巻号一覧
30 巻, 8 号
選択された号の論文の10件中1～10を表示しています
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坂本 孜1974 年 30 巻 8 号 p. P309-P313
発行日: 1974/08/10
公開日: 2008/11/28
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服部 裕1974 年 30 巻 8 号 p. P314-P321
発行日: 1974/08/10
公開日: 2008/11/28
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並木 宏1974 年 30 巻 8 号 p. P322-P328
発行日: 1974/08/10
公開日: 2008/11/28
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三軒 斉, 山本 吉威, 今村 力造1974 年 30 巻 8 号 p. T369-T376
発行日: 1974/08/10
公開日: 2008/11/28
ジャーナル フリーThe dynamic viscoelastic behavior of linear segmented polyether-polyester block copolymers prepared by polycondensation was investigated. Polyethylene-1, 2-diphenoxyethanc-p, p'-dicarboxylate (B) and polyethylene-terephthalate (T) were used as the hard segments of block copolymers, while polyethylene glycol (E) and polyoxybutylene glycol (G) as soft segments.
The temperature dependences of storage modulus E', loss modulus E'' and loss tangent (tan δ) for block copolymers were measured at 10 Mz by Spectrometer.
The results are summarized as follows:
(1) The peak of tan δ of B-E 1540 block copolymer was observed at about -30°C, and E' at rubberlike region were in the order of about 108 dyne/cm2.
(2) With the increase of polyester content, the lowering of E' with increasing temperature became small and tan δmax shifted toward high temperature region.
(3) As the molecular weight of polyether increased, the peak of tan δ became broad and the lowering of E' became small due to the crystallization of polyether, and the values of E' decreased remarkably at the melting temperature of polyether segment.
(4) When the hard segment B was replaced by hard segment T, the tan δmax in T-E1540 was observed in somewhat lower temperature with higher peak intensity than that of B-E1540.
(5) By replacing soft segment E with hard segment G, the tan δmax of B-G1000 shifted to the lower temperature and displayed somewhat broader shape than that of B-E1540.
On the bases of these results, the effects of hard segments on the mobility of soft segments and the intermolecular attraction between soft and hard segment-domains are discussed.抄録全体を表示PDF形式でダウンロード (525K) -
寺田 弘司1974 年 30 巻 8 号 p. T377-T381
発行日: 1974/08/10
公開日: 2008/11/28
ジャーナル フリーMass transfer in wet-spun acrylic fibers during drying process was studied for monofilaments with different polymer compositions. The relation between water transfer in fibers and fine structure of them was made clear.
Equations of diffusion were solved under a boundary condition that radius of monofilament changes with time; the condition was experimentally fixed. The numerical solutions were obtained by electronic computer for a set of given coefficients of diffusion. The coefficients of diffusion for water at all stages of drying were obtained by comparing the experimental values with the calculated ones. The obtained results are as follows:
(1) Diffusion coefficients of water are functions of polymer composition, drying temperature and time; they are in the range of 5 × 10-7_??_5 × 10-6 cm2 /sec.
(2) For the samples composed of such polymers as polyacrylonitrile (PAN), copolymer of acrylonitrile and methyl acrylate (P (AN-MEA)) and terpolymer of acrylonitrile, methyl acrylate and allyl sulfonate (P (AN-MEA-SAS)), the diffusion coefficients decrease with time until the water content in the fiber becomes less than 5_??_10%, but thereafter they increase. This behavior of water transfer during drying process corresponds well with the facts that the fine structure collapses at first stage and the fiber temperature rises at final stage.
(3) In fiber of copolymer of acrylonitrile and allyl sulfonate (P (AN-SAS)), the increase in the diffusion coefficient at final stage is not observed. This is presumably due to the presence of SAS which is the strong hydrophilic component, and suppress the water transfer.
(4) For the compact fibril-void structure like P (AN-SAS) fiber, the water transfer takes place more slowly than for the coarse structure like P (AN-MEA) fiber.
Apparent activation energy of diffusion is about 3 to 5 Kcal/mol for all tested fibers.抄録全体を表示PDF形式でダウンロード (307K) -
後藤 共子, 結城 康夫, 長野 正満, 小田 隆, 高井 博和1974 年 30 巻 8 号 p. T381-T386
発行日: 1974/08/10
公開日: 2008/11/28
ジャーナル フリーThe low carbon steel fiber was obtained by means of the melt spinning conjugated with the vycor glass and the pyrex glass. The fiber was obtained by omitting the glass with NaOH treatment. The properties of the steel fiber were investigated by means of X-ray diffraction technique, scanning electron microscopy, DTA. The results were as follows;
a) The steel fiber (I) obtained by the method of pyrex glass conjugated melt spinning was 20μ in diameter and its tensile strength was 4.4kg/mm2. The fiber (I) was covered with thick iron oxide layer and became 7μ in diameter by omitting the iron oxide.
b) The steel fiber (II) obtained by the method of vycor glass conjugated melt spinning was more than 40μ in diameter and its tensile strength was 40kg/mm2. The fiber axis of (II) was parallel to <110> plane. The degree of orientation of the fiber axis of (II) was about 70% and the crystal grain seize was 300 Å calculated by using the diffractive intensity from (110) plane. The heat treatment of (II) at 650°C resulted in the growth of the crystal grain to 350 Å and the decrease in the tensile strength and the increase in the tensile elongation. The exothermic peak was found at 450°C-600°C in the Differential Thermal Analyses. The height of peak (H) and the exothermic temperature were increased with increased heating rate. Furthermore H decreased with the increase of fiber diameter. From these results, it may be seen that this exothermic peak is due to the release of the stored energy and the process of the glass conjugated melt spinning gives the same working hardenning effect as seen in the cold drawing.抄録全体を表示PDF形式でダウンロード (2534K) -
南後 守, 片山 明, 黒木 宣彦1974 年 30 巻 8 号 p. T387-T390
発行日: 1974/08/10
公開日: 2008/11/28
ジャーナル フリーThe proton magnetic resonance of water in aqueous electrolytes solutions has been determined in the absence and presence of 6M ureas at 34°C. The electrolytes used in this paper are MgCl2 and NaClO4. The former is a typical structure maker and the latter a typical structure breaker. The ureas used are urea, tetramethylurea and 1, 3-dimethylurea. The first two are structure breakers and the last is a structure maker at 6M concentration. All proton shifts, Δδ, were reported in cps relative to pure water or to 6M ureas aqueous solutions. The positive shift for MgCl2 became higher (a downfieled shift) in the presence of urea and tetramethylurea and less positive (an upfield shift) in the presence of 1, 3-dimethylurea. The negative shift for NaClO4 became more negative in the presence of 1, 3-dimethylurea and less negative in the presence of urea and tetramethylurea. These results suggest that urea and tetramethylurea, structure breakers, increase the structuremaking propensity of MgCl2 and decrease the structure-breaking propensity of NaClO4 and that 1, 3-dimethylurea acts vice versa. The effects of ureas on proton shifts for the electrolytes are explained in terms of water structure changes caused by ureas.抄録全体を表示PDF形式でダウンロード (293K) -
松本 恒隆, 中前 勝彦, 岡 英明, 河原井 正義1974 年 30 巻 8 号 p. T391-T398
発行日: 1974/08/10
公開日: 2008/11/28
ジャーナル フリーIn order to show the relationship between the micro structure of crystalline ethylene vinylalcohol (EVA) copolymer and the copolymer component, the density and the thermal expansion of crystalline part and the behavior of hydroxyl group were studied for the EVA copolymers with various components.
The following results were obtained: (1) The crystalline density of EVA copolymer observed by a floatation method was smaller than that evaluated from its unit cell at vinylalcohol (VA) contents under 20 mol%. For the other EVA copolymer with VA contents above 20 mol%, the larger crystalline density compared with the density by calculation from unit cell was always observed, and the VA concentration in the crystalline phase was larger than that of over all copolymer components. (2) According to infra-red spectrum for the hydroxyl group, at VA contents above 30 mol%, the hydrogen bonds were almost formed. (3) The thermal expansion of crystal for EVA copolymer were larger than those of PE and PVA. The expansion of the a axis direction was particularly larger than those of the other directions. From these data, it is reasonable to consider that the hydrogen bond was formed along this direction. (4) The thermal expansion coefficient of EVA copolymers containing VA 20 to 60 mol% was about 2 to 3 times that of EVA copolymer in other ranges of VA contents.抄録全体を表示PDF形式でダウンロード (569K) -
松本 恒隆, 中前 勝彦, 落海 司1974 年 30 巻 8 号 p. T398-T403
発行日: 1974/08/10
公開日: 2008/11/28
ジャーナル フリーIn order to obtain the basic information of wet and dry spinnings of Ethylene-vinylalcohol copolymers (EVA), their solubility was investigated in many solvents and mixed solvents.
The following results were obtained:
1. Solubility of various EVA were closely related to solubility parameter (δ) of solvents and were, especially, interpreted with polar component (δp) and hydrogen-bonding component (δh) of the solubility parameter.
2. Proton donating solvents such as m-Cresol, Phenol, Ethylene chlorohydrin and Dimethyl sulfoxide showed good solubility to EVA.
3. Low vinylalcohol content EVA tended to dissolve in Benzene-Methanol mixed solvents, while high vinylalcohol EVA tended to dissolve in Methanol-Water mixed solvents.
4. In case of EVA (vinylalcohol 73.4mol%) in n-Propanol/Water (8/2 vol. ratio), both lower and upper critical solution temperatures (LCST and UCST) were observed.抄録全体を表示PDF形式でダウンロード (402K) -
脇田 登美司, 北尾 好隆, 黒木 宣彦1974 年 30 巻 8 号 p. T404-T408
発行日: 1974/08/10
公開日: 2008/11/28
ジャーナル フリーThe effect of urea on the heat conduction during high temperature steaming with humid air was studied using a paper cylinder in relation to temperature rise, water condensation and the reevaporation of condensed water.
The following results were obtained.
In a paper cylinder during high temperature steaming with humid air, water condensed much more in the presence of urea than in its absence, and the condensed water did not reevaporate even at dewing temperature, because of the high hygroscopic property of urea and the elevation of boiling point. Therefore, the reevaporation temperature of the condensed water was raised with the increases of Absolute Humidity and urea content. Furthermore, reevaporation condensed water was prolonged by addition of urea.抄録全体を表示PDF形式でダウンロード (378K)
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