PHYSICAL-MECHANICAL AND THERMOMECHANICAL PROPERTIES OF MODIFIED SEGMENTED POLYURETHANES
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
Kazan National Research Technological University
2.
Kazan National Research Technological University
3.
Kazan National Research Technological University
4.
Kazanskiy nacional'nyy issledovatel'skiy tehnologicheskiy universitet
5.
Kazan State Energy University
6.
KNITU
Type:
Article
Pages:
from 106
to 111
Status:
Published
Received:
18.12.2025
Accepted:
28.01.2026
Published:
05.04.2026
Language:
Russian
Keywords:
SEGMENTED POLYURETHANES, METAL-COMPLEX MODIFICATION, PHYSICO-MECHANICAL PROPERTIES, THERMOMECHANICAL BEHAVIOR
Funding:
Rabota vypolnena pri finansovoy podderzhke RNF grant № 25-23-00003.
Abstract:
A promising method for modifying polyurethanes involves the use of metal complexes, which enhance interchain interactions and influence the supramolecular structure and strength properties of the material. This paper presents the results of a study examining the influence of a metal complex system obtained using N,N'-diethylhydroxylamine and copper(II) chloride (CuCl₂-DEHA) on the physicomechanical and structural properties of segmented polyurethanes (SPUs) synthesized from polyoxytetramethylene glycol, 4,4'-methylene diphenyl diisocyanate, and 1,4-butanediol. SPUs with a low content of rigid blocks were synthesized to evaluate the structural changes. Mechanical test results showed that even a small addition of CuCl₂ to the CuCl₂-DEHA system (0.03-0.1 wt.%) leads to a nearly twofold increase in tensile strength of the SPU from 15 to 30 MPa, as well as a significant increase in elongation at break from 400 to 1000%. This effect is due to the formation of additional coordination bonds between copper ions and urethane groups, which enhances intermolecular interactions and promotes denser packing of macromolecules. With an increase in the CuCl₂ content above 0.5 wt.%, a gradual decrease in strength properties and a decrease in elongation at break are observed. A study of the thermomechanical behavior showed that the yield point of the original samples is approximately 130 °C, while for the modified systems (0.03-0.4 wt.% CuCl₂), this figure increases to 150-170 °C. The increase in heat resistance is explained by the increased number of coordination interactions that prevent thermal disordering of the rigid segments. At concentrations above 0.7 wt.%, the flow temperature decreases to 140 °C, which indicates the existence of an optimal content of the metal complex in the SPU composition. This improves the characteristics of segmented polyurethanes without critically degrading their thermal stability. The obtained results demonstrate that modifying SPU with the CuCl₂-DEHA system is an effective tool for targeted control of the properties of polyurethane materials, opening up prospects for their application in adhesive coatings and engineering structural materials.
A promising method for modifying polyurethanes involves the use of metal complexes, which enhance interchain interactions and influence the supramolecular structure and strength properties of the material. This paper presents the results of a study examining the influence of a metal complex system obtained using N,N'-diethylhydroxylamine and copper(II) chloride (CuCl₂-DEHA) on the physicomechanical and structural properties of segmented polyurethanes (SPUs) synthesized from polyoxytetramethylene glycol, 4,4'-methylene diphenyl diisocyanate, and 1,4-butanediol. SPUs with a low content of rigid blocks were synthesized to evaluate the structural changes. Mechanical test results showed that even a small addition of CuCl₂ to the CuCl₂-DEHA system (0.03-0.1 wt.%) leads to a nearly twofold increase in tensile strength of the SPU from 15 to 30 MPa, as well as a significant increase in elongation at break from 400 to 1000%. This effect is due to the formation of additional coordination bonds between copper ions and urethane groups, which enhances intermolecular interactions and promotes denser packing of macromolecules. With an increase in the CuCl₂ content above 0.5 wt.%, a gradual decrease in strength properties and a decrease in elongation at break are observed. A study of the thermomechanical behavior showed that the yield point of the original samples is approximately 130 °C, while for the modified systems (0.03-0.4 wt.% CuCl₂), this figure increases to 150-170 °C. The increase in heat resistance is explained by the increased number of coordination interactions that prevent thermal disordering of the rigid segments. At concentrations above 0.7 wt.%, the flow temperature decreases to 140 °C, which indicates the existence of an optimal content of the metal complex in the SPU composition. This improves the characteristics of segmented polyurethanes without critically degrading their thermal stability. The obtained results demonstrate that modifying SPU with the CuCl₂-DEHA system is an effective tool for targeted control of the properties of polyurethane materials, opening up prospects for their application in adhesive coatings and engineering structural materials.
Keywords:
SEGMENTED POLYURETHANES, METAL-COMPLEX MODIFICATION, PHYSICO-MECHANICAL PROPERTIES, THERMOMECHANICAL BEHAVIOR
SEGMENTED POLYURETHANES, METAL-COMPLEX MODIFICATION, PHYSICO-MECHANICAL PROPERTIES, THERMOMECHANICAL BEHAVIOR
