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13.08.2019 | Polymers & biopolymers

Snail shell-shaped chiral substituted helical polyacetylene: preparation, characterization and infrared emissivity performance

verfasst von: Wenting Wu, Yuming Zhou, Ran Xu, Saichun Hu, Yangjin Wu, Qiang He, Man He, Xiaohai Bu, Qiuli Nan, Xiaoming Yang

Erschienen in: Journal of Materials Science | Ausgabe 22/2019

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Abstract

The first snail shell-shaped helical polyacetylenes (SHPAs) were synthesized from the copolymerization between l-serine-grafted propargylamine (LSA) and propargylamine (PA). The novel structure was obtained at the monomer input proportion of 50%. The monomer (LSA) and copolymers (poly(LSA_m-co-PA_n)) were characterized by ¹H nuclear magnetic resonance, Fourier transform infrared spectroscopy, ultraviolet visible spectroscopy, circular dichroism and transmission electron microscopy. The infrared emissivity of poly(LSA₅₀-co-PA₅₀) investigated at 8–14 μm was 0.451, which was much lower than the other copolymers. This was because the poly(LSA₅₀-co-PA₅₀) could form the obvious intramolecular interaction and self-assembled to a snail-shell shape by intermolecular hydrogen bonding in MeOH solution. Meanwhile, the conjugation performance of the main chain was enhanced. Consequently, the abundant hydrogen bonds formed through N–H and C=O bonding and the strong conjugate properties both could decrease the unsaturation degree, as well as change the heat conduction mode in the molecules, thereby reducing the infrared emissivity. This strategy provided a new direction to achieve the controllable infrared stealth.

Vorheriger Artikel Three-dimensional coaxial multi-nozzle device for high-rate microsphere generation

Nächster Artikel Macro- and micromechanical responses of an elastomeric membrane undergoing biaxial tension by indentation

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Titel: Snail shell-shaped chiral substituted helical polyacetylene: preparation, characterization and infrared emissivity performance
verfasst von: Wenting Wu
Yuming Zhou
Ran Xu
Saichun Hu
Yangjin Wu
Qiang He
Man He
Xiaohai Bu
Qiuli Nan
Xiaoming Yang
Publikationsdatum: 13.08.2019
Verlag: Springer US
Erschienen in: Journal of Materials Science / Ausgabe 22/2019
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-019-03880-3

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