XIA Yayi1 QI Chenze2 WANG Baoyi3 SUN Xudong2 HU Youhua2 WANG Tianmin4 1. Influence of interfacial polarization and size of free volume hole on positronium formation[J]. Nuclear techniques, 2005, (6): 419-423.
XIA Yayi1 QI Chenze2 WANG Baoyi3 SUN Xudong2 HU Youhua2 WANG Tianmin4 1. Influence of interfacial polarization and size of free volume hole on positronium formation[J]. Nuclear techniques, 2005, (6): 419-423.DOI:
The measurements of positron annihilation lifetime spectra (PALS) have been performed on high impact polystyrene (HIPS)
polypropylene (PP)
high density polyethylene (HDPE)
low density polyethylene (LDPE) and a number of HIPS-PP
HIPS-HDPE and HIPS-LDPE blends. The results show that the longest lifetime component τ3 remains constant during extending PALS measurement for all measured polymers
and corresponding intensity I3 with time decreases only for several polymers. The decrease of I3 is interpreted as a result of electric field build up during prolonged PALS measurement. The constant I3 with time has been found to correlate with interfacial polarization during measurement and larger size of free volume holes in the polymers.