| Effect of final heating temperature on crystallization of isotactic polypropylene nucleated with an aryl amide derivative as <Emphasis Type="Italic">β</Emphasis>-form nucleating agent |
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| 引用本文： | 于建.Effect of final heating temperature on crystallization of isotactic polypropylene nucleated with an aryl amide derivative as β-form nucleating agent[J].高分子科学,2011,29(3):308-317. |
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| 作者姓名： | 于建 |
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| 作者单位： | Institute of Polymer Science and Engineering,Department of Chemical Engineering,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China |
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| 摘 要： | An aryl dicarboxylic acid amide compound TMB-5 is an efficientβ-form nucleating agent for isotactic polypropylene(iPP).Because of the solubility of TMB-5,superstructure and morphology of iPP crystals changed with melting conditions.Effects of final heating temperature(T_f)on heterogeneous nucleation of iPP/TMB-5 were investigated.It was discovered that the crystallization temperature increased with decreasing T_f value.The optical microscopic images indicated that when TMB-5 partially dissolved in iPP melt,the remaining(non-dissolved)TMB-5 facilitated the recrystallization of dissolved nucleating agent from the melt,which promoted crystallization.Complete solubility of nucleating agent caused the decreasing efficiency.TMB-5 recrystallized in the form of tiny needles,whose aggregates induced dendritic iPP crystals.
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| 关 键 词： | Isotactic polypropylene Heterogeneous nucleation Crystallization Polymer processing Melting temperature |
| 收稿时间： | 4 February 2010 |
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