巻号一覧
50 巻, 3 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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島村 薫, 石飛 三千夫, 内田 哲也, 鈴木 信1994 年 50 巻 3 号 p. 101-104
発行日: 1994/03/10
公開日: 2008/11/28
ジャーナル フリーPoly (p-phenylenebenzobisthiazole) P (PBZT) chains with average molecular length of 61 nm have been reacted with trimesic acid to link each other. The product, a mixture of Y-, V-shaped and linear P (PBZT)'s, was dissolved into conc. H2SO4 at a concentration of 0.1 wt%, and isothermally crystallized.
The precipitate was composed essentially of curved rod-like crystals. Four or five crystals having different length coagulated each other with many branches at an angle of ca 60°. This morphological feature was in contrast to that of pure linear P (PBZT) precipitate in which several tens straight rod-like crystals of the same length were oriented parallel to each other to make a group. This difference in morphology between linear P (PBZT) and the mixture of Y, and V-shaped and linear P (PBZT)'s was well explained by the crystallization mechanism of P (PBZT).
100 lattice fringe was observed throughout the central area of the rod-like crystal. This means that the center was composed of linear part of Y-, V-shaped and linear polymers, which were accomodated normal to the rod. In some area, the 001 lattice fringe crossed 100 lattice fringe at an angle of ca 75°, suggesting that P (PBZT) unit cell might not be Fratini's monoclinic type. On both sides of the 100 lattice fringe, there were dark belts. These belts corresponded to thick parts which were composed of the other counterparts in the Y- and V-shaped polymers.抄録全体を表示PDF形式でダウンロード (1450K) -
松本 喜代一, 田所 信彦1994 年 50 巻 3 号 p. 105-109
発行日: 1994/03/10
公開日: 2008/11/28
ジャーナル フリーThe relationship between molecular orientation and mechanical properties of poly (methyl methacrylate) films prepared by various types of stretching was investigated. The specimens were prepared by stretching the hot-pressed films to various ratios under two rates of 50 or 100%/min at 110-120°C in a circulating hot air bath. The Stretching methods were two types of uniaxial strechting with free and constant width, and simultaneous biaxial stretching. For the estimation of molecular orientation, the birefringence were measured using a tilting technique. Mechanical properties are discussed in terms of stress-strain curves.
The following results were obtained:
(1) The molecular orientation in the films uniaxially stretched with free width was uniaxial with cylindrical symmetry around the stretching axis, and the anisotropy of mechnical properties in the machine direction is greater than that of the other samples.
(2) The uniaxially stretched films with constant width showed a uniplanar-axial orientation, in which the direction of molecular chain was parallel to the stretching axis and the film surface, Thus, Young's module were nearly equal in both the machine and transverse directions.
(3) For the simultaneousbiaxially stretched films, the molecular chain showed a uniplanar orientation, which was a random orientation within the film along with parallel to film surface, at all stretch ratios. Mechanical properties of balanced films were isotropic in the film plane regardlless of the stretch ratio, and increased with stretching ratio.
(4) On the transmittance of film for ultraviolet-visible radiation, all stretched films were slightly transparent than that of the unstretched film.抄録全体を表示PDF形式でダウンロード (339K) -
許斐 毅志, 鹿垣 美香, 佐藤 由美, 坂田 桂子, 杉浦 弘子1994 年 50 巻 3 号 p. 110-117
発行日: 1994/03/10
公開日: 2008/11/28
ジャーナル フリーNovel salts of poly(ethylene terephthalate) (PET) modified by grafting with poly(acrytic acid) (PAA) were prepared using salts of amines and Na salts of amino acid analogue, as well as of alkali and alkali earth metal. Changes in hygroscopicity, tensile properties, bending rigidity of fabric, electrostatic property, and thermal stability by the grafting and the salt formation were investigated.
In the case of amine and alcohlic amine salts, moisture regain were reduced due to the steric hindrance, in adsorbing site for water molecule, in the presence of bulky alkyl groups attached to nitrogen atom. For the samples reacted with alkali metal salts, hygroscopicity increased with ionic strength of metal. By alkali metal salt formation, tensile strength decreased by 25% in comparison with that of PAA-grafted PET. On the other hand, fibers reacted with novel salts retained the tensile strength same as that of PAA-grafted PET. Moreover, PET fabrics modified as mentioned above showed slight decrease of bending rigidity. The activation energy for thermal degradation reaction was estimated by moltiple heating rate method by thermogravimetry. It was elucidated that the thermal stability of the above samples was generally reduced except the sample reacted with Ca ion.抄録全体を表示PDF形式でダウンロード (533K) -
Koki Itoyama, Siichi Tokura1994 年 50 巻 3 号 p. 118-123
発行日: 1994/03/10
公開日: 2008/11/28
ジャーナル フリーChitosan porous beads were prepared by coagulating chitosan acetate aqueous dope in basic alcohol. The N-succinylation and O-carboxymethylation were achieved by applying succinic anhydride and monochloroacetic acid, respectively, following the partial crosslinking to make acid durable chitosan beads. The degree of succinylation was regulated by applying acetic anhydride to block the amino group following the crosslinking. The NaOH concentration was a regulation factor for the carboxymethylation. The adsorption mechanisms of lysozyme on chemically modified beads were found to be different each other. The elution profile was affected by the pH shift, but not by ionic strength unlikely those of carboxymethyl-cellulose. N-acetylglucosamine (GlcNAc), saccharose and urea were found to inhibit the interaction of lysozyme with carboxylated chitosan beads in the presence of NaCl. The adsorption of lysozyme was achieved derectly from egg white and eluted fraction contained lysozyme of high purity.抄録全体を表示PDF形式でダウンロード (830K) -
Siripong Premjet, Yoshito Ohtani, Kazuhiko Sameshima1994 年 50 巻 3 号 p. 124-128
発行日: 1994/03/10
公開日: 2008/11/28
ジャーナル フリーHigher cellulose production was observed in a new culture medium (named KC medium) consisting of a sulfite pulping waste fraction (named CP powder), glucose, yeast extract, peptone and buffer components as compared with the standard 2% glucose Hestrin-Schramm culture medium (HS medium). Acetobacter xylinum ATCC 10245 cultivated in KC meduim of 2% glucose gave high cellulose yields (296%), and the highest yield was obtained at the 3% dosage of glucose and 0.5% dosage of the CP powder (326%). The fractionation and the ion exchange experiments suggested that the high molecular lignosulfonate contributed to the yield enhancement.抄録全体を表示PDF形式でダウンロード (1500K) -
金綱 久明, 柏原 洋子, 川村 綾1994 年 50 巻 3 号 p. 129-135
発行日: 1994/03/10
公開日: 2008/11/28
ジャーナル フリーThe effects of the inter-yarn pores on the moisture and air permeation through textile fabrics were investigated by the water method and KES method for three kinds of fabric groups, spun yarn fabrics and filament yarn ones as well as stainless steel meshes. Their moisture permeability measured under various environmental humidity conditions at 20°C were discussed in relation to the pore size of the sample. The bi-logarithmic plot of the mean area per pore and the moisture permeability per unit pore area showed a linear relationship with a negative gradient, the line of which shifted in parallel toward a region of higher permeability as the environmental humidity was decreased. Comparing the moisture permeation behavior of the sample fabrics under the same condition revealed that the permeability was larger in the order of the steel mesh group, the spun yarn fabric group, and the filament yarn fabric one. Similar relation of order was found also in the slope of the linear dependency above. The relations between the pore size and air permeability of the fabrics were also studied together.抄録全体を表示PDF形式でダウンロード (502K) -
中野 恵之, 礒野 禎三, 古谷 稔, 仙崎 俊明, 鈴木 道隆1994 年 50 巻 3 号 p. 136-141
発行日: 1994/03/10
公開日: 2008/11/28
ジャーナル フリーA new apparatus was produced for the measurement of specific surface areas of silk fabrics before and after treatment with low-temperature oxygen plasma. The specific surface area gradually decreased and then increased with treatment time. The decrease at the early stages was ascribed to an etching effect, and the change in specific surface area was related to the weight decrease. The plasma treatment formed a modulated structure on the surfaces of treated silk fibers, and its size increased with treatment time. However, the modulated structure was not related to the specific surface area.抄録全体を表示PDF形式でダウンロード (935K) -
今井 淑夫1994 年 50 巻 3 号 p. P85-P90
発行日: 1994/03/10
公開日: 2008/11/28
ジャーナル フリーPDF形式でダウンロード (992K) -
永野 広作1994 年 50 巻 3 号 p. P91-P95
発行日: 1994/03/10
公開日: 2008/11/28
ジャーナル フリーPDF形式でダウンロード (1279K) -
毛利 裕1994 年 50 巻 3 号 p. P96-P101
発行日: 1994/03/10
公開日: 2008/11/28
ジャーナル フリーPDF形式でダウンロード (805K) -
佐々木 重邦1994 年 50 巻 3 号 p. P102-P105
発行日: 1994/03/10
公開日: 2008/11/28
ジャーナル フリーPDF形式でダウンロード (1833K) -
Ruth H. Pater1994 年 50 巻 3 号 p. P106-P118
発行日: 1994/03/10
公開日: 2008/11/28
ジャーナル フリーPDF形式でダウンロード (1197K) -
和田 有文1994 年 50 巻 3 号 p. P119-P122
発行日: 1994/03/10
公開日: 2008/11/28
ジャーナル フリーPDF形式でダウンロード (1275K)
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