Symmetrical diynylic N-arylcarbamate molecules with different numbers of CH2 groups in spacers

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The photopolymerization of Langmuir-Schaefer films of diacetylene N-arylcarbamate symmetrical molecules containing different numbers of methylene groups in the molecules was studied. The result of diyne films UV irradiation was the effective transition of the films into the stable state of blue phase polydiacetylene. The number of CH2 groups in the molecules affected the efficiency of the monomers film transition into the polymer and the conjugation length of the polymer chains. Studying the morphology of the films using scanning electron microscopy showed the horizontal position of diyne molecules on the substrates in the state of domains, the sizes of which depended on the number of CH2 groups in the molecules.

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作者简介

A. Alekseev

A.M. Prokhorov General Physics Institute of the Russian Academy of Science

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Email: alexanderalekseev@yandex.ru
俄罗斯联邦, Moscow

S. Vyaz’min

Zh.I. Alferov Federal State Budgetary Institution of Higher Education and Science St. Petersburg National Research Academic University of the Russian Academy of Science

Email: alexanderalekseev@yandex.ru
俄罗斯联邦, St. Petersburg

A. Ivanov

A.M. Prokhorov General Physics Institute of the Russian Academy of Science

Email: alexanderalekseev@yandex.ru
俄罗斯联邦, Moscow

V. Klechkovskaya

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

Email: alexanderalekseev@yandex.ru
俄罗斯联邦, Moscow

M. Lukasov

Shubnikov Institute of Crystallography of Kurchatov Complex of Crystallography and Photonics of NRC “Kurchatov Institute”

Email: alexanderalekseev@yandex.ru
俄罗斯联邦, Moscow

参考

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2. Fig. 1. Compression isotherms of monolayers of molecules of symmetric diine N-aryl carbamates on the surface of the aqueous subphase: n3-3 (1) [14], n6-6 (2) and n9-9 (3).

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3. Fig. 2. Optical absorption spectra of monolayer LS films of diines n3-3 (a) and n6-6 (b) measured after UV irradiation of samples at different time intervals.

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4. Fig. 3. Changes in the intensity of the exciton absorption band of the PDA (a) and its displacement to the long-wavelength region of the spectrum (b) with an increase in the time of exposure to UV radiation on films of diines n3-3 (1) and n6-6 (2).

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5. Fig. 4. SEM images of a monolayer of n3-3 diine molecules (π = 28 mN/m) on the surface of a silicon substrate obtained before UV exposure to the film (a) and after 20 minutes of irradiation (b).

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6. Fig. 5. SEM images of a monolayer of n6-6 diine molecules (π = 19 mN/m) on the surface of a silicon substrate obtained before UV exposure to the film (a) and after 20 minutes of irradiation (b).

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7. Fig. 6. SEM images of a monolayer of n6-6 diine molecules (π = 35 mN/m) on the surface of a silicon substrate obtained before UV exposure to the film (a) and after 20 minutes of irradiation (b).

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