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Free volume properties in liquid crystals studied by positron annihilation

โœ Scribed by Ch. Zhao; Y. Ujihira

Book ID
112673227
Publisher
Springer
Year
1996
Tongue
English
Weight
387 KB
Volume
211
Category
Article
ISSN
1588-2780

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Free volumes in polystyrene probed by po
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Free volume characteristics in three samples of monodisperse polystyrene were investigated by positron annihilation technique over a temperature range from 300 to 380 K. The numberaverage molecular weight of the samples ranged from 5730 to 1,524,000. The observed lifetime spectra were resolved into

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Ah&met-The method of positron annihilation was used to study changes of free volume in polycarbonate. Annealing at 180ยฐC 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