Molecular insights into hydrogen bonds in polyurethane/hindered phenol hybrids: evolution and relationship with damping properties

Xu, Kui; Zhang, Fengshun; Zhang, Xianlong; Hu, Qiaoman; Wu, Hong; Guo, Shaoyun

doi:10.1039/c4ta00476k

Cited by 63 publications

(58 citation statements)

References 39 publications

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“…This is possible because tan d shows a pronounced maximum at the T g of the polymer. [41][42][43] In those experiments (stated as temperature sweeps), G 0 and G 00 are measured over temperature at low constant shearing frequencies, i.e. in the linear viscoelastic regime.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen bonding and thermoplastic elastomers – a nice couple with temperature-adjustable mechanical properties

et al. 2018

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ab Styrene-butadiene copolymers are modified with varying fractions of benzoic acid moieties being able to perform hydrogen bonding. This is done by using a simple synthetic approach which utilizes click chemistry. Temperature-dependent dynamic mechanical properties are studied, and it turns out that even the apparently rather simple hydrogen bonding motif has a marked impact on the material properties due to the fact that it facilitates the formation of a supramolecular polymer network. Besides a glass transition, the investigated functionalized copolymers exhibit a second endothermic transition, known as a quasi-melting. This is related to the opening of the hydrogen bonding complexes.Additionally to dynamic mechanical analysis (DMA), differential scanning calorimetry (DSC), temperaturedependent infrared (IR) spectroscopy and small angle X-ray scattering (SAXS) are used to understand the structure-property relationships.

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Section: Introductionmentioning

confidence: 99%

Hydrogen bonding and thermoplastic elastomers – a nice couple with temperature-adjustable mechanical properties

et al. 2018

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“…This result can also explain the presence of abundant NH···-O-hydrogen bonding in HQEE-L-based polyurethanes. The effect of hydrogen bonding on damping properties has also been noticed in in polyurethane/ hindered phenol hybrids system [38]. Meanwhile, the tan δ peak values in PBA series TPUs are overall higher than that in PTMO series TPUs which may derived from the stronger intermolecular interactions between hard segments and soft segments caused by the large amount of C=O group in PBA soft segment, coordinated with the larger amount of bonded NH···C=O observed in PBA series TPUs.…”

Section: Atr-ftir Analysismentioning

confidence: 88%

Synthesis and properties of segmented polyurethanes with hydroquinone ether derivatives as chain extender

Liu

Wang

et al. 2015

J Polym Res

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Two series of 4, 4′-diphenylmethane diisocyanate (MDI) type polyurethanes based on poly(tetramethyleneoxide) glycol (PTMO) and polybutylene adipate glycol (PBA) as soft segments were synthesized by one-step bulk polymerization process. Various hard segments were obtained from hydroquinone ether derivatives with or without ether oxygen structure bonded with the aromatic units in main chain, including hydroquinone (HQE), hydroquinone bis(b-hydroxyethy) ether (HQEE), and 4-hydroxyethyl ethyl oxygen-1-hydroxy ethyl benzene ether (HQEE-L) as chain extenders. The effect of chain extender structure on aggregation structure, thermal and mechanical properties was studied. ATR-FTIR suggested that hydrogen bonding interactions were significantly changed in the presence of flexible ether oxygen structure in hard segment. HQEE-based polyurethanes and HQEE-L-based polyurethanes displayed microphase separation and microphase mixing behavior respectively based on DMA and DSC results. XRD curves confirmed that flexible ether oxygen chain bonded with the rigid aromatic units played a balancing role in the steric effect caused by aromatic chain extender. Thermal properties of polyurethanes were affected mainly by the hard segment packing while mechanical properties were influenced by both phase separation and phase mixing which possess strong hydrogen bonding interactions. The excellent elongation in PTMO/HQEE-L and the high ultimate tensile strength in PBA/HQEE-L can be attributed to the phase mixing with strong hydrogen bonding interactions presented in HQEE-Lbased polyurethanes.

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“…During dynamic processes, the destruction and re‐construction of the intermolecular HBs bring additional external energy dissipation. Thus, the damping factor (tan δ) and the effective loss peak area (TA, i.e., the area under the tan δ versus temperature curve where tan δ ≥ 0.3) of the hybrids are significantly improved . Because of the importance of the intermolecular HBs, numerous experimental methods, such as infrared spectroscopy , temperature‐dependent infrared spectroscopy , two‐dimensional infrared spectroscopy , and nuclear magnetic resonance , are adopted to verify the existence of the HBs in detail.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the damping factor (tan δ) and the effective loss peak area (TA, i.e., the area under the tan δ versus temperature curve where tan δ ≥ 0.3) of the hybrids are significantly improved . Because of the importance of the intermolecular HBs, numerous experimental methods, such as infrared spectroscopy , temperature‐dependent infrared spectroscopy , two‐dimensional infrared spectroscopy , and nuclear magnetic resonance , are adopted to verify the existence of the HBs in detail. Moreover, to further reveal the hydrogen‐bonding damping mechanism, molecular dynamics (MD) simulation is adopted to study the HBs between common HPs and polar polymers at the atomic or molecular level .…”

Section: Introductionmentioning

confidence: 99%

“…Because of the importance of the intermolecular HBs, numerous experimental methods, such as infrared spectroscopy , temperature‐dependent infrared spectroscopy , two‐dimensional infrared spectroscopy , and nuclear magnetic resonance , are adopted to verify the existence of the HBs in detail. Moreover, to further reveal the hydrogen‐bonding damping mechanism, molecular dynamics (MD) simulation is adopted to study the HBs between common HPs and polar polymers at the atomic or molecular level . The simulation results show that the number of intermolecular HBs, the value of binding energy, and fractional free volume (FFV) determine the damping properties of the hybrids.…”

Section: Introductionmentioning

confidence: 99%

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Molecular Insights Into Chain Length Effects of Hindered Phenol on the Molecular Interactions and Damping Properties of Polymer‐Based Hybrid Materials

Zhou

et al. 2019

Polymer Engineering & Sci

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For hindered phenol (HP)/polymer‐based hybrid damping materials, the unclear relationship between the structure of HP and the damping properties limits the application of such promising materials. Herein, three kinds of HPs with different chain lengths were synthesized to explore the mechanism. The structures of the HPs were confirmed by nuclear magnetic resonance spectrum, the Fourier Transform Infrared Spectroscopy (FT‐IR), and X‐ray Diffraction (XRD). For further prepared HP/polyurethane hybrids, FT‐IR and XRD were adopted to confirm the hydrogen bonding interactions and micromorphologies. Moreover, molecular dynamics simulation was used to characterize the effects of chain length variation on the inter‐ and intramolecular hydrogen bonds (HBs) and the chain packing of the hybrids in a quantitative manner. Subsequently, combined with the dynamic mechanical analysis, the relationship between the chain length variation and the damping properties was established. The results showed that with the increasing of chain length, the intramolecular HBs between HPs can be prevented, and the loose HP chain within tight polymer matrix can be achieved, which results in a maximum increase of loss factor. While the homogeneity of the chain packing increases with the chain length increasing, which results in a decrease of the temperature range of loss factor ≥ 0.3. POLYM. ENG. SCI., 60:446–454, 2020. © 2019 Society of Plastics Engineers

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Molecular insights into hydrogen bonds in polyurethane/hindered phenol hybrids: evolution and relationship with damping properties

Abstract: By combining experiments and MD simulation, the relationship between hydrogen bond evolution and damping property variation of TPU was revealed.

Cited by 63 publications

References 39 publications

Hydrogen bonding and thermoplastic elastomers – a nice couple with temperature-adjustable mechanical properties

Hydrogen bonding and thermoplastic elastomers – a nice couple with temperature-adjustable mechanical properties

Synthesis and properties of segmented polyurethanes with hydroquinone ether derivatives as chain extender

Molecular Insights Into Chain Length Effects of Hindered Phenol on the Molecular Interactions and Damping Properties of Polymer‐Based Hybrid Materials

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