| 聚对苯二甲酸乙二醇酯扩链产物的分子结构 |
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| 引用本文： | 戴剑峰,俞炜,周持兴.聚对苯二甲酸乙二醇酯扩链产物的分子结构[J].高分子材料科学与工程,2009(10). |
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| 作者姓名： | 戴剑峰 俞炜 周持兴 |
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| 作者单位： | 上海交通大学流变学研究所;上海交通大学化学化工学院; |
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| 基金项目： | 国家自然科学基金资助项目(50390095) |
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| 摘 要： | 采用不同含量的四官能团单体均苯四甲酸酐(PMDA)提高聚对苯二甲酸乙二醇酯(PET)的熔体强度,在增加PET分子量的同时,使PET发生支化反应。频率扫描结果表明,扩链反应显著提高了PET的弹性模量和复数黏度;运用傅立叶变换流变学方法对长支链进行表征,根据三次谐波与基频幅值比与应变的幂律关系,发现在中等应变幅值下,扩链产物的幂律指数n均小于2,表明生成了不同支化程度的支链结构。扩链产物的黏度随扩链剂的增加而增加,但是扩链产物的支化度对扩链剂浓度存在最大值。
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| 关 键 词： | 聚对苯二甲酸乙二醇酯 扩链 支化 流变 |
Molecular Structure of Chain-Extended Poly(Ethylene Terephthalate) |
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| DAI Jian-feng,YU Wei,ZHOU Chi-xing.Molecular Structure of Chain-Extended Poly(Ethylene Terephthalate)[J].Polymer Materials Science & Engineering,2009(10). |
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| Authors: | DAI Jian-feng YU Wei ZHOU Chi-xing |
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| Affiliation: | DAI Jian-feng,YU Wei,ZHOU Chi-xing(Advanced Rheology Institute,School of Chemistry and Chemical Technology,Shanghai Jiao Tong University,Shanghai 200240,China) |
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| Abstract: | The chain extension of poly(ethylene terephthalate)(PET) with a tetra functional monomer,pyromellitic dianhydride(PMDA),has been performed by varying the chain-extender amount to improve the melt strength.The reaction can increase the molecular weight of PET,while leading to chain-extension and branching.The results of frequency sweep test show that the chain-extended PET samples exhibit higher storage modulus and higher complex viscosity.Fourier transform rheology was used to characterize the long chain br... |
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| Keywords: | poly(ethylene terephthalate) chain-extension branching rheology |
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