Features of Preparation of Multilayer Ultrathin Coatings from Thermosetting Epoxy Amine Systems by Spin-Coating Techniqu
- PDF / 954,396 Bytes
- 8 Pages / 612 x 792 pts (letter) Page_size
- 3 Downloads / 222 Views
ures of Preparation of Multilayer Ultrathin Coatings from Thermosetting Epoxy Amine Systems by Spin-Coating Technique I. N. Senchikhina, *, A. V. Zaitsevaa, V. A. Zakharovaa, T. V. Kharitonovaa, and E. S. Zhavoronokb aFrumkin
Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Moscow, 119071 Russia Russian Technological University MIREA, M. V. Lomonosov Institute of Fine Chemical Technologies, Moscow, 119454 Russia *e-mail: [email protected]
b
Received April 28, 2020; revised May 3, 2020; accepted May 6, 2020
Abstract—The basic factors influencing the quality of thin films prepared by the spin-coating technique from thermosetting stoichiometric epoxy-amine mixtures have been studied. It has been shown that films 2.5–3.0 nm thick are formed on silicon supports from a 0.025 wt % solution of the stoichiometric mixture of epoxy resin and amine in toluene. Multilayer polymer coatings with thickness up to 40 nm have been prepared from successively deposited partially cured epoxy-amine layers. The thickness of these coatings grows linearly with an increase in the number of layers, while their surface energy decreases. The revealed features may be used for creating multilayer polymer coatings, the properties of which vary along the coating thickness. DOI: 10.1134/S1061933X20050166
INTRODUCTION At present, one of the promising fields of research is the creation and study of two-dimensional systems, i.e., thin polymer films. The interest in these systems is due to not only fundamentally new properties, as compared with the bulk materials, but also wide possibilities of their application in the modern industry. Thin films may be used as membranes [1–4], sensors [5–8], and positive photo- and electron-beam resists [9, 10], as well as for producing optical waveguides [11] and items exhibiting nonlinear optical effects [12, 13]. An interesting approach to the targeted modification of the properties of such items is the creation of multilayer polymer composites formed from successively deposited thin polymer layers [14]. Numerous studies have been devoted to films based on thermoplastics, such as polyacrylates and polymethacrylates [9, 15], poly(vinyl alcohol) and its esters [9], polyorganosiloxanes [9], and other synthetic polymers. Of great interest are thin-layer structures formed from polypeptides and polysaccharides [9], with these structures simulating biological membranes. At the same time a new and very urgent line in the field of producing thin films is their formation from thermosetting systems, with such processes involving chemical transformations. This widens the possibilities for modifying the properties of the films and enhances their stability under operating conditions [16]. As an example, thin films based on polyimides,
acrylates, or epoxy systems may be attributed to such objects. In the first case, the formation of a thin film from a prepolymer is followed by imidization and polyimide formation [1, 9]; in the second case, the chemical process is realized via monomer polym
Data Loading...
