Positron annihilation lifetime and gas permeation studies of energetic ion-irradiated polycarbonate membranes

被引：13

作者：

Wate, S

Acharya, NK

Bhahada, KC

Vijay, YK ^{[1
]}

Tripathi, A

Avasthi, DK

Das, D

Ghughre, S

机构：

[1] Univ Rajasthan, Dept Phys, Jaipur 302004, Rajasthan, India

[2] Govt Arts & Sci Coll, Dept Phys, Ratlam 457001, Madhya Pradesh, India

[3] Ctr Nucl Sci, New Delhi 110067, India

[4] Inter Univ Consortium DAE Facil, Kolkata 700091, W Bengal, India

来源：

RADIATION PHYSICS AND CHEMISTRY | 2005年 / 73卷 / 05期

关键词：

positron annihilation spectroscopy; ion-beam; latent tracks; cross-linking; scission; free volume; gas permeation in membranes;

D O I：

10.1016/j.radphyschem.2004.09.018

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The polycarbonate membranes of 40-50 mu m thicknesses were prepared by the solution cast method. These films were irradiated by a 60 MeV, C5+ ion beam with the fluence of 5 x 10(6), 4 x 10(8) and 1 X 10(12) ions cm(-2). The ion beam effects were studied by the positron annihilation lifetime technique. The ortho-positronium (o-Ps) lifetime shows an increase with the ion dose 5 x 106, 4 x 10(8) ions cm(-2). For the films irradiated to the fluence of 1 X 10(12) ions cm(-2), the o-Ps lifetime falls to the lower value. The results are interpreted in terms of change in the free volume. The gas permeability measurements also indicate an increase in the free volume in the samples irradiated up to the fluence of the 4 x 10(8) ions cm(-2). (c) 2004 Elsevier Ltd. All rights reserved.

引用

页码：296 / 301

页数：6

共 29 条

[1]

[Anonymous], 1973, POLYM CHEM PHYS MODE

[2] FREE-VOLUME DISTRIBUTIONS OF AN EPOXY POLYMER PROBED BY POSITRON-ANNIHILATION - TEMPERATURE-DEPENDENCE [J].