Ah&met-The method of positron annihilation was used to study changes of free volume in polycarbonate. Annealing at 180Β°C and pressure 808 MPa causes significant changes of free volume (-23%) compared to nonannealed polycarbonate. The free volume compressibility was estimated to be -3.10-' MPa-'. The
Study on the influence of the free volume of hybrid membrane on pervaporation performance by positron annihilation spectroscopy
β Scribed by Chi-Lan Li; Shu-Hsien Huang; Wei-Song Hung; Se-Tsung Kao; Da-Ming Wang; Y.C. Jean; Kueir-Rarn Lee; Juin-Yih Lai
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 693 KB
- Volume
- 313
- Category
- Article
- ISSN
- 0376-7388
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Positron annihilation lifetime (PAL) measurements are reported on a series of chemically different cured epoxy resin systems. Analysis of PAL data yields indicates the effects of changes in the cure temperature and chemical structure on the average molecular free volume size. A comparison of PAL wit
## Abstract Two types of chitosan (CS), Ξ± and Ξ², were blended with different concentrations of starch and cast to obtain films. The addition of 1% glycerol was used as a plasticizer to increase film flexibility. The properties of the obtained films were studied by positron annihilation lifetime spe