2021 (1) 2

https://doi.org/10.15407/polymerj.43.01.012

DAMPING EFFICIENCY OF TWO-LAYER POLYURETHANE COMPOSITES

N.V. BABKINA,

Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske shose, Kyiv, 02160, Ukraine

e-mail: nabab1906@gmail.com

ORCID: 0000-0002-1803-0887

O.I. ANTONENKO,

Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske shose, Kyiv, 02160, Ukraine

e-mail: antoks2870@gmail.com

ОRCID: 0000-0002-6451-7499

L.F. KOSYANCHUK,

Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske shose, Kyiv, 02160, Ukraine

e-mail: lkosyanchuk@ukr.net

ОRCID: 0000-0002-3617-9538

O.O. BROVKO,

Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske shose, Kyiv, 02160, Ukraine

e-mail: brovko@nas.gov.ua

ОRCID: 0000-0003-0238-1137

Polym. J., 2021, 43, no. 1: 12-18.

Section: Structure and properties.

Language: Ukrainian.

Abstract:

In this work, based on the results of dynamic mechanical studies, the damping efficiency of two-layer polyurethane (PU) composites designed by gluing two films of synthesized PU with different glass transition temperatures (T_g) was estimated. The damping efficiency was estimated by the parameters of the mechanical losses (tanδ) peak. To vary T_g, three types of PU with different chemical nature and structure were synthesized. The effect of an increase in the difference between the T_g of the initial PU (ΔT_g) on the damping efficiency of the two-layer PU composites formed from them is analyzed. The effective damping temperature range (ΔT) was estimated as the temperature range under conditions tanδ ≥ 0,3 and tanδ ≥ 0,6. It was shown that at ΔТ_g = 7 °С a two-layer PU composite has one relaxation maximum, and its temperature range of damping efficiency expands in comparison with ΔТ for individual PU. Under the conditions ΔТ_g = 23 °С and ΔТ_g = 30 °С, two-layer PU composites exhibit damping efficiency in two temperature regions at tanδ ≥ 0,3, which provides an additional temperature range of effective damping. The essential role of the PU structure of each of the layers in the formation of a two-layer composite by gluing has been determined. Easier penetration of residues of the adhesive organic solvent into the surface of the PU film with a linear structure leads to plasticization of the corresponding layer in the composite and reduces T_g. It is shown that a two-layer structure can be used to solve specific problems related to the adjustment or broadening the effective damping temperature range.

Keywords: damping efficiency, polyurethane, two-layer polyurethane composites effective damping temperature range; dynamic mechanical analysis.

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Received 27.01.2021