Published 2000 | Version v1
Journal article Metadata-only

Positron annihilation spectroscopy (PALS) the effect of crosslinking on free volume size in poly-methyl-methacrylate

Creators

  • 1. Institute of Physics, Faculty of Natural Sciences and Mathematics, St. 'Cyril and Methodius' University, Skopje (Macedonia, The Former Yugoslav Republic of)

Description

Positron annihilation Spectroscopy (PALS) is used for analyzing the samples of polymethyl-methacrylate (PMMA) with different contents of crosslinks. The measurements are performed at room temperature. The times of life (τ1, τ2, τ3) and the intensities (II, I2, 13) of para-positronium, the free positrons and the orto-positrons are calculated for each type of polymer, but only (τ3) and (I3) are of interest because we can calculate the size of free volume. It is shown that the radius of free volume is proportional to the crosslinking density. Defects of sizes in the range of 0.1 to 1 nm are detected with Positron Spectroscopy, while other techniques do not give results. (Original)

Additional details

Publishing Information

Journal Title
Physica Macedonica
Journal Volume
50
Journal Page Range
p. 19-26
ISSN
1409-7168

INIS

Country of Publication
North Macedonia, Republic of
Country of Input or Organization
North Macedonia, Republic of
INIS RN
34017663
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Resource subtype / Literary indicator
Numerical Data
Descriptors DEI
ANNIHILATION; CROSS-LINKING; EXPERIMENTAL DATA; LIFETIME; MICROSTRUCTURE; PMMA; POSITRONIUM; POSITRONS; SPECTROSCOPY; VOLUME
Descriptors DEC
ANTILEPTONS; ANTIMATTER; ANTIPARTICLES; CHEMICAL REACTIONS; DATA; ELEMENTARY PARTICLES; ESTERS; FERMIONS; INFORMATION; INTERACTIONS; LEPTONS; MATTER; NUMERICAL DATA; ORGANIC COMPOUNDS; ORGANIC POLYMERS; PARTICLE INTERACTIONS; POLYACRYLATES; POLYMERIZATION; POLYMERS; POLYVINYLS

Optional Information

Notes
12 refs., 7 figs.