Drawing Effect on Thermal Properties of High-Strength Polyethylene Fibers

Fujishiro, Hiroyuki; Ikebe, Manabu; Kashima, Toshihiro; Yamanaka, Akihiro

doi:10.1143/jjap.37.1994

Cited by 35 publications

(50 citation statements)

References 7 publications

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“…Thus, high‐crystallization and high‐orientation polymers exhibit high thermal conductivity 11–16. For example, highly crystallized polymer materials, including high‐strength polyethylene fiber16–19 and high‐strength polypara‐phenylene‐benzo‐bisoxazole fiber17 are known to possess high thermal conductivity similar to that of metals. The thermal conductivity of polymers, therefore, ranges from high to low depending on the crystal structure or morphology.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…3,6 -10 Temperature dependence of optical property of fiber Bragg grating can be controlled by using a package composed of DFRP. 5 The negative expansion property is important for applications for cryogenic or information use as low frictional property, 11,12 high thermal conductivity, 13,14 and high electrical resistance. 15 It is known from X-ray studies that the thermal expansion coefficient of polymer crystals, for example polyethylene, in the direction of the chain axis measured is negative for most if not all polymers.…”

Section: Introductionmentioning

confidence: 99%

Thermal strain of high strength polyethylene fiber in low temperature

Yamanaka

Kitagawa

Tsutsumi

et al. 2004

J of Applied Polymer Sci

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ABSTRACT:High strength polyethylene fiber (Toyobo, Dyneema® fiber: hereinafter abbreviated to DF) has a negative thermal expansion coefficient. Relation between fiber structure and thermal strain of DF used as reinforcement of DF reinforced plastic (DFRP) for cryogenic use was investigated. The crystallinities and orientation angles of several kinds of polyethylene fibers having different modulus from 15 to 134Gpa (herein after abbreviated to DFs) were measured by NMR and X-ray. We obtained the parameters of the mechanical series-parallel model composed of crystal and amorphous by crystallinity and modulus. Thermal expansion coefficients of DFs were estimated by mechanical seriesparallel model. All DFs having different modulus showed negative thermal expansion coefficients in the temperature range from 180 to 300K, and absolute values of those markedly increased by increasing tensile modulus of DF. The estimated thermal expansion coefficients showed negative values, and thermal strains showed a similar curve to observed ones mostly. Average thermal expansion coefficients in the temperature range from 180 to 300K estimated by mechanical model agreed with the observed ones.

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“…The details of the determination of the thermal conductivity are described elsewhere. 18,19 Thermal diffusivity…”

Section: Thermal Conductivitymentioning

confidence: 99%

“…The automated measuring system of the thermal diffusivity was operated from 10 to 150 K. The details of the determination of the thermal diffusivity are described elsewhere. 18,19 To measure the water contents of the samples used in the measurements of the thermal conductivity and thermal diffusivity, the samples were stored in a high vacuum below 10 Ϫ3 Pa for 24 h in the sample space in the same way used for the measurement of the thermal conductivity. The weights of those samples were defined as W. The dried samples were obtained by the drying of those samples at 383 K for 8 h in vacuo at 1 Pa, as described elsewhere.…”

Section: Thermal Conductivitymentioning

confidence: 99%

“…Thus, high-crystallization and high-orientation polymers exhibit high thermal conductivity. [11][12][13][14][15][16][17] For example, highly crystallized polymeric materials, including high-strength polyethylene fiber 11,[17][18][19] and highstrength poly(para-phenylenebenzobisoxazole) fiber, 18 are known to possess high thermal conductivity similar to that of metals. The thermal conductivity of polymers, therefore, ranges from high to low, depending on the crystal structure or morphology.…”

Section: Introductionmentioning

confidence: 99%

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Radiation effect on the thermal conductivity and diffusivity of ramie fibers in a range of low temperatures by γ rays

Yamanaka¹,

Izumi²,

Terada³

et al. 2006

J of Applied Polymer Sci

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ABSTRACT:To understand the influence on the thermal conductivity by the length of the molecular chain in the polymer fiber, the thermal conductivity and thermal diffusivity of ramie fibers and those irradiated by ␥ rays, which induced molecular chain scission of cellulose, were investigated in a range of low temperatures. The degrees of polymerization, crystallinities, and orientation angles of ramie fibers and those irradiated by ␥ rays (␥-ray treatment) were measured by the solution viscosity method, solid-state NMR, and X-ray diffraction. Only the degree of polymerization decreased with the ␥-ray treatment, and the crystallinities and orientation angles were almost independent of the ␥-ray treatment. The thermal conductivities of the ramie fibers with and without ␥-ray treatments decreased with decreasing temperature. The thermal diffusivities of the ramie fibers and those irradiated by ␥ rays were almost constant from 250 to 100 K, increased slightly with the temperature decreasing from 100 to 50 K, and increased rapidly with the temperature decreasing below 50 K. The thermal conductivity and thermal diffusivity of the ramie fibers decreased with the ␥-ray treatment. The mean free path of the phonon in the ramie fibers was reduced by the ␥-ray treatment. This decrease of the thermal diffusivity and thermal conductivity was explained by the reduction of the mean free path of the phonon by molecular chain scission with ␥ rays.

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Drawing Effect on Thermal Properties of High-Strength Polyethylene Fibers

Cited by 35 publications

References 7 publications

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

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

Thermal strain of high strength polyethylene fiber in low temperature

Radiation effect on the thermal conductivity and diffusivity of ramie fibers in a range of low temperatures by γ rays

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