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Poly(amidoamine) dendrimer-grafted carbon nanotubes as a hybrid multifunctional curing agent for epoxy-modified polyurethane

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Abstract

Carbon nanotube (CNT) grafted with hyperbranched poly(amidoamine) (PAMAM) dendrimer (CNTD) were used as a multifunctional curing and composite agent of polyurethane (PU) terminated with epoxy units. Amino-functionalized CNT was used as the core for grafting the first generation of PAMAM dendrimer by sequential addition of methyl acrylate and ethylenediamine. Two different epoxy-terminated PUs (PUB and PU-PMDA) were prepared from the reaction of poly(ethylene glycol), excess amounts of hexamethylene diisocyanate, and different chain extenders (1,4-butanediol for PUB and pyromellitic dianhydride (PMDA) for PU-PMDA), and subsequent end group transformation of the isocyanate groups to epoxy functionalities using glycidol. Fourier transform infrared spectra and thermogravimetric analysis (TGA) results showed that CNTD was successfully prepared. TGA thermograms revealed that thermal decomposition of composites were carried out in two main steps related to the soft and hard segments. In addition, char content and thermal stability of the composites were increased with increasing the CNTD content. Most importantly, the PMDA chain extender resulted in high thermal stability of the epoxy-terminated PU composites. X-ray diffraction and scanning and transmission electron microscopies presented morphological and structural properties of nanotubes and hybrid composites.

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Acknowledgements

Iran National Science Foundation (INSF) is highly appreciated for the financial support (Project Number: 99011497).

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Authors and Affiliations

  1. Faculty of Polymer Engineering, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran

    Mohammadreza Izadi, Hanieh Mardani, Hossein Roghani-Mamaqani & Mehdi Salami-Kalajahi

  2. Institute of Polymeric Materials, Sahand University of Technology, P.O. Box 51335-1996, Tabriz, Iran

    Hossein Roghani-Mamaqani & Mehdi Salami-Kalajahi

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  1. Mohammadreza Izadi
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  2. Hanieh Mardani
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  3. Hossein Roghani-Mamaqani
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Correspondence to Hossein Roghani-Mamaqani.

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Izadi, M., Mardani, H., Roghani-Mamaqani, H. et al. Poly(amidoamine) dendrimer-grafted carbon nanotubes as a hybrid multifunctional curing agent for epoxy-modified polyurethane. Carbon Lett. 31, 677–688 (2021). https://doi.org/10.1007/s42823-021-00242-5

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