Structure–properties relationship of the polyurethanes that contain Schiff base in the main chain

Oprea, Stefan; Potolinca, Violeta Otilia; Oprea, Veronica; Diaconu, Livia Ingrid

doi:10.1177/0954008319901152

Cited by 4 publications

(4 citation statements)

References 32 publications

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“…Therefore, damping materials are widely used in various fields, such as naval ships, aerospace, transportation, bridges and precision instruments. [1][2][3] The damping properties of materials are generally evaluated by the damping factor (tan δ) and the effective damping (tan δ ≥ 0.3) temperature range of the material. The materials show better damping properties in the glass transition temperature range.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and molecular dynamics study of high-damping polyurethane elastomers based on the synergistic effect of dangling chains and dynamic bonds

Rong

Jia

et al. 2022

Polym. Chem.

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Section: Introductionmentioning

confidence: 99%

Synthesis and molecular dynamics study of high-damping polyurethane elastomers based on the synergistic effect of dangling chains and dynamic bonds

Rong

Jia

et al. 2022

Polym. Chem.

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“…In order to determine the reliable structure–property relationships for PUs and a variety of different approaches, such as UV-vis spectrum, 16 NMR spectroscopy, 17 the equilibrium swell, 18,19 and dynamic mechanical analysis (DMA), 20–22 are used. In general, the most common quantitative approaches of the crosslink density are the equilibrium swell and DMA technique.…”

Section: Introductionmentioning

confidence: 99%

Crosslink density and mechanical property evolution during the curing of polyurethane-urea/sodium silicate hybrid composites

Sun

Liang

et al. 2021

High Performance Polymers

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In order to understand the evolution of the structure–property relationship between the crosslink density and mechanical properties of polyurethane-urea/sodium silicate (PU/SS) hybrid composites, a series of PU/SS composites with 2.5 wt% organofunctional silanes and pure PU/SS composites are investigated at different curing time. Mechanical properties, the fracture surface morphology, and thermo-mechanical properties of these PU/SS composites are characterized by electron omnipotence experiment machine, scanning electron microscope, and dynamic mechanical analysis (DMA), respectively. The mechanical test results show the strength and fracture toughness of the PU/SS composites first increase and then stabilize during cure, and the modification leads to PU/SS composites with significantly higher mechanical properties. Further, the morphology of fractured samples also reveals that the longer curing time and the modification of the PU/SS composites means a higher curing degree. Moreover, the increase in the crosslink density calculated from the DMA tests quantitatively confirmed the positive influence of the curing time and the modification in enhancing mechanical properties. In addition, it is also found that the mechanical properties of the PU/SS composites not only depend on the crosslink density but also on the well-dispersed hybrid PU/SS system.

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“…Therefore, it is necessary to obtain polyurethane structures that provide increased stability in outdoor applications or special conditions. 7,8…”

Section: Introductionmentioning

confidence: 99%

The effects of the inclusion of 1,2,4-triazole derivatives into the main chains of the polyurethane urea exposed to UV radiation

Oprea¹,

Potolinca²

2021

High Performance Polymers

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Linear polyurethane urea containing 1,2,4-triazole segments was obtained by polyaddition of the 3,5-diamino-1,2,4-triazole (DATA) to urethane prepolymer. Also, three crosslinked polymers with different crosslinkers (2,4,6-triaminopyrimidine (TAP), glycerin (Gly), castor oil (CO)) were synthesized. Thermogravimetric analysis, of the obtained polymers, indicated good thermal stability up to 310°C. The polyurethane urea chemical structure was confirmed by FTIR analysis. The glass transition temperatures (Tg) of these polymers, measured by differential scanning calorimetry (DSC), were found in the range of −52°C to −56°C. These values were not significantly influenced by the structure of the hard domain and the intermolecular interactions. The tensile testing showed that the inclusion of 1,2,4-triazole in polyurethane structure substantially improves the tensile strength up to 58 MPa. The obtained polyurethane urea presents surface slight hydrophobic and low interfacial tension. The positive effect of the 1,2,4-triazole segment from the polymer main chain in the UV aging process of these polymer materials has been studied. After exposure to UV radiation, few changes were observed in the molecular structure, in the surface morphology and the mechanical properties.

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Structure–properties relationship of the polyurethanes that contain Schiff base in the main chain

Cited by 4 publications

References 32 publications

Synthesis and molecular dynamics study of high-damping polyurethane elastomers based on the synergistic effect of dangling chains and dynamic bonds

Synthesis and molecular dynamics study of high-damping polyurethane elastomers based on the synergistic effect of dangling chains and dynamic bonds

Crosslink density and mechanical property evolution during the curing of polyurethane-urea/sodium silicate hybrid composites

The effects of the inclusion of 1,2,4-triazole derivatives into the main chains of the polyurethane urea exposed to UV radiation

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