Abstract
Temperature dependence of positron annihilation lifetime spectra of polysilanes such as, poly(methyl- n-propylsilane) (PMPrS) and poly(di- n-hexylsilane) (PDHS) has been investigated. The τ 3 in PMPrS is seen to increase monotonically around the solid–liquid transition temperature. The transition temperature and free volume are observed to depend on the molecular weight and/or packing of the backbones. For PDHS, a sharp change in τ 3 and I 3 is seen at the solid–solid transition temperature. Free volume radius probability density functions, above and below the transition temperature, are presented in PMPrS and PDHS. Positron studies are complimented by conventional thermal analysis studies.
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