Radiation Durability of Polymeric Matrix Composites

Tenney, D. R.; Slemp, Wayne S.

doi:10.1021/bk-1989-0381.ch014

Cited by 9 publications

(10 citation statements)

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“…The general shape of the curve clearly indicates a complex radiolysis mechanism with competing crosslinking and chain‐scission reactions during the irradiation period. The trend supports earlier findings4–10 explaining the polymer degradation and changes in polymer morphology due to irradiation. The decrease in melt viscosity, after doses between 0.15 and 0.47 MGy, indicated a reduction of the molecular weight, which was attributed to the degradation of the tie‐molecules between the amorphous and crystalline phase 8.…”

Section: Resultssupporting

confidence: 92%

“…The amorphous phase was found to be more sensitive to radiation than the crystals 9. Tensile testing showed a decrease in elongation at break and the tensile strength of both amorphous and semicrystalline PEEK, whereas the tensile modulus increased for doses up to 50 MGy 5, 6. This effect was attributed to the crosslinking of molecules in the amorphous phase.…”

Section: Introductionmentioning

confidence: 96%

“…Yoda, in 1984, studied the effect of high‐energy electron beams on the structure and properties of PEEK 4. Other research followed,5–10 using also gamma9 and ion radiation 10. Although no significant differences in radiation damage were observed between high‐energy electron beam and gamma radiation,9 ion radiation yielded more damage, especially in the amorphous phase 10.…”

Section: Introductionmentioning

confidence: 99%

“…The energy deposition of gamma rays and electron energy in the irradiated material is more diffuse. Radiation damage was assessed with various means including differential scanning calorimetry (DSC),4, 10 X‐ray diffraction (XRD),7 gas evolution,9 dynamic mechanical relaxation,8 and tensile testing 5, 6, 10. In all cases, the damage was related to components of the morphology of PEEK consisting of crystals, the amorphous phase, and the tie‐molecules linking both phases.…”

Section: Introductionmentioning

confidence: 99%

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Mixed radiation field effects from a nuclear reactor on poly(aryl ether ether ketone): A melt viscosity study

Pagé

Bonin

Bui

et al. 2002

J of Applied Polymer Sci

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Poly(aryl ether ether ketone) (PEEK) is a high-temperature engineering thermoplastic used in the aerospace industry. To assess its suitability for nuclear industry applications, the effects of mixed field radiation from a nuclear reactor were investigated on two industrial semicrystalline PEEK grades (VICTREX 150P and 450P). Specimens were first processed on an ENGEL55 injection molder and then irradiated in the pool of a SLOWPOKE-2 nuclear research reactor. Specimens were thus exposed to a mixed field of radiation including gamma, electrons, protons, and neutrons, for exposures resulting in doses ranging from 0.15 to 15 MGy. Irradiated samples were characterized by viscosity measurements in the melt, differential scanning calorimetry (DSC), and density measurements. Melt viscosity of irradiated samples proved to be significant in detecting early molecular weight changes in PEEK and helped explain the interaction of competing chain scission and crosslinking reactions at various stages of the radiolysis. All results pointed toward the following transformation of the resin with increased dosage: chain scission of the tie-molecules between the amorphous and crystalline phases, crosslinking in the amorphous phase, followed by a general degradation of the molecular weight dominated by chain-scission.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mixed radiation field effects from a nuclear reactor on poly(aryl ether ether ketone): A melt viscosity study

Pagé

Bonin

Bui

et al. 2002

J of Applied Polymer Sci

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show abstract

“…The use of graphite fiber-reinforced, polymeric matrix composites for structural applications on weight critical space structures has increased because of high specific strength, stiffness, and low thermal expansion. But experimental studies (Tenney and Slemp, 1989) show that high doses of electron beam irradiation combined with thermal cycling can significantly change the mechanical and physical properties of graphite reinforced polymer matrix composite (Tenney and Slemp, 1989). When polymer matrix composites are used in superconducting magnets for fusion reactors, one of the more serious concerns is their resistance to changes in mechanical and electrical properties upon simultaneous irradiation with neutrons and g-ray during the fusion reactor operation.…”

Section: Introductionmentioning

confidence: 99%