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Free volume microstructure of amorphous polymers at glass transition temperatures from positron annihilation spectroscopy data

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Abstract

The analysis of annihilation characteristics of ortho-positronium at conventional calorimetric glass transition temperatures for a series of amorphous polymers reveals empirical correlations of average lifetime of o-Ps\({\rm{\bar \tau }}_{{\rm{3g}}} \), and of its product with a relative intensityI 3g with appropriateT DSCg values. These trends in terms of free volume mean that both the average size of free volume hole entityv hg and the fractional free volume grow with increasingT DSCg . The results are discussed considering the chemical microstructure as well as possible mechanisms acting in glass transition. A relation is indicated between geometric and flexibility characteristics of chains and thev hg andf g parameters of free volume microstructure on the one side and potential motional processes responsible for solidification of the amorphous system on the other side.

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  1. Polymer Institute, Slovak Academy of Sciences, Dúbravská Cesta 9, 842 36, Bratislava, Slovak Republic

    J. Dr Bartoš

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  1. J. Dr Bartoš
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Dr Bartoš, J. Free volume microstructure of amorphous polymers at glass transition temperatures from positron annihilation spectroscopy data. Colloid Polym Sci 274, 14–19 (1996). https://doi.org/10.1007/BF00658904

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  • DOI: https://doi.org/10.1007/BF00658904

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