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Synthesis and characterization of UV-curing epoxy acrylate coatings modified with organically modified rectorite

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Abstract

Epoxy acrylate (EA) coatings modified with organically modified rectorite (OREC) were synthesized employing the ultraviolet-curing technique. Two kinds of alkyl ammonium ions, octadecyltrimethylammonium chloride (OTAC) and [2-(methacryloyloxy)ethyl]trimethylammonium chloride (MAOTMA), were used to modify rectorite (REC). The methacrylate functionalities of MAOTMA were capable of reacting with the acrylate groups of EA. The structure of OREC was characterized by FTIR and XRD and the results indicated that the surfactants were successfully intercalated into the REC interlayers via cation exchange process. The morphology of nanocomposites was investigated by SEM and TEM. OREC showed better dispersion in EA matrix compared with unmodified REC. The T g of neat EA obtained by DMA was 75.6°C, while for 5 wt% EA/MAOTMA-REC and EA/OTAC-REC nanocomposites it increased to 76.5 and 80.8°C, respectively. The nanocomposite with 3 wt% loading of OTAC-REC had the highest T g (89.7°C). TGA revealed that the thermal stability of nanocomposites was enhanced by OTAC-REC and MAOTMA-REC and the thermal stability of EA/MAOTMA-REC nanocomposites was better than that of EA/OTAC-REC nanocomposites. The mechanical properties of nanocomposites containing OTAC-REC and MAOTMA-REC were better than those of nanocomposites containing unmodified REC. With increasing OREC content, the adhesive force of nanocomposites decreased slightly and the flexibility increased significantly.

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Acknowledgments

The financial support of National Natural Science Foundation of China (51074053) is gratefully acknowledged.

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Ying Wang, Zhichao Cao, Fengguo Liu & Xiangxin Xue

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  1. Ying Wang
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  2. Zhichao Cao
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  4. Xiangxin Xue
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Correspondence to Xiangxin Xue.

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Wang, Y., Cao, Z., Liu, F. et al. Synthesis and characterization of UV-curing epoxy acrylate coatings modified with organically modified rectorite. J Coat Technol Res 14, 107–115 (2017). https://doi.org/10.1007/s11998-016-9832-2

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  • DOI: https://doi.org/10.1007/s11998-016-9832-2

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