Article
  • Kinetic Study of Cyclization of High-Tacticity Polyacrylonitrile Heat-Treated under Air Atmosphere via XRD
  • Xu ZX, Xu J, Xu LH, Dai YQ, Xue LW, Jin RG
  • 공기분위기 하에서 열처리된 고입체 규칙성 폴리아크릴로니트릴의 XRD에 의한 환화반응 속도 연구
  • Xu ZX, Xu J, Xu LH, Dai YQ, Xue LW, Jin RG
Abstract
Two different polyacrylonitrile samples (PANs, triad tacticity fraction is 0.25 and 0.64) were synthesized and used to study the kinetics of cyclization. Polymers were treated at different temperatures between 250 to 300 ℃ under air atmosphere, and analyzed by X-ray diffractometer. The sharp and strong peak at 2θ＝16.5o corresponds to a lateral repeat distance that is the (100) diffraction in hexagonal lattice, while the peak at 2θ＝25.5o reflects the (101) diffraction. In comparing their areas of different heat treated samples, the cyclization of both PANs was identified as a first-order reaction. The rate constants of cyclization reaction at different temperatures and the active energy parameter were obtained. This results might provide an important effect on pre-oxidation of polyacrylonitrile fiber.

Keywords: high-tacticity polyacrylonitrile; cyclization; kinetics

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2022 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 2008; 32(2): 150-156

    Published online Mar 25, 2008

  • Received on Dec 13, 2007
  • Accepted on Jan 18, 2008