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Issue 32, 2018
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Synthesis of nylon 1 in supercritical carbon dioxide and its crystallization behavior effect on nylon 11

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Abstract

Nylon 1 (PA1), with the highest density of hydrogen bonds and dipoles among odd-numbered nylons, was synthesized in supercritical carbon dioxide using urea as the raw material. In this method, CO2 not only played the role of a reaction mediator but also acted as an absorbent of the small molecular by-product (NH3). The chemical structures of PA1 were characterized by means of Fourier transform infrared spectroscopy, 13C NMR, intrinsic viscosity, energy dispersive spectrometry and WAXD. A sharp and intense diffraction peak occurred at 27.68°, indicating its highly crystalline nature. The obtained PA1 was quite thermally stable below 340.0 °C, and temperatures at 2% and 5% weight loss were 340.4 and 378.0 °C, respectively. The glass transition temperature (Tg) of PA1 was 135.4 °C. The crystallization behavior effect on nylon 11 after adding PA1 was investigated by DSC. The results showed that both the crystallinity degree and crystallization rate of nylon 11 increased with the addition of PA1 according to isothermal and non-isothermal crystallization analyses. The PA1, a new family member of nylons, is a potential multifunctional material and can serve as a high-performance material in many areas.

Graphical abstract: Synthesis of nylon 1 in supercritical carbon dioxide and its crystallization behavior effect on nylon 11

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Publication details

The article was received on 21 May 2018, accepted on 10 Jul 2018 and first published on 14 Jul 2018


Article type: Paper
DOI: 10.1039/C8CE00821C
Citation: CrystEngComm, 2018,20, 4676-4684
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    Synthesis of nylon 1 in supercritical carbon dioxide and its crystallization behavior effect on nylon 11

    D. Yuan, J. Bao, Y. Ren, W. Li, L. Huang and X. Cai, CrystEngComm, 2018, 20, 4676
    DOI: 10.1039/C8CE00821C

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