Activation energies derived from the pre-glass transition annealing peaks

被引:19
作者
Vyazovkin, Sergey [1 ]
Dranca, Ion [1 ]
机构
[1] Univ Alabama Birmingham, Dept Chem, Birmingham, AL 35294 USA
关键词
activation energy; beta-relaxation; DSC; kinetics; pharmaceuticals; polymer;
D O I
10.1016/j.tca.2006.04.017
中图分类号
O414.1 [热力学];
学科分类号
摘要
The paper explores the use of the DSC annealing peaks for estimating the activation energies of the beta-relaxation in low and high molecular glassy systems. For the four studied systems that include D-glucose (dextrose), maltitol, poly(methyl methacrylate) and poly(ethylene terephthalate) the estimated values of the activation energy are 59 +/- 10, 71 +/- 6, 73 +/- 12 and 75 +/- 7 kJ mol(-1). These values together with the activation energies determined earlier from the annealing peaks of polystyrene (PS), PS-clay nanocomposite, indomethacin, ursodeoxycholic acid and poly(vinylpyrrolidone) have been compared against the literature values of the activation energies of the beta-relaxation. It is concluded that the DSC estimates typically do not deviate for more than 20% from the reference values obtained by the standard dielectric and mechanical methods. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:140 / 146
页数:7
相关论文
共 49 条
  • [1] RELAXATION IN LIQUIDS, POLYMERS AND PLASTIC CRYSTALS - STRONG FRAGILE PATTERNS AND PROBLEMS
    ANGELL, CA
    [J]. JOURNAL OF NON-CRYSTALLINE SOLIDS, 1991, 131 : 13 - 31
  • [2] Relaxation in glassforming liquids and amorphous solids
    Angell, CA
    Ngai, KL
    McKenna, GB
    McMillan, PF
    Martin, SW
    [J]. JOURNAL OF APPLIED PHYSICS, 2000, 88 (06) : 3113 - 3157
  • [3] AGING EFFECTS ON DYNAMIC SHEAR MODULI AT THE ONSET OF THE DYNAMIC GLASS-TRANSITION IN 2 POLY(ALKYL METHACRYLATE)S
    BEINER, M
    GARWE, F
    SCHROTER, K
    DONTH, E
    [J]. POLYMER, 1994, 35 (19) : 4127 - 4132
  • [4] Bershtein V., 1985, POLYM SCI USSR, V27, P2743, DOI [10.1016/0032-3950(85)90477-0, DOI 10.1016/0032-3950(85)90477-0]
  • [5] BERSHTEIN VA, 1983, POLYM BULL, V9, P98, DOI 10.1007/BF00275575
  • [6] MECHANICAL MOTIONS IN AMORPHOUS AND SEMI-CRYSTALLINE POLYMERS
    BOYER, RF
    [J]. POLYMER, 1976, 17 (11) : 996 - 1008
  • [7] Dielectric relaxation in amorphous poly(ethylene terephthalate) and poly(ethylene 2,6-naphthalene dicarboxylate) and their copolymers
    Bravard, SP
    Boyd, RH
    [J]. MACROMOLECULES, 2003, 36 (03) : 741 - 748
  • [8] Dynamics of the amorphous and crystalline α, γ-phases of indomethacin
    Carpentier, L
    Decressain, R
    Desprez, S
    Descamps, M
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2006, 110 (01) : 457 - 464
  • [9] Dynamic decoupling and molecular complexity of flass-forming maltitol
    Carpentier, L
    Descamps, M
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2003, 107 (01) : 271 - 275
  • [10] TIME-TEMPERATURE SUPERPOSITION AND DYNAMIC MECHANICAL-BEHAVIOR OF ATACTIC POLYSTYRENE
    CAVAILLE, JY
    JOURDAN, C
    PEREZ, J
    MONNERIE, L
    JOHARI, GP
    [J]. JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 1987, 25 (06) : 1235 - 1251