Free-volume studies in polycaprolactone/poly (propylene oxide) urethane/urea membranes by positron lifetime spectroscopy

被引：0
|
作者：
Marques, M. F. Ferreira [1 ,2 ]
Gordo, P. M. [2 ]
de Lima, A. P. [2 ]
Queiroz, D. P. [3 ]
de Pinho, M. Norberta [3 ]
Major, P. [4 ]
Kajcsos, Zs. [4 ]
机构：
[1] Inst Super Engn, Dept Chem Engn, P-3031199 Coimbra, Portugal
[2] Univ Coimbra, ICEMS, Dept Phys, P-3004516 Coimbra, Portugal
[3] Inst Super Tecn, Dept Chem Engn, P-1049001 Lisbon, Portugal
[4] KFKI Res Inst Particle & Nucl Phys, H-1525 Budapest, Hungary
来源：
ACTA PHYSICA POLONICA A | 2008年 / 113卷 / 05期
关键词：
D O I：
暂无
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Positron annihilation lifetime spectroscopy was used to study the free volume parameters in polypropylene oxide-based tri-isocyanate terminated prepolymer/polycaprolactone diol bi-soft urethane/urea membranes (PU/PCL) with PCL content from 5 up to 25 wt%. Positron annihilation lifetime spectroscopy measurements carried out in the temperature range 298-324 K mirrored the phase separation of the various soft and hard segments present in the membranes. The size and amount of free volume holes determined by positron annihilation lifetime spectroscopy appear to be correlated with the CO2 gas permeability through the membranes.
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页码：1359 / 1364
页数：6
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