Abstract
The temperature dependence of positron annihilation characteristics,τ 3 andI 3, has been studied on sample of poly(butadiene), poly(isobutylene) and poly(chloroprene). The temperature range was between 15 and 470 K. The rate of expansion of holes or free-volume in all samples was deduced belowT g as well aboveT g as appr. 3·10−3 K−1 and 2·10−2 K−1, respectively. These values are very close to the rate of the mean squared displacement of scatterer<r 2>observed in neutron scattering experiments. A possibility to use an inverse value of free-volume,V −1 f for study of viscoelastic state of polymers is demonstrated.
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Krištiak, J., Šauša, O., Bandžuch, P. et al. On the expansion of hole in main chain polymers determined by positron annihilation. Journal of Radioanalytical and Nuclear Chemistry, Articles 210, 563–570 (1996). https://doi.org/10.1007/BF02056396
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DOI: https://doi.org/10.1007/BF02056396