Temperature Dependence of Sound Velocity in High-Strength Fiber-Reinforced Plastics

Nomura, R.; Yoneyama, K.; Ogasawara, F.; Ueno, Masashi; Okuda, Y.; Yamanaka, Akihiro

doi:10.1143/jjap.42.5205

Cited by 11 publications

(8 citation statements)

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“…The sound velocity of the crystal in DF (v) is estimated as 15,300 m/s by substitution of the numerical values of Ec and ρ into eq 9. In the case of DF(C), the sound velocity of DF(C) reinforced plastics was measured, and it almost agrees to that estimated tensile modulus 48, 49…”

Section: Resultssupporting

confidence: 77%

“…In the case of DF(C), the sound velocity of DF(C) reinforced plastics was measured, and it almost agrees to that estimated tensile modulus. 48,49 The mean free path l of phonon of the continuous crystal region of DF in the fiber direction is estimated by the substitution of thermal diffu- sivity k shown in Figure 10 and sound velocity v ¼ 15,300 m/s into eq 8. Temperature dependence of the mean free path of phonon (l) in the continuous crystal region is shown in Figure 11.…”

Section: ¼ ðEc=qþ 1=2 ð9þmentioning

confidence: 99%

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Thermal conductivity of high strength polyethylene fiber in low temperature

Yamanaka

Fujishiro

Kashima

et al. 2005

J Polym Sci B Polym Phys

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High strength polyethylene fiber (Toyobo, Dyneema 1 fiber, hereinafter abbreviated to DF) used as reinforcement of fiber-reinforced plastics for cryogenic use has a high thermal conductivity. To understand the thermal conductivity of DF, the relation between fiber structure and thermal conductivity of several kinds of polyethylene fibers having different modulus from 15 to 134 GPa (hereinafter abbreviated to DFs) was investigated. The mechanical series-parallel model composed of crystal and amorphous was applied to DFs for thermal conductivity. This mechanical model was obtained by crystallinity and crystal orientation angle measured by solid state NMR and X-ray. Thermal conductivity of DF in fiber direction was dominated by that of the continuous crystal region. The thermal conductivity of the continuous crystal part estimated by the mechanical model increases from 16 to 900 mw/cmK by the increasing temperature from 10 to 150K, and thermal diffusivity of the continuous crystal part was estimated to about 100 mm 2 /s, which is almost temperature independent. The phonon mean free path of the continuous crystal region of DF obtained by thermal diffusivity is almost temperature independent and its value about 200 Å . With the aforementioned, the mechanical series-parallel model composed of crystal and amorphous regions could be applied to DFs for thermal conductivity. V V C 2005 Wiley Periodicals, Inc.

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Section: Resultssupporting

confidence: 77%

Section: ¼ ðEc=qþ 1=2 ð9þmentioning

confidence: 99%

Thermal conductivity of high strength polyethylene fiber in low temperature

Yamanaka

Fujishiro

Kashima

et al. 2005

J Polym Sci B Polym Phys

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“…It is known that sound velocity of polymeric materials depends on temperature 48. On the other hand, the thermal diffusivities of those ramie fibers show almost constant value in the temperature range of 50–250 K. Therefore, the thermal diffusivities of the ramie fibers at room temperature are expected to be almost equal to those at 240 K. The tensile modulus does not decrease, for explaining the decrease of thermal diffusivity by decreasing sound velocity.…”

Section: Resultsmentioning

confidence: 98%

Effects of vapor‐phase‐formaldehyde treatments on thermal conductivity and diffusivity of ramie fibers in the range of low temperature

Yamanaka

Yoshikawa

Abe

et al. 2005

J Polym Sci B Polym Phys

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To understand the influence to thermal conductivity by bridging in the polymer fibers, the thermal conductivity, and thermal diffusivity of ramie fiber and those bridged by formaldehyde (HCHO) using vapor‐phase method (VP‐HCHO treatment) were investigated in the lower temperature range. The thermal conductivities of ramie fiber with and without VP‐HCHO treatments decreased with decreasing temperature. Thermal diffusivities of ramie fiber with and without VP‐HCHO treatments were almost constant in the temperature range of 250–50 K, and increased by decreasing temperature below 50 K. Thermal conductivity and thermal diffusivity of ramie fiber decreased by VP‐HCHO treatment. The crystallinities and orientation angles of ramie fibers with and without VP‐HCHO treatment were measured using solid state NMR and X‐ray diffraction. These were almost independent of VP‐HCHO treatment. Although tensile modulus decreased slightly by VP‐HCHO treatment, the decrease could not explain the decrease in thermal conductivity and diffusivity with decreasing sound velocity. The decrease of the thermal diffusivity and thermal conductivity by VP‐HCHO treatment suggested the possibility of the reduction of the mean free path of phonon by HCHO in VP‐HCHO treated ramie fiber. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 2754–2766, 2005

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“…Sound velocity in a fiber depends on the modulus. In a PBO reinforced uniaxial composite, sound velocity of 9000 m/s was measured at low temperature (77 K) and decreased with increasing temperature 90…”

Section: Propertiesmentioning

confidence: 99%

Rigid‐rod polymeric fibers

Chae

Kumar

2006

J of Applied Polymer Sci

319

169

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This paper traces the historical development of high temperature resistant rigid-rod polymers. Synthesis, fiber processing, structure, properties, and applications of poly(p-phenylene benzobisoxazole) (PBO) fibers have been discussed. After nearly 20 years of development in the United States and Japan, PBO fiber was commercialized with the trade name Zylon in 1998. Properties of this fiber have been compared with the properties of poly(ethylene terephthalate) (PET), thermotropic polyester (Vectran), extended chain polyethylene (Spectra), p-aramid (Kevlar), m-aramid (Nomex), aramid copolymer (Technora), polyimide (PBI), steel, and the experimental high compressive strength rigid-rod polymeric fiber (PIPD, M5). PBO is currently the highest tensile modulus, highest tensile strength, and most thermally stable commercial polymeric fiber. However, PBO has low axial compressive strength and poor resistance to ultraviolet and visible radiation. The fiber also looses tensile strength in hot and humid environment. In the coming decades, further improvements in tensile strength (10 -20 GPa range), compressive strength, and radiation resistance are expected in polymeric fibers. Incorporation of carbon nanotubes is expected to result in the development of next generation high performance polymeric fibers.

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Temperature Dependence of Sound Velocity in High-Strength Fiber-Reinforced Plastics

Cited by 11 publications

References 1 publication

Thermal conductivity of high strength polyethylene fiber in low temperature

Thermal conductivity of high strength polyethylene fiber in low temperature

Effects of vapor‐phase‐formaldehyde treatments on thermal conductivity and diffusivity of ramie fibers in the range of low temperature

Rigid‐rod polymeric fibers

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