Crystallization effects in the spinning of fibers from polymer melts

被引:3
|
作者
Ziabicki, A [1 ]
Jarecki, L [1 ]
机构
[1] Inst Podstawowych Problemow Tech, PAN, PL-00049 Warsaw, Poland
关键词
fiber formation; nonisothermal crystallization; stress-induced crystallization; extensional flow; molecular orientation; computer modelling;
D O I
10.14314/polimery.1998.293
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Molecular orientation in, and crystallinity of, polymers decide about fiber properties. Formation of an ordered molecular structure is essential for spinning processes. Mathematical modelling of fiber spinning involves the dynamic equations of (i) energy conservation that governs the heat transfer between the filament and cooling medium (air), (ii) momentum conservative accounting for inertia, air drag, gravity and surface tension, (iii) constitution of a viscous crystallizing fluid, (iv) kinetics of crystallization (coupled with energy and momentum conservation). Crystallization accompanying melt spinning provides for a heat source embedded in the equation of heat conservation. A one-dimensional model involving temperature-and stress-dependent crystallization allowed to describe fiber formation dynamics in a slow-crystallizing polymer melt. A newtonian liquid model was adopted with temperature-only, or both temperature-and crystallization-dependent viscosity of (PET) melt. Crystallization elevates the viscosity of the melt. The calculations performed for fiber spinning in molten PET showed higher take-up velocities to be conducive to shifting the stress-induced oriented crystallization, and thus to the fiber forming process, toward the spinneret outlet. Crystallization increased the filament velocity gradient and the tensile stress rose accordingly.
引用
收藏
页码:293 / 298
页数:6
相关论文
共 50 条
  • [1] Viscosity effects in computer modeling of fiber spinning from crystallizing polymer melts
    Jarecki, L
    Ziabicki, A
    POLIMERY, 2004, 49 (02) : 101 - 109
  • [2] A DEVICE FOR STUDIES OF THE EARLY STAGES OF POST-SPINNING CRYSTALLIZATION IN POLYMER FIBERS
    HRISTOV, HA
    SCHULTZ, JM
    POLYMER, 1988, 29 (07) : 1211 - 1215
  • [3] CRYSTALLIZATION OF SHEARED POLYMER MELTS
    KOBAYASHI, K
    NAGASAWA, T
    JOURNAL OF MACROMOLECULAR SCIENCE-PHYSICS, 1970, B 4 (02): : 331 - +
  • [4] CRYSTALLIZATION IN POLYMER MELT SPINNING
    GUPTA, RK
    AUYEUNG, KF
    JOURNAL OF APPLIED POLYMER SCIENCE, 1987, 34 (07) : 2469 - 2484
  • [5] STRUCTURE DEVELOPMENT AND CRYSTALLIZATION FROM ORIENTED POLYMER MELTS
    KATAYAMA, K
    JOURNAL OF RHEOLOGY, 1980, 24 (03) : 333 - 333
  • [6] Effects of the degree of undercooling on flow induced crystallization in polymer melts
    Coppola, S
    Balzano, L
    Gioffredi, E
    Maffettone, PL
    Grizzuti, N
    POLYMER, 2004, 45 (10) : 3249 - 3256
  • [7] Shear flow effects on polymer melts crystallization: Kinetics features
    Bove, L
    Nobile, MR
    MACROMOLECULAR SYMPOSIA, 2002, 180 : 169 - 180
  • [8] SPINNING OF PROTEIN POLYMER FIBERS
    CAPPELLO, J
    MCGRATH, KP
    SILK POLYMERS: MATERIALS SCIENCE AND BIOTECHNOLOGY, 1994, 544 : 311 - 327
  • [9] Dynamics of hot-tube spinning from crystallizing polymer melts
    Jarecki, L
    Ziabicki, A
    Blim, A
    COMPUTATIONAL AND THEORETICAL POLYMER SCIENCE, 2000, 10 (1-2): : 63 - 72
  • [10] DEFORMATION OF PROFILED THREADS IN THE COURSE OF FORMING (SPINNING) FROM POLYMER MELTS
    SVISTUNOV, VA
    GENIS, DV
    REIN, KM
    VOLF, LA
    JOURNAL OF APPLIED CHEMISTRY OF THE USSR, 1985, 58 (01): : 131 - 134