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

Abstract

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

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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, Accepted Manuscript
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    Synthesis of nylon 1 in supercritical carbon dioxide and its crystallization behavior effect on nylon 11

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

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