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Synthesis and characterization of thermostable hyperbranched epoxy resin for surface coating applications

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Abstract

A hyperbranched epoxy resin has been synthesized by using epichlorohydrin, bisphenol-A, and hyperbranched polyether polyol by a low-temperature polycondensation technique in the presence of a base. The reaction parameters of this polycondensation reaction were optimized, and 5 N aqueous sodium hydroxide solution, (54 ± 1) °C reaction temperature and 3 h reaction time were found to be the best. The degree of branching of the resin was found to be 0.57 as determined from 13C nuclear magnetic resonance spectroscopy (Fig. 3). This hyperbranched epoxy resin was cured with poly(amido amine) hardener at 120 °C for a specified period of time. The resin exhibits very good crosscut adhesive strength (100%). The cured films showed moderate impact strength (60 cm), good scratch resistance (5.5 kg), good gloss (82 at 60°), thermostability up to 270 °C, and good chemical resistance in various chemical media. All these results indicate its suitability to be used as an advanced surface coating material.

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Acknowledgments

One of the authors, Buddhadeb Roy expresses his sincere gratitude to University Grant Commission (UGC), Delhi (India), for the financial assistance as Rajib Gandhi National Fellowship (RGNF). The author also thanks Central Instrumentation Facility, Tezpur University, India, for help in analysis and testing of the samples. The authors express their sincere thanks for departmental financial assistance to the SAP (UGC) New Delhi, India, through grant No. F.3-30/2009 (SAP-11) and Fund for Improvement of Science & Technology Infrastructure (FIST) program 2009, DST New Delhi, India, through Grant No. SR/FST/CSI-203/209/1.

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  1. Advanced Polymer and Nanomaterial Laboratory, Department of Chemical Sciences, Tezpur University, Tezpur, 784028, Assam, India

    Buddhadeb Roy & Niranjan Karak

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  1. Buddhadeb Roy
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  2. Niranjan Karak
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Correspondence to Niranjan Karak.

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Roy, B., Karak, N. Synthesis and characterization of thermostable hyperbranched epoxy resin for surface coating applications. Journal of Materials Research 27, 1806–1814 (2012). https://doi.org/10.1557/jmr.2012.86

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