  
Peter Sperr ◽  
Werner Egger ◽  
Laszlo Liszkay ◽  
Gottfried Kögel ◽  
...  
Keyword(s):  
Free Volume ◽  
Positron Lifetime ◽  
Low Energy ◽  
Volume Determination ◽  
Uv Illumination

scholarly journals Study of interfaces in polymer-metal oxide films and free-volume hole using low-energy positron lifetime measurements

2019 ◽  
Vol 4 (3) ◽  
pp. 413-419 ◽  
Author(s):  
Aman Deep Acharya ◽  
Bhawna Sarwan ◽  
Ratnesh Sharma ◽  
S.B. Shrivastava ◽  
Manoj Kumar Rathore
Keyword(s):  
Metal Oxide ◽  
Free Volume ◽  
Positron Lifetime ◽  
Oxide Films ◽  
Low Energy ◽  
Metal Oxide Films ◽  
Lifetime Measurements ◽  
Polymer Metal ◽  
Free Volume Hole

Mechanical and microstructural properties of polystyrene based composites: positron lifetime spectroscopic and DSC studies

2011 ◽  
Vol 31 (2-3) ◽  
Author(s):  
Abdullah Mohammed Ali Mohammed Altaweel ◽  
Jaya Madhu Raj ◽  
Malalvalli Nagarajaiah Chandrashekara ◽  
Puttegowda Ramya ◽  
Parthasarathy Sampathkumaran ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Free Volume ◽  
Positron Lifetime ◽  
Tensile Modulus ◽  
Silica Content ◽  
Scanning Calorimetry ◽  
Dsc Studies ◽  
Microstructural Property ◽  
Calcium Aluminosilicate

Abstract Polystyrene (PS) based composites respectively with cenosphere (CS) and calcium aluminosilicate (CAS) as fillers were studied using the positron lifetime technique to reveal the correlation between free volume, a microstructural property, and mechanical properties of the composites (tensile strength and tensile modulus). The thermal stability of the composites was determined using differential scanning calorimetry. The results showed that addition of CAS filler lead to a significant improvement in the mechanical properties of the composite, whereas addition of CS resulted in improvement in tensile modulus only. Both PS/CAS and PS/CS composites showed enhancement in thermal stability compared with that of the pure PS matrix. The positron results showed that the average free volume size for the PS/CAS composite (at 40 phr CAS) was reduced significantly compared with that of the pure PS. These results are understood in terms of the influence of silica content, filler-matrix interaction, and particle size.

Preliminary Positron Lifetime Results on Free Volumes in Cyclodextrins

2010 ◽  
Vol 666 ◽  
pp. 99-102 ◽  
Author(s):  
Maria Fatima Ferreira Marques ◽  
A.M.G. Moreira Da Silva ◽  
P.M. Gordo ◽  
Z. Kajcsos
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Positron Lifetime ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Positron Source ◽  
Lifetime Component ◽  
Positron Annihilation Lifetime ◽  
Long Lifetime

Positron annihilation lifetime spectroscopy was used to study the free-volume parameters in various pure -, - and -cyclodextrins samples and, in the case of β-cyclodextrin, with inclusion of S-carvone and thymoquinone. The results clearly indicate the presence of long lifetime components related to Ps-formation. The data show that the addition of S-carvone to β-cyclodextrin results in a decrease of o-Ps lifetime that we ascribe to a reduction of free volume holes from 81.8 to 63.7 Å3. The long lifetime component disappears when thymoquinone is added to -cyclodextrin, indicating this substance acts as an o-Ps quencher. For all samples studied, a decrease in the long lifetime component values was observed with increasing source in situ time, a result that might be attributed to the irradiation of the sample by the 22Na positron source.

Polymer surfaces graphitization by low-energy He+ ions irradiation

2014 ◽  
Vol 116 (6) ◽  
pp. 063715 ◽  
Author(s):  
A. Geworski ◽  
I. Lazareva ◽  
K. Gieb ◽  
Y. Koval ◽  
P. Müller
Keyword(s):  
Low Energy ◽  
Polymer Surfaces

Low energy ion scattering studies of polymer surfaces

1980 ◽  
Vol 6 (3-4) ◽  
pp. 204-224 ◽  
Author(s):  
G.E. Thomas ◽  
G.C.J. van der Ligt ◽  
G.J.M. Lippits ◽  
G.M.M. van de Hei
Keyword(s):  
Low Energy ◽  
Polymer Surfaces ◽  
Ion Scattering ◽  
Low Energy Ion Scattering
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