Preparation and properties of propylene oxide fluorotelomers

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Аннотация

Telomeres are formed under the action of gamma rays from a 60Co source at room temperature in solutions of tetrafluoroethylene in propylene oxide with concentrations of 0.08–4.2 mol/L; telomer chain length depends on the monomer content in the solution. Monomer consumption during irradiation was controlled calorimetrically and gravimetrically; its complete conversion is observed at irradiation doses of 10–15 kGy. Molecular-mass characteristics of radiolysis products were determined by thermogravimetry. The telomeres with chain length less than 6 form true solutions. At the degree of monomer polymerization 6–15 colloidal solutions are formed, at more than 15 – dense gels. In the structure of propylene oxide fluorotelomer, the end functional epoxy group is retained. The morphology of the coating layers was investigated by atomic force microscopy.

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Авторлар туралы

I. Kim

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS

Хат алмасуға жауапты Автор.
Email: ipkim@icp.ac.ru
Ресей, Chernogolovka

A. Shestakov

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS

Email: ipkim@icp.ac.ru
Ресей, Chernogolovka

Yu. Shulga

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS

Email: ipkim@icp.ac.ru
Ресей, Chernogolovka

V. Gak

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS

Email: ipkim@icp.ac.ru
Ресей, Chernogolovka

S. Allayarov

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS

Email: ipkim@icp.ac.ru
Ресей, Chernogolovka

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Жүктеу
2. Fig. 1. MWD curves based on thermogravimetry data of TFE telomers in OP with the concentration of the initial solution (mol/l): 0.6 (1), 1.0 (2), 4.2 (3).

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Метадеректер
3. Fig. 2. AFM images of fluorotelomer OP-based coatings on the surface of a deformable aluminum alloy in amplitude representation – upper panel, relief representation – lower panel. Observation area 40 × 40 μm. Coating drying was carried out at 23°C (a), 100°C (b).

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4. Fig. 3. Structure of the transition state upon detachment of the H atom by the C2F5 radical from the primary (a), secondary (b) and tertiary (c) C–H bond of the OP (a–c), as well as its addition to the O atom (d, e). Distances are given in Å.

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5. Fig. 4. Structure of the transition state upon addition of a primary (a), secondary (b) and tertiary (c) radical from OP to TFE. Distances are given in Ǻ.

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Метадеректер
6. Fig. 5. Energy diagram of isomerization and the structure of the transition state upon addition of a secondary (a), tertiary (b) and primary (c) radical from OP. Distances are given in Å. Energy levels are given relative to the initial system C2F5● + OP.

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Метадеректер
7. Fig. 6. IR spectrum after supercritical drying of a telomer sample obtained by telomerization of TFE in OP with an initial solution concentration of 0.8 mol/l. The inset shows a fragment of the IR spectrum in the region of stretching vibrations of C=C and C=O bonds in the “absorption” mode in the region and its approximation by individual peaks.

Жүктеу (280KB)
Метадеректер
8. Fig. 7. Structure of a complex of two telomeres linked by hydrogen bonds at the terminal CF2H groups and the O atom of the OP fragment with a macroradical attached to the CH3 group (a) or the oxetane cycle (b).

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