巻号一覧
55 巻, 8 号
選択された号の論文の11件中1～11を表示しています
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久保川 博夫, 畠山 立子1999 年 55 巻 8 号 p. 349-355
発行日: 1999/08/10
公開日: 2008/11/28
ジャーナル フリーThe thermal decomposition behavior of polylactide fabrics treated with tetrabromobisphenol A (TBP-A) or triphenylphosphate (TPP) in suspension was studied by thermogravimetry (TG) and differential thermal analysis (DTA). The TG analysis showed that the thermal decomposition of a TBP-A-treated sample with the limiting oxygen index (LOI) of 25.9 and 4.98wt/wt% of TBP-A was accelerated both under nitrogen and under air. When this sample was heated under air, the exothermic reaction was retarded in comparison with the untreated sample. The amount of remained char of the sample was larger than that of the untreated. The sorbed TBP-A was considered to lead the thermal decomposition of polylactide through a mechanism different from that of the untreated polylactide. The TG curve of a TPP-treated sample with LOI of 27.8 and 2.96wt/wt% measured under nitrogen was similar to that of the untreated sample. The weight loss of the treated sample was higher than that of the untreated below 374°C and became considerably lower above the temperature, when measured under air. The kinetic study was made under nitrogen based on the TG data measured at different heating rates. Almost all of the sorbed TPP seemed to be decomposed by the same mechanism to that of free TPP and to be removed from the sample.抄録全体を表示PDF形式でダウンロード (538K) -
Kenichiro Arai, Yasunori Kanou1999 年 55 巻 8 号 p. 356-360
発行日: 1999/08/10
公開日: 2008/11/28
ジャーナル フリーDeoxyamino-co-tosylcellulose (DATC) was prepared by nucleophilic substitution of the p. toluenesulfonyl (tosyl) group of cellulose p-toluenesulfonate [tosylcellulose; degree of substitution (DS) by tosyl group (DStosyl)=0.92], which had been heterogeneously prepared from microcrystalline cellulose, by NH3 in water. In the substitution, DS by amino group (DSamino) increased with increasing reaction temperature and with reaction time, and reached up to 0.48 at 70°C for 96h, while DStosyl decreased to 0.05 under the same conditions. Ability of the obtained DATC powder to remove detrimental gases in the air was examined. The amount of adsorbed gaseous acetaldehyde increased with increasing DSamino of DATC, and about 70% of acetaldehyde of 1.15wt.% in 1.6L air was removed by 1.0g of DATC with DSamino of 0.48 after 24h. Adsorption of gaseous acetic acid showed a similar tendency but with slightly larger amounts. The amount of adsorbed n-propylamine decreased with increasing DSamino, the decrease being deduced to result from a decrease in the amount of tosyl groups in DATC. Regeneration of the ability of DATC, which had once adsorbed acetaldehyde gas, was examined. The abitity to remove acetaldehyde was almost perfectly recovered by washing with a dilute acid aqueous solution.抄録全体を表示PDF形式でダウンロード (311K) -
辻本 純一, 村上 昌三, 辻 正樹, 〓谷 信三1999 年 55 巻 8 号 p. 361-368
発行日: 1999/08/10
公開日: 2008/11/28
ジャーナル フリーUnoriented films of poly (tetramethylene succinate) [PTMS] were uniaxially drawn at a given temperature (basically at room temperature and occasionally at elevated temperatures). In their drawing process, stress-strain measurements and time-resolved wide-angle X-ray diffraction [WAXD] experiments were carried out.
In the drawing process, at first the chain axes (c-axes) of α-form crystallites were gradually oriented in the drawing direction via necking, and then the solid-state phase transformation from α- to β-form crystals occurred increasingly by further drawing. The stress at which the transformation took place was always greater than the yielding stress that was recorded just before the onset of necking. Even at diffrent drawing temperatures ranging from room temperature to 110°C, the transformation occurred at the approximately same strain (or draw ratio), but the stress at which the tranformation took place decreased with increasing temperature.
After a run of uniaxial drawing, the sample strip was held still at the final length for more than 120min, but its WAXD pattern displayed only the β-form reflections during such a holding process. In the case of the strip held at a constant strain of 640% for 120min, the stress thereby decreased by 25%, but no α-form reflections were observed in the WAXD pattern. When the stress was fully released, the reflections of β-form disappeared completely and those of α-form appeared again: Finally the uniaxially oriented film of PTMS consisting of α-form crystals was obtained.抄録全体を表示PDF形式でダウンロード (1975K) -
中村 肇伸, 寺本 彰, 八森 章, 阿部 康次1999 年 55 巻 8 号 p. 369-375
発行日: 1999/08/10
公開日: 2008/11/28
ジャーナル フリーIn this paper, silk fibroin-chitosan membranes (SFCS) composed of silk fibroin and chitosan 70 were prepared to evaluate their properties and the effects of these membranes on the functions of macrophage. It was apparent that the solubilities of SFCS in PBS (-) were suppressed in comparison with chitosan or fibroin membranes. This was considered to be result of the high orientation of molecules though the strong hydrogen bonding between the molecules of silk fibroin and chitosan. It was clarified that human serum albumin (HSA) and human immunoglobulin G (IgG) were adsorbed onto SFCS mainly caused by an electrostatic interaction between the proteins and SFCS. Moreover the results of cytotoxicity assay showed that cellular affinities of SFCS were increased with decreasing chitosan content. In general, the surfaces of materials were covered with proteins at first in vivo, and then the cellular responses, e. g. the inflammatory responses which is mainly controlled by the macrophages, were controlled by the adsorbed proteins. Therefore, SFCS, which could control protein adsorption and the effects of macrophage-like cell by changing mixing ratio, might be make possible to control the functions of macrophage.抄録全体を表示PDF形式でダウンロード (1288K) -
進藤 忠文, 前田 博己, 安藤 雅之1999 年 55 巻 8 号 p. 376-382
発行日: 1999/08/10
公開日: 2008/11/28
ジャーナル フリーLiquid crystal/polymer composite (LCPC) films were prepared by electron beam polymerization of nematic liquid crystal and two-functional monomer (EB-LCPC) and by emulsification of nematic liquid crystal using polyvinylalcohol (PVA-LCPC). A factor related to hysteresis of these film was investigated by analyzing the dependence of transmittance and capacitance on applied voltage. EB-LCPC was smaller in the hysteresis and the applied voltage dependence of hysteresis than PVA-LCPC. It was assumed that hysteresis occurs by structure change of LCPC film due to molecular motion of its polymer matrix.抄録全体を表示PDF形式でダウンロード (515K) -
篠崎 真, 田島 洋, 宮本 誠一1999 年 55 巻 8 号 p. 383-392
発行日: 1999/08/10
公開日: 2008/11/28
ジャーナル フリーA novel evaluation method for the paper formation is developed. The commercial wood free paper specimens, which were ranked previously following a modified Scheffe method by a group of panelists who are familiar with paper products, were used. The light transmission distributions of the specimens were prepared using an image scanner. The dispersion and the power spectrum for the light transmission were used for the linear multiple regression analysis to the human visual ranking of the specimens. The spectrum was obtained by the two-dimensional Fourier transformation analysis of the 256 × 256 pixels image. For the regression analysis, power ratio for all the combinations of the 127 × 126/2 of wave bands were used with the dispersion. It was found that the analyzed result agrees well with the human visual ranking when the wave band between 5.7 and 6.2mm is selected. This means that the human eyes are sensitive to this wave band which corresponds to the size of flocs and/or streaks in the paper. It was also found that the Elrepho brightness affects the visual ranking of the paper formation while the Tappi opacity does not.抄録全体を表示PDF形式でダウンロード (2382K) -
川合 康夫1999 年 55 巻 8 号 p. P259-P264
発行日: 1999/08/10
公開日: 2008/11/28
ジャーナル フリーPDF形式でダウンロード (2081K) -
小柳 隆, 守屋 隆夫1999 年 55 巻 8 号 p. P265-P269
発行日: 1999/08/10
公開日: 2008/11/28
ジャーナル フリーPDF形式でダウンロード (1030K) -
高梨 隆雄1999 年 55 巻 8 号 p. P271-P275
発行日: 1999/08/10
公開日: 2008/11/28
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原田 隆司1999 年 55 巻 8 号 p. P276-P282
発行日: 1999/08/10
公開日: 2008/11/28
ジャーナル フリーPDF形式でダウンロード (1846K) -
松村 佐知子1999 年 55 巻 8 号 p. P283-P287
発行日: 1999/08/10
公開日: 2008/11/28
ジャーナル フリーPDF形式でダウンロード (2213K)
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