Polymer Bulletin

, Volume 75, Issue 3, pp 1013–1026 | Cite as

Preparation and toughening performance investigation of epoxy resins containing carbon nanotubes modified with hyperbranched polyester

Original Paper
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Abstract

In this paper, the carboxylic multi-walled carbon nanotube (MWCNTs-COOH) was modified with hyperbranched polyester via surface graft, and then the epoxy/MWCNTs-COOH composites were prepared to explore the influences of surface modification of MWCNTs-COOH using hyperbranched polyester on the mechanical performance of the composites. The results of TGA and FT-IR of the grafted MWCNTs-COOH (named MWCNTs-H20) indicated that the hyperbranched polyester was successfully grafted onto MWCNTs-COOH by esterification reaction between carboxyl groups on the surface of MWCNTs-COOH and the hydroxyl groups of hyperbranched polyester. The results of fluorescence microscope elucidate that compared with raw MWCNTs-COOH, the grafted MWCNTs-H20 receives a better dispersion in the epoxy prepolymer. Moreover, MWCNTs-COOH and MWCNTs-H20 were, respectively, added into epoxy prepolymer to prepare the EP/MWCNTs composites. The results of DMA revealed that the addition of MWCNTs-COOH enhanced the low temperature toughness of the neat EP, and the surface grafting of hyperbranched polyester onto MWCNTs-COOH further decreased the glass transition temperature of the composites and exhibited a better performance in the enhancement in toughening EP. The measurement of the mechanical performances and surface morphology revealed that the addition of MWCNTs-H20 enhances tensile strength, elongation at break and Charpy impact strength of the EP/MWCNTs composites significantly, resulting in a better toughness of the composites; however, it had little influence on the Barcol hardness.

Keywords

Epoxy resins Carbon nanotubes Hyperbranched polyester Toughening performance 

Notes

Acknowledgements

We gratefully acknowledge the financial support from the Foundation of Distinguished Young Scholars of Chongqing (CSTC2014JCYJJQ0019) for the financial support.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Chongqing Zhixiang Paving Technology Engineering Co., Ltd.ChongqingChina
  2. 2.College of Polymer Science and EngineeringSichuan UniversityChengduChina

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