Abstract
Carbon black (CB) is essentially carbon in the form of extremely fine particle aggregates (100-200nm) having an amorphous molecular structure. Oil absorption or compressed dibutyl phthalate (CDBP) and iodine adsorption or nitrogen surface area (N2SA) are parameters commonly used to describe CB morphology or structure and the surface area of CB available for reaction with rubber. We have used both positron lifetime and Doppler broadening spectroscopy to study these two parameters for a variety of rubber CB composite samples. The o-Ps pickoff lifetime depends only on the type of rubber and is independent of CDBP and N2SA. However, the o-Ps lifetime intensity, I3, and the S parameter decrease with both CDBP and N2SA.
Highlights
Carbon black (CB) [2] is an industrial product
Compressed dibutyl phthalate (CDBP) and nitrogen surface area (N2SA) are two parameters that describe CB morphology and surface area of CB exposed for reaction with rubber [3,4]
The purpose of this research is to investigate the dependence of the positron annihilation lifetime spectroscopy (PALS) and Doppler broadening spectroscopy (DBS) on these two CB parameters for a variety of rubber CB composite samples
Summary
Carbon black (CB) [2] is an industrial product. Compressed dibutyl phthalate (CDBP) and nitrogen surface area (N2SA) are two parameters that describe CB morphology and surface area of CB exposed for reaction with rubber [3,4]. The purpose of this research is to investigate the dependence of the positron annihilation lifetime spectroscopy (PALS) and Doppler broadening spectroscopy (DBS) on these two CB parameters for a variety of rubber CB composite samples. The lifetime apparatus was a typical fast-fast coincidence system using BaF2 scintillators, Photonis phototubes and Ortec 583 Constant Fraction Differential Discriminators. The data were collected with an Ortec Trump MCA in a PC computer. Two samples were sandwiched around a 22 a 11 source, 50μCi deposited on nickel foil
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