巻号一覧
36 巻 (2008)
- 5 号 p. 195-
- 4 号 p. 161-
- 3 号 p. 117-
- 2 号 p. 73-
- 1 号 p. 1-
36 巻, 4 号
選択された号の論文の6件中1～6を表示しています
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論文
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Shyam S.N. Perera2008 年 36 巻 4 号 p. 161-166
発行日: 2008/09/05
公開日: 2008/12/16
ジャーナル フリーPhase-space analysis of the fiber spinning processes has not been reported yet in the literature. The study on phase-space portrait of the melt spinning process is quite important industrially as well as academically because it is closely related to reachability of final velocity and also its theoretical analysis involves the fundamental understanding of the nonlinear dynamics of the process. In this study, we analysed the phase-portrait of simple melt spinning process using isothermal Newtonian, Maxwell-Oldroyd and non-isothermal Newtonian models. We have proven the isothermal and non-isothermal Newtonian models can be solved with any arbitrary final velocity. It has been found that isothermal Maxwell-Oldroyd model has an upper bound for final velocity and which depends on characteristic relaxation time.抄録全体を表示PDF形式でダウンロード (1029K) -
Kenji Nakamura, Toshiyuki Shikata2008 年 36 巻 4 号 p. 167-173
発行日: 2008/09/05
公開日: 2008/12/16
ジャーナル フリーNonlinear viscoelastic behavior of aqueous hybrid threadlike micellar solutions consisting of cetyltrimethylammonium bromide (CTAB) and sodium poly(styrene-ran-sodium styrenesulfonate) (P(St/NaSS)) in water was investigated. Strain-hardening behavior well described with a three-(freely jointed)-chain model was observed when start-up shear flows at shear rates sufficiently higher than the reciprocal of the longest relaxation times were applied to the solutions. The size of segments, which is a reasonable measure of rigidity of hybrid threadlike micelles, evaluated from the number of segments necessary to make the best fit curves to shear stresses with the three-chain model were greater than that of the ordinary threadlike micelles consisting of CTAB and a low molar mass compound, sodium p-toluenesulfonate, possessing similar molecular structure to the monomer of P(St/NaSS). Moreover, the molar mass of segments was independent of the molar mass of incorporated P(St/NaSS)s in the hybrid threadlike micelles.抄録全体を表示PDF形式でダウンロード (752K) -
高取 永一, 志村 尚俊, 山本 武志2008 年 36 巻 4 号 p. 175-180
発行日: 2008/09/05
公開日: 2008/12/16
ジャーナル フリーWe studied the dependence of material properties on molecular weight distribution (MWD) of polymers using high-density-polyethylenes (without short branch chain) with a wide range of molecular weights and known MWD. We discussed the correlations of harmonic-, the arithmetic-, and geometric-mean of MWD with each material properties of melt index, high load melt index, elongation at break, failure point, density, Charpy impact residence, and yield stress. The former four properties were governed by the arithmetic mean of MWD whereas the latter three properties were controlled by the geometric mean of MWD.抄録全体を表示PDF形式でダウンロード (1016K) -
Yuichi Masubuchi, Hiroshi Watanabe, Giovanni Ianniruberto, Francesco G ...2008 年 36 巻 4 号 p. 181-185
発行日: 2008/09/05
公開日: 2008/12/16
ジャーナル フリーConformational relaxation of individual chain molecules in the entangled state has already been investigated by direct observation in fluorescent DNA experiments. Yet, possible connections between the quantity accessible in those experiments and well defined conformational measures have not been established so far. In this study, the relaxation behavior of the individual polymer conformation in the entangled state is simulated through the primitive chain network model, and compared to well known relaxations like that of stress or electric polarization. Inspired by the experiments, we use as a measure of the individual conformation the maximum distance between segments of a given polymer chain, which is often referred to as chain extension, and indicated by the symbol x. The relaxation behavior is calculated as auto-correlation function at equilibrium, suitably ensemble averaged to eliminate the noise. It is found that such x relaxation is significantly different from both stress relaxation and end-to-end dielectric relaxation, though the power-law exponent of the longest relaxation time vs. chain length appears to be the same for both the stress and the x measure.抄録全体を表示PDF形式でダウンロード (707K) -
Tadashi Inoue, Ryo Nakatsuji, Hiroshi Watanabe, Yoshinobu Tsujii2008 年 36 巻 4 号 p. 187-190
発行日: 2008/09/05
公開日: 2008/12/16
ジャーナル フリーThread-like micelles are formed in aqueous solutions of cationic surfactants and a certain type of salts, and for some of these solutions, the strain hardening behavior is observed after inception of shear flow at high shear rates. In the present study, we examined the effect of chemical surface treatments of the cone-and-plate fixture made of glass on measurements of strain hardening behavior of the thread-like micellar solutions. The untreated glass fixture gave significantly weak strain hardening behavior, when compared with the ordinary stainless steel fixture. This could be attributed to the slippage of the solution on the surface of fixture. When the surface of glass fixture was modified with trimethychlorosilane to increase the dispersion component of surface free energy, the pronounced strain hardening was observed. Thus, the surface treatment of rheometer fixtures is very important to examine the nonlinear rheology of thread-like micellar solutions.抄録全体を表示PDF形式でダウンロード (613K) -
Shoichi Murata, Akihiko Takada, Hiroko Yamamoto, Yoshiaki Takahashi2008 年 36 巻 4 号 p. 191-194
発行日: 2008/09/05
公開日: 2008/12/16
ジャーナル フリーTemperature dependence of dynamic viscoelastic properties for 7 wt% solution of aluminum tristearylate (C18Al) in decahydronaphthalene (decalin), prepared by 2 hours heating at 130 °C and 1 day aging at room temperature, are examined. Shapes of dynamic moduli vs. frequency plots are similar to those of entangled polymer systems, implying that this system forms wormlike micelles. Temperature dependence of zero shear viscosity η0 can be expressed by an Arrhenius type equation. The specific viscosities obtained at different temperature are almost constant. Plateau modulus GN gradually increases with increase of temperature T, and the values reduced by absolute temperature are almost constant. The structure examined by small angle neutron scattering and X-ray diffraction was practically the same at different T. Therefore, we conclude that as long as the sample preparation condition is maintained the same, the network structure of C18Al/decalin micelle is practically the same at different temperatures and the main relaxation process of the network is similar to entangled polymers, at least for limited conditions tested in this study.抄録全体を表示PDF形式でダウンロード (580K)
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