Effect of the hydrogen bonding on the inelasticity of thermoplastic polyurethane elastomers

Prisăcariu, Cristina; Scortanu, Elena; Agapie, Bogdan

doi:10.1016/j.jiec.2012.07.012

Cited by 21 publications

(5 citation statements)

References 16 publications

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“…This large residual deformation is consistent with literature data on TPU [3], [4] and can be attributed to the absence of chemical crosslinks as well as to the plastic deformation of the hard domains following the application of large strains. Interestingly, we found that for the same value of maximum applied stretch , all TPUs present a similar fraction of residual Table 1 Young modulus for all TPU at 23 and 60°C TPU_XTAL, TPU_HARD and TPU_SOFT respectively.…”

Section: Uniaxial Tensile Testsupporting

confidence: 91%

Strain induced strengthening of soft thermoplastic polyurethanes under cyclic deformation

Scetta

Selles³

et al. 2021

Journal of Polymer Science

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We investigate the cyclic mechanical behavior in uniaxial tension of three different commercial thermoplastic polyurethane elastomers (TPU) often considered as a sustainable replacement for common filled elastomers. All TPU have similar hard segment contents and linear moduli but sensibly different large strain properties as shown by X‐ray analysis. Despite these differences, we found a stiffening effect after conditioning in step cyclic loading which greatly differs from the common softening (also referred as Mullins effect) observed in chemically crosslinked filled rubbers. We propose that this self‐reinforcement is related to the fragmentation of hard domains, naturally present in TPU, in smaller but more numerous sub‐units that may act as new physical crosslinking points. The proposed stiffening mechanism is not dissimilar to the strain‐induced crystallization observed in stretched natural rubber, but it presents a persistent nature. In particular, it may cause a local reinforcement where an inhomogeneous strain field is present, as is the case of a crack propagating in cyclic fatigue, providing a potential explanation for the well‐known toughness and wear resistance of TPU.

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Section: Uniaxial Tensile Testsupporting

confidence: 91%

Strain induced strengthening of soft thermoplastic polyurethanes under cyclic deformation

Scetta

Selles³

et al. 2021

Journal of Polymer Science

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“…Hard phase properties in turn depend on molecular packing governed by crystallinity and H-bonding density. 5,6 Elastomeric properties are reported for a high soft block content, typically between 60 and 85% w . 7,8 As a result, the hard block/soft block ratio as well as the size of the respective blocks are also a major parameter governing properties.…”

Section: Introductionmentioning

confidence: 99%

Relationships between molar mass and fracture properties of segmented urethane and amide copolymers modified by chemical degradation

Bardin

Gac

Bindi

et al. 2020

Journal of Polymer Science

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Section: Resultsmentioning

confidence: 99%

“…In addition, lots of polar groups were distributed on the surface of G2 PAMAM-H molecules. A large number of hydrogen bonds can be generated with the rubber molecular chains in the system [31][32][33].Suckowet al [34]used carbonyl and imine groups to form hydrogen bonds in rubber systems, which also enhanced the mechanical properties of nanocomposites. These sacrificial hydrogen bonds possessed energy dissipation capabilities when they were stretched.…”

Section: 3tensile Properties Of Ciir/g2 Pamam-h Nanocompositesmentioning

confidence: 99%

Diphenolic acid-modified PAMAM/chlorinated butyl rubber nanocomposites with superior mechanical, damping, and self-healing properties

Wang

et al. 2021

Science and Technology of Advanced Materials

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Based on its excellent damping properties, traditional rubber has been widely used in various industries, including aerospace, rail transit and automotive. However, the disadvantages of effective damping area, unstable damping performance, easy fatigue, and aging, greatly limited the further application of rubber materials. Thus, it is important to develop novel modified rubber damping materials. Herein, polyamidoamine dendrimers with terminal-modified phenolic hydroxyl and amine groups (G2 PAMAM-H) were designed and used as modifiers to improve the damping performance of chlorinated butyl rubber (CIIR). The results showed that the modification of G2 PAMAM by diphenolic acid can avoid its aggregation in the CIIR matrix. CIIR/G2 PAMAM-H nanocomposites exhibited high tan δ max of 1.52 and wide damping temperature region of 140°C (tan δ > 0.55)at a very low loading (4.32 wt.%), which were strongerthan that of pure CIIR and CIIR/G2 PAMAM nanocomposites. In addition, these nanocomposites also exhibited a unique self-healing ability by multiple hydrogen bonds, which can effectively extend the life of the rubber material in actual production. Therefore, the dendrimer modification provided unique development opportunities for elastomers in certain highly engineered fields, such as vehicles, rail transit, aerospace, etc.

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Effect of the hydrogen bonding on the inelasticity of thermoplastic polyurethane elastomers

Cited by 21 publications

References 16 publications

Strain induced strengthening of soft thermoplastic polyurethanes under cyclic deformation

Strain induced strengthening of soft thermoplastic polyurethanes under cyclic deformation

Relationships between molar mass and fracture properties of segmented urethane and amide copolymers modified by chemical degradation

Diphenolic acid-modified PAMAM/chlorinated butyl rubber nanocomposites with superior mechanical, damping, and self-healing properties

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