Influence of e-beam irradiation on the dynamic creep and fatigue properties of poly(aliphatic/aromatic-ester) copolymers for biomedical applications

Götz, Christian; Handge, Ulrich A.; Piątek, M.; Fray, Mirosława El; Altstädt, Volker

doi:10.1016/j.polymer.2009.09.051

Cited by 14 publications

(19 citation statements)

References 24 publications

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“…For example, chemically crosslinked silicone elastomers were very resistant to creep, but they had the largest elastic deformation at lower loads. This showed that its chemical crosslinked structure had fairly poor stability under transient load …”

Section: Resultsmentioning

confidence: 99%

“…The fatigue behavior and failure characteristics of thermoplastic elastomer (TPE) during application and service are very important basic properties of the material, especially their dynamic fatigue performance under the application scenario of cyclic loading in a specific service environment. − The low crystallinity or relatively low content of the HS renders the PEBAs low Young’s modulus, which makes the PEBAs prone to creep in service environments with periodic fatigue. ,, Under such a service scenario, the viscoelastic characteristics of PEBA have time-dependent characteristics, such as modulus, loss in mechanical properties, and creep. However, the viscoelastic behaviors during fatigue tests of PEBAs have not been reported yet, while those of other segmented copolymer elastomers, i.e., thermoplastic polyurethane (TPU) and poly(ester-ether) (PEE), have been studied. − …”

Section: Introductionmentioning

confidence: 99%

“…For dynamic creep testing, researchers can employ the incremental load test to determine the effect of stress changes on the dimensional stability and modulus of the sample. In summary, these dynamic fatigue tests are powerful tools to study the relationship between the structure and performance of polymer materials. − They can help both scientists and engineers understand the influence of polymer chain structure parameters on the fatigue characteristics of samples as well as understand the limits of various properties of PEBAs under actual service conditions in order to better use TPEs to design high-performance products.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fatigue Characteristics of Poly(ether-b-amide) Elastomers during Cyclic Dynamic Tests and the Underlying Microstructural Evolution

Zhu

Brückner

Neumeyer

et al. 2022

Ind. Eng. Chem. Res.

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The dynamic fatigue behavior of the poly(ether-b-amide) (PEBA) elastomers was characterized by a combination of step increase load test (SILT), step increase strain test (SIST), and single load dynamic creep (SLDC). PEBA had crystalline hard segments of polyamide 12 (PA12) and soft segments of poly(tetramethylene oxide) (PTMO). The crystalline morphologies before and after the tests were studied by ex situ wide-angle X-ray diffraction (WAXD) and small-angle X-ray scattering (SAXS). Fast stress relaxation can be seen under the applied strain well below than the elongation at break. Remarkable dynamic creep can be observed under the applied load triggering yielding of the specimen, which is substantially less than the ultimate tensile strength. Although the presence of high content of amorphous PTMO renders high entropic elasticity, the disintegration of the crystalline hard domains of PA12 is expected to determine the relaxation rate, creep rate, and modulus, as strain-induced crystallization in soft domains did not occur and no trace was found by WAXD. SAXS patterns showed that the orientation of the PA12 lamellae at lower stresses or strains can largely be restored. However, the fractured and highly aligned PA12 lamellae resulted in classic four-point or two-lobe SAXS patterns, which implied the underlying microstructural changes after the cyclic dynamic tests.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fatigue Characteristics of Poly(ether-b-amide) Elastomers during Cyclic Dynamic Tests and the Underlying Microstructural Evolution

Zhu

Brückner

Neumeyer

et al. 2022

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

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“…El Fray et al reported that medical grade thermoplastic PU materials indicate large creep during long‐term fatigue tests 30–32. These results demonstrated that PUs are not well suited for devices that demand high biodurability in a highly flexing biomechanical environment.…”

Section: Methodsmentioning

confidence: 99%

Polish artificial heart program

Fray

Czugala

2011

WIREs Nanomed Nanobiotechnol

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Despite significant advances in the development of artificial heart substitutes, anthrombogenic materials and surfaces remain to be the main challenge for implants, which can prevent thrombosis that leads to rejection. The goal of material engineering is essentially to design polymeric materials of high durability and optimal thrombogenicity in mechanical heart prosthesis, being developed recently in a frame of the polish artificial heart program. For these reasons, various surface modifications are being continuously developed for a 'gold standard' material, which is a polyurethane (PU) thermoplastic elastomer and they will be shortly reviewed. However, new polymeric materials can meet medical word's attention if they are able to provide similar or better characteristics in term of bulk and surface properties. Specifically, if they will show appropriate surface topography, which is the most influential in determining the response of live tissues toward biomaterials. Nanostructured polyester thermoplastic elastomers of high biodurability as an alternative to PU materials for artificial heart are challenging new materials, and they will be discussed briefly.

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“…1 Even though, efficient control of stem cell growth is still far away from satisfaction. [8][9][10][11] The proposed method possesses a number of advantages. Based on this concept, we propose an efficient method of modifying substrate stiffness while maintaining the surface condition unchanged by focused electron beam irradiation in hydrogen silsesquioxane ͑HSQ͒.…”

Section: Introductionmentioning

confidence: 99%

Surface stiffness modification by e-beam irradiation for stem cell growth control

Lanniel

Alexandar

et al. 2011

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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Properties and structure of vapor-deposited polyimide upon electron-beam irradiation J. Appl. Phys. 99, 064910 (2006); 10.1063/1.2186030Effects of electron-beam exposure on a ruthenium nanocluster polymer This article reports a novel method to effectively modify the surface stiffness for the differentiation of stem cell growth. To achieve large range of surface hardness, focused electron beam is first employed to radiate hydrogen silsesquioxane ͑HSQ͒ film. With different degrees of curing caused by certain e-beam exposure, the HSQ demonstrates various Young's modulus from 0.5 to 2 GPa, measured by an atomic force microscope. Fourier transform infrared spectra were used to investigate the origin of the stiffness change, which is due to the e-beam irradiation induced network formation inside HSQ. The novel technique possesses a number of advantages such as precision control of stiffness in a broad matrix with high spatial resolution. It also offers a good opportunity to define the geometry shape with a constant stiffness in nanometer scale.

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Influence of e-beam irradiation on the dynamic creep and fatigue properties of poly(aliphatic/aromatic-ester) copolymers for biomedical applications

Cited by 14 publications

References 24 publications

Fatigue Characteristics of Poly(ether-b-amide) Elastomers during Cyclic Dynamic Tests and the Underlying Microstructural Evolution

Fatigue Characteristics of Poly(ether-b-amide) Elastomers during Cyclic Dynamic Tests and the Underlying Microstructural Evolution

Polish artificial heart program

Surface stiffness modification by e-beam irradiation for stem cell growth control

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