| STRUCTURE EVOLUTION OF POLYMER CHAINS FOR NECKING FORMATION IN HIGH-SPEED FIBER SPINNING PROCESS |
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| 作者姓名： | Hong Zheng Wei Yu Hon-bin Zhang Chi-xing Zhou |
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| 作者单位： | Department of Polymer Materials Science ＆ Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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| 基金项目： | 中国科学院资助项目
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the Doctoral Foundation of National Education Committee of China
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国家科技攻关项目 |
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| 摘 要： | Finite element method is used to simulate the high-speed melt spinning process,based on the equation system proposed by Doufas et al.Calculation predicts a neck-like deformation,as well as the related profiles of velocity,diameter, temperature,chain orientation,and crystallinity in the fiber spinning process.Considering combined effects on the process such as flow-induced crystallization,viscoelasticity,filament cooling,air drag,inertia,surface tension and gravity,the simulated material flow behaviors are consistent with those observed for semi-crystalline polymers under various spinning conditions.The structure change of polymer coils in the necking region described by the evolution of conformation tensor is also investigated.Based on the relaxation mechanism of macromolecules in flow field different types of morphology change of polymer chains before and in the neck are proposed,giving a complete prospect of structure evolution and crystallization of semi-crystalline polymer in the high speed fiber spinning process.
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| 关 键 词： | 半晶态聚合体 结晶化 高速纤维纺丝工艺 结构形态 有限元方法 |
| 收稿时间： | 2004-12-10 |
| 修稿时间： | 2005-02-25 |
Structure Evolution of Polymer Chains for Necking Formation in High-Speed Fiber Spinning Process |
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| Hong Zheng Wei Yu Hon-bin Zhang Chi-xing Zhou.STRUCTURE EVOLUTION OF POLYMER CHAINS FOR NECKING FORMATION IN HIGH-SPEED FIBER SPINNING PROCESS[J].Chinese Journal of Polymer Science,2006,0(1):1-11. |
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| Authors: | Hong Zheng Wei Yu Hong-bin Zhang Chi-xing Zhou |
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| Institution: | Department of Polymer Materials Science & Engineering, Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract: | Finite element method is used to simulate the high-speed melt spinning process, based on the equation system proposed by Doufas et al. Calculation predicts a neck-like deformation, as well as the related profiles of velocity, diameter, temperature, chain orientation, and crystallinity in the fiber spinning process. Considering combined effects on the process such as flow-induced crystallization, viscoelasticity, filament cooling, air drag, inertia, surface tension and gravity, the simulated material flow behaviors are consistent with those observed for semi-crystalline polymers under various spinning conditions. The structure change of polymer coils in the necking region described by the evolution of conformation tensor is also investigated. Based on the relaxation mechanism of macromolecules in flow field different types of morphology change of polymer chains before and in the neck are proposed, giving a complete prospect of structure evolution and crystallization of semi-crystalline polymer in the high speed fiber spinning process. |
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| Keywords: | Semi-crystalline Polymer Crystallization High-speed Fiber Spinning Process Conformation Finite Element Method (FEM) |
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