巻号一覧
33 巻, 1 号
選択された号の論文の13件中1～13を表示しています
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大沢 直志, 中山 晃, 三輪 実, 長谷川 明1977 年 33 巻 1 号 p. T1-T6
発行日: 1977/01/10
公開日: 2008/11/28
ジャーナル フリーIn the short glass fiber-thermosetting resin composites the critical fiber length is one of the dominating causes for the effect of reinforcement. In this paper, a method was devised to determine the critical fiber length accurately, and the temperature dependence of the critical fiber length was studied for the glass fiber-epoxy resin and glass fiber-unsaturated polyester resin composites.
If a continuous glass fiber is embedded in the resin and the system is elongated more than fiber breaking strain, a continuous fiber is broken in many pieces. If the average length of these pieces l is measured, the critical fiber length lc is given with lc=4/3_??_.
The critical fiber lengths increase with the increase in temperature greatly and the interfacial shear strengths calculated with these values decrease in proportion to temperature rise in the region of 40°C_??_120°C. This trend of decrease can be explained mainly by the decrease of shear strengths of matrix with increase in temperature in case of which glass fiber surfaces are treated with silan coupling agent, and by the relaxation of thermal stress and secondary bond at interface with increase in temperature in case of which glass fiber surfaces are treated with release agent.抄録全体を表示PDF形式でダウンロード (1521K) -
岡川 千勝1977 年 33 巻 1 号 p. P3-P6
発行日: 1977/01/10
公開日: 2008/11/28
ジャーナル フリーPDF形式でダウンロード (417K) -
三輪 実, 中山 晃, 大沢 直志, 長谷川 明1977 年 33 巻 1 号 p. T6-T12
発行日: 1977/01/10
公開日: 2008/11/28
ジャーナル フリーThe temperature dependence of the tensile strengths of epoxy resin and unsaturated polyester resin reinforced with random-planar orientation of short glass fibers was studied.
In both composites, the tensile strength decrease with increase in temperature and the trend of decrease can be explained by the following formulae with the critical fiber length lc and the interfacial shear strength τ determined by means of our previous paper, where σcs, is the tensile strength of composite material reinforced with random-planar orientation of short fiber, L and d are the fiber length and the fiber diameter, respectively, σ and V are the tensile strength and the volume fraction, and subscript f and m presents fiber and matrix, respectively. Also σm′ is the stress of matrix on the fracture strain of composite material.
Further the experimental values at the room temperature is smaller than the theoretical values and the difference can be explained by the thermal stress produced in molding owing to the large difference of thermal expansion coefficient between glass fiber and matrix resin.抄録全体を表示PDF形式でダウンロード (1134K) -
児玉 宏1977 年 33 巻 1 号 p. P7-P11
発行日: 1977/01/10
公開日: 2008/11/28
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梶 加名子, 岡田 己夫, 桜田 一郎1977 年 33 巻 1 号 p. T12-T19
発行日: 1977/01/10
公開日: 2008/11/28
ジャーナル フリーRadiation grafting of acrylic acid was carried out on poly (vinyl chloride) fiber to improve the softening temperature without serious damage to its flame-retardance.
Grafting of acrylic acid proceeded smoothly when ethylene dichloride and water were mixed with the monomer. A small amount of Mohr's salt was added to the mixture to suppress the formation of acrylic acid homopolymer outside of the fiber. Grafting was performed either by the immersion method using γ-rays from a Cobalt-60 sources or by the impregnation method using electron beams from a Van de Graaff accelerator. In the case of the impregnation grafting, 30% grafting was easily obtained by irradiating 2 seconds at a dose rate of 0.1 Mrad/sec.
Grafted fibers showed higher heat-shrinkage temperatures especially when acrylic acid was converted to the calcium salt. Damage to the flame-retardance was not serious, as fibers of 100% graft kept the self-extin-guishing property of the original specimen. The hydrophilic property was also improved, and the sodium salt of 15-20% graft showed the same level of moisture regain as cotton.抄録全体を表示PDF形式でダウンロード (1195K) -
江尻 弘1977 年 33 巻 1 号 p. P12-P15
発行日: 1977/01/10
公開日: 2008/11/28
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石川 不二夫1977 年 33 巻 1 号 p. P16-P23
発行日: 1977/01/10
公開日: 2008/11/28
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島田 尚信, 国松 朗, 古畑 研一, 酒井 哲也1977 年 33 巻 1 号 p. T19-T26
発行日: 1977/01/10
公開日: 2008/11/28
ジャーナル フリーThe carbonization and the graphitization of bamboo was studied. Bamboo has high crystallinity, high degree of orientation and is a composite material in nature consisting of fibrous and soft connective tissues.
The thermal decomposition of the soft connective tissue started at lower temperature and more vigorously as compared with that of the region of fibers. This tendency is more obvious at slow heating rates in the carbonization process.
Graphite-like crystallites are formed preferentially around the fibrous tissue, which has a high degree of orientation and high crystallinity in the raw material. The laminar two-dimensional structure of carbon was formed at the early stage of the graphitization process and then the growth in the direction perpendicular to the plane followed.
The layer distance of the graphitized sample (3.37A), which was somewhat different from that of the natural graphite (3.354A), and other experimental data showed that bamboo is one of the non-graphitizing materials.抄録全体を表示PDF形式でダウンロード (1640K) -
中込 省三1977 年 33 巻 1 号 p. P24-P29
発行日: 1977/01/10
公開日: 2008/11/28
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片岡 忠夫, 大西 俊次, 山本 正秀, 北野 武, 高山 英勝, 中間 克美1977 年 33 巻 1 号 p. T26-T31
発行日: 1977/01/10
公開日: 2008/11/28
ジャーナル フリーAn elastic melt extruder was constructed for extrusion of filler/polymer. Fillers used were glass beads, calcium carbonate powder, glass fiber and carbon fiber. The extrusion was stable for the time duration of practical use.
In the extrusion of filler/polyethylene, the mixing of both components was satisfactory and the filler dispersed uniformly in the extrudate. By assuming instantaneous mixing of the components in the shearing zone of the extruder, theoretical equations for the variation of filler-content in the extrudate with time were derived. The experimental results well reproduced the equations.抄録全体を表示PDF形式でダウンロード (402K) -
うらべ まこと1977 年 33 巻 1 号 p. P30-P35
発行日: 1977/01/10
公開日: 2008/11/28
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飯田 昌造1977 年 33 巻 1 号 p. T31-T38
発行日: 1977/01/10
公開日: 2008/11/28
ジャーナル フリーThe relationship between stress and draw ratio of crystalline polymer during the ultra draw were investigated in terms of phase equilibrium under stress between the crystalline phase and amorphous phase which is induced by the fracture of crystallite during the deformation. The two types of deformation were considered; one is that caused when the folded chain crystals are fractured by stretching (F type deformation), the other when the folded chain crystals as well as tie links which are induced during the ultra draw were fractured (FT type deformation). From the thermodynamical consideration on the phase equilibrium the stress at an extremely low draw rate, the critical stress σc, was obtained as
where x: crystallinity, ΔGm: Gibbs' free energy of fusion, αn: neck draw ratio, αm: maximum draw ratio at perfectly extended state, and α: draw ratio during ultra draw.
The stress-draw ratio relation of polyethylene was studied at the temperatures from 30°C to 120°C and at the draw rate from 1 to 1000mm/min. It was found for linear polyethylene that F type deformation occurs by the stretching at low draw rate and at high temperature, whereas FT type deformation occurs by stretching at high draw rate and at low temperature. As for the crosslinked polyethylene which was obtained by γ-ray irradiation at the dosage of 10 and 20Mrad, FT type deformation occurred in all stretching conditions.
The maximum draw ratio could not be measured by experiment because the rupture took place before the maximum extention. The ratio was obtained only for crosslinked polyethylene by fitting the master curve of stress-draw ratio which was obtained theoretically for FT type deformation to the logarithmic plots of stress-draw ratio relation obtained by experiment. The maximum draw ratios obtained by this method were in good agreement with that calculated from the chain length between crosslinks. It was proved from these results that the adopted models are suitable for explaining the deformation mechanisms.抄録全体を表示PDF形式でダウンロード (565K) -
堀 照夫, 山内 栄司, 清水 融1977 年 33 巻 1 号 p. T38-T43
発行日: 1977/01/10
公開日: 2008/11/28
ジャーナル フリーAs a simple model for describing the dyeing mechanism of textile assembly, the columnchromatography in which dye is transported through porous media by liquor flow was supposed. Mathematical description for distribution of dye in the column has been developed by assuming the stage theory and the pulse flow.
The derived equation contains two new factors, the diffusion factor α, which is related to the size of adsorbent particles, and the effective rate factor β, which is related to the developing rate. In order to examine the derived equation several experiments, which show the effects of (1) Partition coefficient, (2) eluting volume, (3) particle size of adsorbent and (4) porosity of column on the distribution-profile, were made.
The values of αβ and a (width of sample solution expanded by addition), which were obtained by comparing the experimental data and theoretical curves, were reasonable.抄録全体を表示PDF形式でダウンロード (397K)
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