巻号一覧
53 巻, 3 号
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村上 一幸, 戸島 宏, 山本 雅晴1997 年 53 巻 3 号 p. 73-78
発行日: 1997/03/10
公開日: 2008/06/30
ジャーナル フリーSeveral kinds of pitch-based carbon fibers were prepared from various mesophase pitches derived from naphthalene, petroleum and coal with a single filament spinning apparatus. The relationships between the dependence of Young's modulus of carbon fibers on spinning viscosity and average molecular structural parameters of mesophase pitches were examined. Aromaticity and compactness factor of pitch were found to be closely related to the dependence of Young's modulus of carbon fibers on spinning viscostiy. The experimental results suggest that the control of average molecular structure of mesophase pitch, as well as bulk properties such as viscosity, is required in order to prepare the precursors for carbon fiber manufacturing.抄録全体を表示PDF形式でダウンロード (466K) -
松田 裕司, 尾鍋 史彦1997 年 53 巻 3 号 p. 79-85
発行日: 1997/03/10
公開日: 2008/06/30
ジャーナル フリーMicrofibrillated Cellulose (MFC) consists of remarkably fibrillated fine fiber. The unique structure of MFC swollen in aqueous suspension was characterized by arithmetic average fiber length and water retention values. Dranage behavior of pulp suspention on wire was controlled by controlling MFC addition to paper stock at wet-end. Furthermore, pigment retention, dye retention and tensile strength were improved by the MFC addition. These advantages of MFC as a wet-end additive for papermaking seem to be due to its large specific surface area and its micro-network formation between pulp fibers in papersheet.抄録全体を表示PDF形式でダウンロード (1707K) -
Toshiharu Enomae, Fumihiko Onabe1997 年 53 巻 3 号 p. 86-95
発行日: 1997/03/10
公開日: 2008/06/30
ジャーナル フリーWhat Parker Print-Surf (PPS) roughness means was discussed by comparing the theoretical equation to that of Bekk smoothness and by determining the wavelength range which PPS represents by the spectral analysis applied to the stylus profiles of paper. As a model of air flow through channels between paper surface and the metal measuring head of an air-leak type smoothness tester, the PPS model is more comprehensible than the Oken type (Bekk) model. However, what the testers survey is fundamentally common to the two methods. Thus, the two equations standing for the models are convertible and the conversion equation was led to be G3=18.65_??_, where G3 is PPS roughness; TB Oken type smoothess. The empirical data exhibited that the conversion equation applies to many papers except those with different compressibility. The correlation between PPS roughness and centerline average (Ra) at several cut-off wavelengths calculated from stylus surface profiles showed that PPS tester presses out paper surface so that the surface shape agrees with roughness at a cut-off wavelength of 234μm for calendered handsheets. This cut-off wavelength gave the least sum of squared deviations from the theoretical conversion equation, G3=2.13×Ra. Oken type smoothness was considered to survey the longer wavelength components than PPS roughness. However, the best-fitting cut-off wavelength was greatly dependent on the surface deformability of paper at a testing pressure in view of papermaking history and converting processes.抄録全体を表示PDF形式でダウンロード (617K) -
Akira Isogai1997 年 53 巻 3 号 p. 96-100
発行日: 1997/03/10
公開日: 2008/06/30
ジャーナル フリーMicrocrystalline cellulose was dissolved in aqueous NaOH by the freezing-defrosting-diluting procedure, and its never-dried regenerated cellulose gel was prepared from the aqueous NaOH solution. Handsheets were then prepared from mixtures of bleached kraft pulp and the regenerated cellulose gel. Mechanical, optical and sizing properties of the handsheets thus prepared were studied in terms of the regenerated cellulose content. Young's modulus and tensile and tearing indices of the handsheets increased with the regenerated cellulose content from 0 to 10%. Especially, folding endurance drastically increased by the addition of the regenerated cellulose. On the other hand, opacity and sizing degrees decreased with the regenerated cellulose content.抄録全体を表示PDF形式でダウンロード (1095K) -
Shigeyuki Nakano, Kazuhiko Komurasaki, Yoshiharu Kimura1997 年 53 巻 3 号 p. 101-106
発行日: 1997/03/10
公開日: 2008/06/30
ジャーナル フリーCotton fibers were shattered by a rotor mill with different sieve meshes and then treated with cellulase to obtain cotton cellulosic powder which could be potentially new material resource. In the initial stage of the enzymatic treatment, the nap formed on the fiber surface during the mechanical shattering was exclusively hydrolyzed. Therefore, the fiber surface of the shattered fiber became smooth, and the weight loss became much larger in the treatment of the shattered fibers than in the treatment of the original cotton fiber. When the treatment time was increased, the fiber length became shorter with many cracks formed inside the fiber. Wide angle X-ray scattering of the enzyme-treated fibers revealed that the crystallinity increased in the initial stage of the treatment, but became constant in the later stage. The specific surfacc area and micropore volume of the fibers sharply decreased in the beginning of the enzymatic treatment, while they increased in the later stage with increasing treatment time. The specific surface area reached a plateau after 50h of treatment with the micropore volume decreasing.抄録全体を表示PDF形式でダウンロード (1540K) -
Hatsuyo Ohyanagi, Miki Inamoto, Fujiharu Nagoya, Sigenobu Matsuda, Kun ...1997 年 53 巻 3 号 p. 107-110
発行日: 1997/03/10
公開日: 2008/06/30
ジャーナル フリーThe polyethylene / dialkylphthalate system was found to exibit liquid-liquid phase separation thermodynamically and microporous membrane consisting of independent spherical-like pore could be prepared by gradual cooling of this system. The addition of styrene hydrogenated butadiene di-block copolymer (SHB) to the above system resulted in the very homogeneous pore structure by spinodal decomposition. For the purpose of clarifying the role of SHB on the pore-structure formation, a preferential staining of SHB by rutenium tetraoxide was made and the membrane was observed by TEM. SHB exists as if encapsulating the pore composed of HDPE backbone and works as a polymeric surfactant between polyethylene-rich and -poor phases and hinders the coarsening of the phase-separated structure.抄録全体を表示PDF形式でダウンロード (2323K) -
Isao Ikeda, Takayuki Hirose, Kimihiro Suzuki1997 年 53 巻 3 号 p. 111-114
発行日: 1997/03/10
公開日: 2008/06/30
ジャーナル フリーCellulosic azo-initiators (CAI) were prepared from cellulose and cellulose acetate (CAc) by treating with a reactive azo-initiator, 4, 4'-azobis(4-cyanopentanoyl chloride) (ACPC) and polymerization of vinyl monomers such as styrene, methyl methacrylate (MMA) and acrylamide was studied with CAI yielding graft copolymers of cellulosics. The rate of polymerization of styrene with CAI from CAc was larger than that with ACPC. Azo groups were found to remain in the CAI after polymerization with styrene and could be used for further polymerization with MMA. In this case, as the grafting of polystyrene of the CAI samples increased, the grafting of poly(MMA) at the second polymerization lowered.抄録全体を表示PDF形式でダウンロード (256K) -
小川 泰子1997 年 53 巻 3 号 p. P81-P86
発行日: 1997/03/10
公開日: 2008/06/30
ジャーナル フリーPDF形式でダウンロード (1051K) -
カイコの総合紡糸馬越 淳, 馬越 芳子, 中村 茂夫1997 年 53 巻 3 号 p. P87-P97
発行日: 1997/03/10
公開日: 2008/06/30
ジャーナル フリーPDF形式でダウンロード (5426K) -
山口 進1997 年 53 巻 3 号 p. P98-P103
発行日: 1997/03/10
公開日: 2008/06/30
ジャーナル フリーPDF形式でダウンロード (502K)
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