| 聚乙二醇的等温结晶动力学 |
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| 引用本文： | 程广文,范晓东.聚乙二醇的等温结晶动力学[J].高分子材料科学与工程,2009(7). |
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| 作者姓名： | 程广文 范晓东 |
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| 作者单位： | 西北工业大学应用化学系; |
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| 基金项目： | 国防科工委‘十一五’计量重点项目(J142006A201) |
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| 摘 要： | 用差示扫描量热仪(DSC)研究了聚乙二醇(PEG)的等温结晶动力学。结果表明,在较高温度下处理PEG后,等温结晶过程中,Avrami指数n≈4,表明PEG以均相成核的三维球晶方式生长,同时计算得到结晶活化能为72.013 kJ/mol;而在较低温度处理PEG后,等温结晶过程中,Avrami指数n≈3,表明PEG以异相成核的三维球晶方式生长,结晶活化能为234.791 kJ/mol,比较高温处理后的结晶活化能高,说明PEG的结晶能力随热处理温度的降低而降低。
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| 关 键 词： | 聚乙二醇 等温结晶动力学 成核机理 |
Isothermal Crystallization Kinetics of Polyethylene Glycol |
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| CHENG Guang-wen,FAN Xiao-dong.Isothermal Crystallization Kinetics of Polyethylene Glycol[J].Polymer Materials Science & Engineering,2009(7). |
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| Authors: | CHENG Guang-wen FAN Xiao-dong |
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| Affiliation: | CHENG Guang-wen,FAN Xiao-dong(Department of Applied Chemistry,Northwestern Polytechnical University,Xi'an 710072,China) |
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| Abstract: | The isothermal crystallization kinetics of polyethylene glycol was studied by means of differential scanning calorimetry.It is found that the value of Avrami index,n,is about 4,demonstrating a three-dimensional spherulitic growth on homogeneous nuclei and the activation energy of crystallization obtained from Arrhenius equation is 72.013 kJ/mol during the isothermal crystallization of PEG.However,when the melting temperature of PEG declines,the value of Avrami index becomes about 3,suggesting the crystalliz... |
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| Keywords: | polyethylene glycol isothermal crystallization kinetics nucleation mechanism |
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