title: The ability of the Coincidence Doppler Broadening Spectroscopy to characterize polymers containing different chemical elements.
abstract: Hydrocarbon polymers, O-containing, F-containing and Cl-containing polymers are comprehensively studied by Coincidence Doppler Broadening Spectroscopy (CDBS). It is shown that for polymers with different chemical structure, CDBS results can effectively distinguish polar groups CO, CCl, and CF. For polymers with similar chemical structure, the intensity of the element-specific peak in the CDBS ratio curve is dependent not only on the fraction of free positrons, but also on the content of characteristic atom in polymer repeated unit, and the polarity of the polymer molecule. For polymers containing several different polar groups, such as PCTFE (CF & CCl) and PFA (CF & CO), whether the element-specific peak appears or not depends on the amount of the polar groups and its positron capture ability. This work may provide insights into potential applications of CDBS for studying complex polymer systems.
authors.affiliation: Department of Applied Physics, Xi'an University of Sciences and Technology, Xi'an 710054, China. Electronic address: yangjing10@xust.edu.cn.
authors.forename: J
authors.initials: J
authors.lastname: Yang
authors.affiliation: Department of Applied Physics, Xi'an University of Sciences and Technology, Xi'an 710054, China.
authors.forename: T
authors.initials: T
authors.lastname: Zhang
authors.affiliation: Department of Applied Physics, Xi'an University of Sciences and Technology, Xi'an 710054, China.
authors.forename: L A
authors.initials: LA
authors.lastname: Han
authors.affiliation: Institute of High Energy Physics, Chinese Academy of Sciences, No. 19 Yuquan Lu, Beijing 100049, China.
authors.forename: X Z
authors.initials: XZ
authors.lastname: Cao
authors.affiliation: Institute of High Energy Physics, Chinese Academy of Sciences, No. 19 Yuquan Lu, Beijing 100049, China.
authors.forename: R S
authors.initials: RS
authors.lastname: Yu
authors.affiliation: Institute of High Energy Physics, Chinese Academy of Sciences, No. 19 Yuquan Lu, Beijing 100049, China.
authors.forename: B Y
authors.initials: BY
authors.lastname: Wang
keywords: Polar groups; Polymer; Positron annihilation