ISSN:
1588-2780
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Energy, Environment Protection, Nuclear Power Engineering
Notes:
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 f −1 for study of viscoelastic state of polymers is demonstrated.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02056396
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