Degradation and stabilization of polyurethane elastomers

Xie, Fengwei; Zhang, Tianlong; Bryant, Peter; Kurusingal, Valsala; Colwell, John M.; Laycock, Bronwyn

doi:10.1016/j.progpolymsci.2018.12.003

Cited by 453 publications

(333 citation statements)

References 595 publications

(1,076 reference statements)

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“…5, maximum rate of weight loss occurred around temperatures from 330 to 342 °C corresponds to urethane bonds decomposition, whereas from 422 to 437 °C is related to polyetherol degradation process. The third, visible only on the DTG curves and taking place at a temperature close to 505 °C is probably contingent on breaking C-C bonds [35,36]. The same can be seen on the curves shown in Fig.…”

Section: Thermal Properties Figures 4 and 5 Show Tg And Dtg Thermograsupporting

confidence: 63%

Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers

2019

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The man aim of this work was to investigate the effect of the molecular weight of polyols, mixture of prepolymers, and [NCO]/[OH] molar ratio used during the prepolymer chain extending step on the chemical structure, thermomechanical and mechanical properties, and thermal stability of thermoplastic poly(ether-urethane)s In this work thermoplastic poly(etherurethane)s were synthesized by using polyols with a various molecular weight, 4,4′-diphenylmethane diisocyanate and biobased glycol. Materials were obtained by a two-step method. The tests were carried out for polyurethanes obtained from a mixture of prepolymers and for reference samples. In the case of materials obtained with using mixture of prepolymers, the ratio of both prepolymers was determined on 50/50 weight percent. Soft segments of materials prepared with using mixture consist of two different polyols. The chemical structure was analyzed using FTIR spectroscopy. The Gaussian deconvolution technique was used to study the hydrogen bonding as well as to decompose carbonyl region of three peaks in various TPUs. The thermal degradation behavior was investigated by using thermogravimetric analysis at heating rates of 10 °C/ min. It was confirmed that the mixture of prepolymers has an effect of the degree of phase separation, thermal stability and selected properties of synthesized thermoplastic poly(ether-urethane)s.

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Section: Thermal Properties Figures 4 and 5 Show Tg And Dtg Thermograsupporting

confidence: 63%

Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers

2019

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“…As the literatures reported, the crystallization is usually induced by strain during tension process. Then, crystallization zones present harder inclusions, and act reinforcement roles on overall mechanical characteristics .…”

Section: Resultsmentioning

confidence: 99%

“…On the contrary, hydrogen bonding within hard segments enhances crystallization, and facilitates phase separation between soft and hard segment. Accordingly, hard segments are associated into hard domains acting as physical crosslinks and work also as inclusion particles of rubbery soft segments matrix …”

Section: Introductionmentioning

confidence: 99%

Strain hardening behaviors and mechanisms of polyurethane under various strain rate loading

Miao

2020

Polymer Engineering & Sci

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The uniaxial tension experiments are performed on thermoplastic polyurethane to investigate its mechanical behaviors and related potential mechanisms, and the loading strain rate is designing to be wide ranging from 0.0001 to 1 s −1 . It is found that the polyurethane presents an obvious rate-dependence, and the stress strain curves share distinct strain hardening characteristics under the investigated strain rates. Furthermore, the strain hardening ratios are sharing nearly same trends and appear to be influenced by both strain rate and the induced adiabatic heating. Besides, the ratio is also strain-dependent on previous loading history. Then, a two-dimension unit cell model is built to investigate potential equivalent mechanisms, of which the hard phase as inclusion is equivalent with crystallization zone, crosslinking sites, and so forth. The simulation results facilitate to explain the distinct strain hardening ratios, even for the matrix from the extrapolated curves under super-low strain rate loading. Finally, the analogic mechanisms of equivalent hard inclusions are proposed, which can reasonably explain the strain rate-and strain-dependence characteristics of polyurethane mechanical behaviors. K E Y W O R D Smechanical properties, polyurethane, strain hardening ratio, structure-property relations, tension

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“…The structure of the HS has more influence on thermal stability rather than SS structure. Interurethane hydrogen bonding plays a significant role in the thermal stability of segmented PUs, which can be enhanced by a higher degree of phase separation between SS and HS [18]. The higher the concentration of the urethane group, the lower are both the activation energy for thermal decomposition and the thermal stability of the PU [19].…”

Section: Effect Of Structure On Pu Thermal Resistancementioning

confidence: 99%

Thermal Resistance Properties of Polyurethanes and Its Composites

Amado¹

2020

Thermosoftening Plastics

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The nature of starting materials and the condition of polyurethane (PU) preparation are regarded as the main general parameters that determine PU thermal resistance. The effect of structure and presence of additives were identified as the major general factors on this regard. Structural factors include phase microstructure, i.e., chemical structure, proportion, and segregation of soft and hard segments, polyol type (petrochemical or natural oil-based), isocyanate and chain extender type, and thermoplasticity of PU. In respect to the effect of additives, the incorporation of fillers is the most direct strategy to increase PU heat resistance. With respect to fiber additives, in general a positive effect is found on improving thermal resistance, although this generalization could not apply, considering the large number of different PU and environmental conditions of usage.

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Degradation and stabilization of polyurethane elastomers

Abstract: Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 453 publications

References 595 publications

Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers

Investigation of Thermoplastic Polyurethanes Synthesized via Two Different Prepolymers

Strain hardening behaviors and mechanisms of polyurethane under various strain rate loading

Thermal Resistance Properties of Polyurethanes and Its Composites

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