Positron annihilation lifetime spectroscopy of poly(ethylene terephthalate): Contributions from rigid and mobile amorphous fractions

被引：62

作者：

Olson, BG

Lin, J

Nazarenko, S

Jamieson, AM ^{[1
]}

机构：

[1] Case Western Reserve Univ, Dept Macromol Sci & Engn, Cleveland, OH 44106 USA

[2] Case Western Reserve Univ, Dept Phys, Cleveland, OH 44106 USA

来源：

MACROMOLECULES | 2003年 / 36卷 / 20期

关键词：

D O I：

10.1021/ma034813u

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Systematic divergences in the orthopositronium (o-Ps) annihilation lifetimes, tau(3), and intensities, I-3, are observed, when comparing melt-crystallized and cold-crystallized poly(ethylene terephthalate) (PET) as a function of crystallinity. Following a previous analysis of corresponding deviations in oxygen permeability, the divergences in I-3 and tau(3) are traced to distinct characteristic values for the probability of o-Ps formation and o-Ps lifetime in the rigid amorphous phase (RAF) associated with the crystalline lamellae and the mobile amorphous regions (MAF) which are unperturbed by the presence of the crystal phase. Utilizing independent information on the volume fractions of RAF and MAF, a quantitative analysis of the o-Ps annihilation parameters is possible.

引用

页码：7618 / 7623

页数：6

共 39 条

[11] A FREE 4-TERM ANALYSIS OF POSITRON LIFETIME SPECTRA OF GAMMA-IRRADIATED TEFLON [J].