Free volume from the viewpoint of positron annihilation lifetime spectroscopy and small-angle x-ray scattering

2000 ◽  
Author(s):  
Marian Kryszewski
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Small Angle ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
X Ray ◽  
Positron Annihilation Lifetime ◽  
X Ray Scattering ◽  
Ray Scattering

Free volume and lamellar structure of poly vinyl alcohol-nanosized BaTiO3 composite: Positron annihilation and small angle X-ray scattering study

2016 ◽  
Vol 84 ◽  
pp. 100-110 ◽  
Author(s):  
Sandeep K. Sharma ◽  
Jyoti Prakash ◽  
Jitendra Bahadur ◽  
Manjulata Sahu ◽  
Subhashish Mazumder ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Free Volume ◽  
Small Angle ◽  
Vinyl Alcohol ◽  
Lamellar Structure ◽  
Poly Vinyl Alcohol ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Study ◽  
Ray Scattering

Changes In The Characteristics Of The Free Volume Of Glassy Polymers During Deformation And Relaxation.

1991 ◽  
Vol 227 ◽  
Author(s):  
M.I. Tsapovestsky ◽  
V.K. Lavrentiev ◽  
S.A. Tishin
Keyword(s):  
Dielectric Loss ◽  
Positron Annihilation ◽  
Free Volume ◽  
Small Angle ◽  
Mechanical Tests ◽  
Glassy Polymers ◽  
Volume Relaxation ◽  
X Ray ◽  
X Ray Scattering ◽  
Original Interpretation

ABSTRACTThe behavior of glassy polymers was studied with the aid of mechanical tests on the basis of free volume. Three types of experiments were carried out and interpreted using modern ideas about the structure of free volume. They were: 1. The study of changes in the total free volume occurring as a result of deformation (by measurement of density) 2. The study of micro voids and their changes on deformation using small angle X-ray scattering (SAXS) and positron annihilation 3. The study of mobile regions by the measurement of dielectric loss (using an original interpretation) during deformation. This allows several parts of the total free volume to be distinguished and investigated. A model for the free volume relaxation during deformation is proposed.

A Microstructural Study of Acrylic-Modified Chitosan by Means of PALS and SAXS

2017 ◽  
Vol 373 ◽  
pp. 265-268
Author(s):  
Pablo Anbinder ◽  
Carlos Macchi ◽  
Javier Amalvy ◽  
Alberto Somoza
Keyword(s):  
Chemical Modification ◽  
Positron Annihilation ◽  
Small Angle ◽  
Butyl Acrylate ◽  
Microstructural Study ◽  
X Ray ◽  
Positron Annihilation Lifetime ◽  
Modified Chitosan ◽  
X Ray Scattering ◽  
Enhanced Properties

Chemical modification of chitosan, specially grafting with different polymers is an important strategy in the production of bio-based materials with enhanced properties. In the present study, chitosan was grafted with n-butyl acrylate, in a surfactant-free emulsion polymerization. Stable dispersions with high grafting efficiency were obtained and the microstructure of the casted films was analyzed by positron annihilation lifetime spectroscopy and small angle X-ray scattering. Results are discussed in terms of the number and distribution of the grafting sites.

Revealing the Nano-Level Molecular Packing in Chitosan-NiO Nanocomposite by Using Positron Annihilation Spectroscopy and Small-Angle X-ray Scattering

ChemPhysChem ◽  
2013 ◽  
Vol 14 (5) ◽  
pp. 1055-1062 ◽  
Author(s):  
Sandeep K. Sharma ◽  
Jitendra Bahadur ◽  
Pushkar N. Patil ◽  
Priya Maheshwari ◽  
Saurabh Mukherjee ◽  
...  
Keyword(s):  
Positron Annihilation ◽  
Small Angle ◽  
Positron Annihilation Spectroscopy ◽  
Molecular Packing ◽  
X Ray ◽  
X Ray Scattering ◽  
Ray Scattering
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