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HomeMaterials Science ForumMaterials Science Forum Vols. 445-446The Effect of Plasticizer on the Free Volume in...

The Effect of Plasticizer on the Free Volume in Metolose Systems

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Periodical:

Materials Science Forum (Volumes 445-446)

Pages:

325-327

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.445-446.325

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Online since:

January 2004

Authors:

Tamás Marek, Károly Süvegh, Romána Zelkó, Géza Regdon Jr., Klára Pintye-Hódi, Attila Vértes

Keywords:

Free Volume, Metolose, o-Ps LifeTime, Phase Separation, Plasticizer Effect

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© 2004 Trans Tech Publications Ltd. All Rights Reserved

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[1] B. C. Lippold, R.M. Pagés: Pharmazie 56 (2001), p.5.

[2] R. Zelkó, Á. Orbán, K. Süvegh, Z. Riedl, I. Rácz: Int. J. Pharmaceut. 244 (2002), p.81.

[3] P. Kirkegaard, M. Eldrup, O.E. Mogensen, N.J. Pedersen: Comput. Phys. Commun. 23 (1981), p.307.

20 40 60 80 100 -10 -5.

[5] [10] [55] [60] [65] [70] [75] [80] Metolose SM-4 reference PEG400 reference DTA peak position (°C) PEG concentration in film (m/m%) Figure 2: The position of the observed peaks (open symbols) in the DTA curves of the studied films together with the reference materials (solid diamonds).

20 40 60 80 1. 8 1. 9 2. 0 2. 1 2. 2 2. 3 2. 4 2. 5 (a) PEG concentration in film (m/m%) �3 (ns).

20 40 60 80 12.

[14] [16] [18] (b) I3 (%) Figure 3: The lifetime (a) and the formation intensity (b) of ortho-positronium atoms in Metolose/PEG films. Several parallel spectra were measured at every concentration, so, each point indicates an individual measurement.