SURFACE ENERGY AND ACID-BASE CHARACTERISTICS OF BLENDS OF POLYETHYLENE, ETHYLENE-VINYL ACETATE COPOLYMER AND ETHYLENE-VINYL ALCOHOL COPOLYMER
Rubrics: 1. CHEMISTRY
Authors:
1.
OOO "Sibur"
2.
Kazan National Research Technological University
3.
OOO "Sibur PoliLab"
4.
Kazanskiy nacional'nyy issledovatel'skiy tehnologicheskiy universitet
5.
Kazan National Research Technological University
6.
Kazan National Research Technological University
Kazan, Russian Federation
Kazan, Russian Federation
7.
Kazan National Research Technological University
Kazan, Russian Federation
Kazan, Russian Federation
Type:
Article
Pages:
from 24
to 27
Status:
Published
Received:
23.12.2025
Accepted:
25.12.2025
Published:
25.12.2025
Language:
Russian
Keywords:
POLYETHYLENE, ETHYLENE COPOLYMER WITH VINYL ACETATE, ETHYLENE COPOLYMER WITH VINYL ALCOHOL, FREE SURFACE ENERGY, ACIDITY PARAMETER
Abstract (English):
The acid-base approach will allow for more efficient selection of polymer primers and adhesives for metals, and the selection of additives that enhance interfacial adhesion in polymer mixtures. Knowledge of the surface-energy characteristics and the acidity parameter of the material surface ensures more accurate selection of pairs with high interphase interaction. In polymer-polymer systems, interfacial acid-base interactions ensure adhesion between the polymers of the mixture, therefore, they affect the deformation and strength characteristics of the material. The ability to influence interphase interaction based on scientifically based approaches is of particular importance in the development of polymer composite materials based on thermodynamically incompatible polymers. To achieve this, information is needed on the surface energy characteristics of individual polymers and their mixtures in a wide range of concentrations. To obtain the necessary information, a large amount of experimental data is needed, including the values of the edge angles of wetting the surface of the studied systems with test fluids. This makes it possible to determine the values of free surface energy (FSE), its dispersion and polar components, as well as the acidity parameter of the studied surfaces. Of particular interest are mixtures based on polyethylene (PE) and ethylene vinyl acetate copolymer (EVA) with a copolymer of ethylene and vinyl alcohol (EVOH). This interest is due to the difficulties in the recycling of multilayer polymer films having a EVOH barrier layer. Knowledge of the parameters affecting the interfacial adhesion of the polymers of the mixture will make it possible to optimize the formulation of compositions of thermodynamically incompatible polymers and select the necessary compatibilizer. Studies have shown that despite minor changes in FSE and its components with an increase in the content of EVOH in mixtures, there is a sharp change in the surface acidity parameter for EVA-EVOH systems. For mixtures of polyethylene with EVOH, an interesting fact was found to change the surface polarity from neutral to electron-donating, and then, with an increase in the concentration of EVOH, to electron-acceptor. This is due to a change in the conformation of functional groups in the near-surface layers of the composition.
The acid-base approach will allow for more efficient selection of polymer primers and adhesives for metals, and the selection of additives that enhance interfacial adhesion in polymer mixtures. Knowledge of the surface-energy characteristics and the acidity parameter of the material surface ensures more accurate selection of pairs with high interphase interaction. In polymer-polymer systems, interfacial acid-base interactions ensure adhesion between the polymers of the mixture, therefore, they affect the deformation and strength characteristics of the material. The ability to influence interphase interaction based on scientifically based approaches is of particular importance in the development of polymer composite materials based on thermodynamically incompatible polymers. To achieve this, information is needed on the surface energy characteristics of individual polymers and their mixtures in a wide range of concentrations. To obtain the necessary information, a large amount of experimental data is needed, including the values of the edge angles of wetting the surface of the studied systems with test fluids. This makes it possible to determine the values of free surface energy (FSE), its dispersion and polar components, as well as the acidity parameter of the studied surfaces. Of particular interest are mixtures based on polyethylene (PE) and ethylene vinyl acetate copolymer (EVA) with a copolymer of ethylene and vinyl alcohol (EVOH). This interest is due to the difficulties in the recycling of multilayer polymer films having a EVOH barrier layer. Knowledge of the parameters affecting the interfacial adhesion of the polymers of the mixture will make it possible to optimize the formulation of compositions of thermodynamically incompatible polymers and select the necessary compatibilizer. Studies have shown that despite minor changes in FSE and its components with an increase in the content of EVOH in mixtures, there is a sharp change in the surface acidity parameter for EVA-EVOH systems. For mixtures of polyethylene with EVOH, an interesting fact was found to change the surface polarity from neutral to electron-donating, and then, with an increase in the concentration of EVOH, to electron-acceptor. This is due to a change in the conformation of functional groups in the near-surface layers of the composition.
Keywords:
POLYETHYLENE, ETHYLENE COPOLYMER WITH VINYL ACETATE, ETHYLENE COPOLYMER WITH VINYL ALCOHOL, FREE SURFACE ENERGY, ACIDITY PARAMETER
POLYETHYLENE, ETHYLENE COPOLYMER WITH VINYL ACETATE, ETHYLENE COPOLYMER WITH VINYL ALCOHOL, FREE SURFACE ENERGY, ACIDITY PARAMETER
