| 利用~1H-NMR研究HDPE/PET/EVA共混体系的酯交换反应 |
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| 引用本文： | 何慧,沈家瑞.利用~1H-NMR研究HDPE/PET/EVA共混体系的酯交换反应[J].高分子学报,2001,46(1):90-93. |
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| 作者姓名： | 何慧 沈家瑞 |
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| 作者单位： | 华南理工大学高分子系 |
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| 基金项目： | 广东省自然科学基金，990619， |
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| 摘 要： | 本文在选用EVA作为HDPE/PET共混体系增容剂的基础上 ,通过双螺杆反应挤出熔融加工过程 ,促使EVA侧基上的酯基官能团与PET组分主链上的酯基在适当催化剂———有机金属化合物存在的条件下发生酯交换反应 .1H NMR结果表明 ,酯交换反应的产生在共混体系界面原位形成接枝或交联的PET EVA共聚物 ,且主要是以生成接枝共聚物的反应为主 .
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| 关 键 词： | HDPE/PET/EVA共混体系 酯交换反应 核磁共振(~1H-NMR) 原位增容 |
| 修稿时间： | 2000年1月2日 |
STUDY ON TRANSESTERIFICATION OF HDPE/PET/EVA BLENDS BY 1H-NMR |
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| HE Hui,Shen Jiarui.STUDY ON TRANSESTERIFICATION OF HDPE/PET/EVA BLENDS BY 1H-NMR[J].Acta Polymerica Sinica,2001,46(1):90-93. |
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| Authors: | HE Hui Shen Jiarui |
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| Abstract: | HDPE and PET are known to be imcompatible polymers.To improve the properties of HDPE/PET blends,ethylene vinyl acetate copolymer(EVA) was used as a compatibilizer in this system.Owing to chemical structure similarities,EVA displays some miscibility with HDPE.On the other hand,ester groups of EVA can react with the polyester macromolecules and form PET-EVA copolymers as compatibilizers in situ during reactive processing through twin screw extruder by transesterification reactions in the presence of catalyst-organometallic compound.The results of \{\}1H-NMR show that grafted or co-crosslinked copolymers PET-EVA was generated at the interface of blends by transesterification during processing operation with organometallic compound,which enhanced the compatibilization of HDPE/PET blends.Transesterification reaction between PET and EVA led to a grafted copolymer mainly. |
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| Keywords: | HDPE/PET/EVA blends Transesterification Nuclear Magnetic Resonance(\{\}\+1H\|NMR) In\|situ compatibilization |
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