Journal of the Society of Rheology, Japan最新文献_第6页

Flow-Induced Structure Change and Flow-Instability of CTAB/NaSal Aqueous Solution in a Two-Dimensional Abrupt Contraction Channel CTAB/鼻腔水溶液在二维突然收缩通道中的流致结构变化和流动不稳定性

Journal of the Society of Rheology, Japan Pub Date : 2006-11-21 DOI: 10.1678/RHEOLOGY.34.229

M. Ouchi, Tsutomu Takahashi, M. Shirakashi

{"title":"Flow-Induced Structure Change and Flow-Instability of CTAB/NaSal Aqueous Solution in a Two-Dimensional Abrupt Contraction Channel","authors":"M. Ouchi, Tsutomu Takahashi, M. Shirakashi","doi":"10.1678/RHEOLOGY.34.229","DOIUrl":"https://doi.org/10.1678/RHEOLOGY.34.229","url":null,"abstract":"It is known that the CTAB/NaSal aqueous solution forms wormlike micelles when the concentration is higher than a certain value and shows the flow-induced structure change when both the shear rate and shear strain exceed respective critical values. In the present work, the start-up behavior of this surfactant solution in a two-dimensional abrupt contraction channel driven by a constant pressure was investigated. At a low driving pressure, the flow rate increases gradually and reaches an equilibrium state. When the driving pressure is higher than a certain value, the flow rate rises at a certain elapsed time. The elapsed time showing increase in flow rate shortens with increasing driving pressure. In the entry area of the narrow channel, a pair of wedge shape opaque regions appears. From the comparison with the observation in Couette flow of the same solution, it is found the opaque regions are caused by shear induced structure and the viscosity of the regions is higher than the other region. The regions grow up and make the other region with low viscosity narrower. The opaque regions suddenly break and disappear when the flow rate changes. Flow instability is induced by a sudden change of flow states. These phenomena are characteristic of the fluid showing the flow-induced structure change, whereas ordinary polymer solution do not exhibit such behavior.","PeriodicalId":17434,"journal":{"name":"Journal of the Society of Rheology, Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84152016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Application Feelings of Skin Care Products and Their Rheological Properties 护肤品的使用感受及其流变性能

Journal of the Society of Rheology, Japan Pub Date : 2006-01-01 DOI: 10.1678/RHEOLOGY.34.171

Y. Akiyama, Y. Tsuruda, S. Takeda, Y. Izumi, S. Nishijima

引用次数: 7

Rheological Measurements of Solder Pastes in Heating Processes 焊接膏在加热过程中的流变性测量

Journal of the Society of Rheology, Japan Pub Date : 2006-01-01 DOI: 10.1678/RHEOLOGY.34.301

Toshiaki Yazaki, Y. Otsubo

引用次数: 0

Development of a Rheometer Using Laser Trapping Method and Measurements of Viscosity in Multilayer Coatings 激光俘获法流变仪的研制及多层涂层粘度的测量

Journal of the Society of Rheology, Japan Pub Date : 2006-01-01 DOI: 10.1678/RHEOLOGY.34.71

M. Harada, K. Tachi, Yasuhiko Suzuki, J. Ikeno, S. Umemura

引用次数: 1

Would Waters Shape a Stone into Dreikanter 沃特斯会把石头塑造成德雷坎特吗

Journal of the Society of Rheology, Japan Pub Date : 2006-01-01 DOI: 10.1678/rheology.34.303

O. Kamigaito

引用次数: 0

Study on Polymer Melt Rheology Control and Polymer Processability 聚合物熔体流变控制与聚合物加工性研究

Journal of the Society of Rheology, Japan Pub Date : 2006-01-01 DOI: 10.1678/RHEOLOGY.34.267

K. Koyama

{"title":"Study on Polymer Melt Rheology Control and Polymer Processability","authors":"K. Koyama","doi":"10.1678/RHEOLOGY.34.267","DOIUrl":"https://doi.org/10.1678/RHEOLOGY.34.267","url":null,"abstract":"Various polymer materials have been developed in accordance with requirements for high functional and high performance products in recent years. These polymer materials become useful end products through polymer processing. Linear viscoelastic rheology and non-linear rheology are dominant factors for good polymer processing. Non-linear rheology is mainly studied on several polymer melt systems by newly developed rheometers and new characterization methods in the present study. The newly developed rheometers are applied to the flow induced crystallization study and flow induced structural formation experiments in elongational flow as well as shear flow. The control methods of the non-linear rheology are proposed by molecular structure design, meso-structure design, and external field control. The degree of non-linearity, or the degree of strain hardening, of elongational viscosity can be controlled by a small amount of high molecular weight polymer, by an introduction of long chain branching, and by an addition of small particles or small solid fibers. Rheology control methods are applied to the processability of polymer processing such as high speed fiber spinning, foam processing of PP, poly(L-lactic acid) and rice, and blow molding. The new polymer processing CAE system is developed by the use of flow induced crystallization and non-linear rheology of elongational viscosity.","PeriodicalId":17434,"journal":{"name":"Journal of the Society of Rheology, Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77983439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Molecular Simulations for Entangled Polymer Dynamics 纠缠聚合物动力学的分子模拟

Journal of the Society of Rheology, Japan Pub Date : 2006-01-01 DOI: 10.1678/RHEOLOGY.34.275

Y. Masubuchi

{"title":"Molecular Simulations for Entangled Polymer Dynamics","authors":"Y. Masubuchi","doi":"10.1678/RHEOLOGY.34.275","DOIUrl":"https://doi.org/10.1678/RHEOLOGY.34.275","url":null,"abstract":"A novel method for multi-body molecular simulations for entangled polymers including branch polymers, polymer blends and copolymers is developed in this study. Entangled polymer dynamics is important in industry and still challengeable in polymer science due to complicated rheology caused by a broad variety of controllable polymer architectures such as molecular weight, molecular weight distribution, long chain branching, copolymerization, etc. and freedom of their blends. Conventional molecular simulations are inadequate to the polymer dynamics in long time range because of huge calculation cost. Theoretical approaches based on reptation theories are essentially difficult for multi-component situations due to the self-consistent treatment of entanglement among many chains. In this study a new method of molecular simulations for entangled polymer dynamics is developed based on the primitive chain network model where polymers are considered as primitive chains forming real network in 3D space similarly to the conventional molecular simulations and distinguishably from other entanglement based models. Reasonable consistency on established scaling behaviors for static and dynamic properties and quantitative agreement with experiments for linear and nonlinear rheology have been confirmed for linear and branched polymers. For copolymers and blends reasonable results have been obtained on phase behaviors.","PeriodicalId":17434,"journal":{"name":"Journal of the Society of Rheology, Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82285207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Prediction of Flow Distribution for Bingham Fluid in a Slot Die 宾汉流体在槽型模具中的流动分布预测

Journal of the Society of Rheology, Japan Pub Date : 2006-01-01 DOI: 10.1678/RHEOLOGY.34.205

Masayuki Nagashima, T. Hasegawa, T. Narumi

引用次数: 1

Rheology in Film Processing (2)-Flow Instabilities in Film Casting Process- 薄膜加工中的流变学(2)-薄膜铸造过程中的流动不稳定性

Journal of the Society of Rheology, Japan Pub Date : 2006-01-01 DOI: 10.1678/RHEOLOGY.34.3

H. Ishihara, M. Shibaya, Kosuke Ikeda

{"title":"Rheology in Film Processing (2)-Flow Instabilities in Film Casting Process-","authors":"H. Ishihara, M. Shibaya, Kosuke Ikeda","doi":"10.1678/RHEOLOGY.34.3","DOIUrl":"https://doi.org/10.1678/RHEOLOGY.34.3","url":null,"abstract":"Film casting is one of the important processes for obtaining the plastic film products. Molten polymer casting is conducted by cooling the extruded melts at the surface of chill roller laid below the extrusion dies. Flow instabilities in the film casting are divided into two categories. One is the shear flow instability and the other is the extensional flow instability. These instabilities are similar to those appearing in the melt spinning process. Among many parameters governing shear flow instability, shear rate and Deborah number defined as the ratio of polymer relaxation time to retention time in the land of dies or spinneret orifice are likely to be most important. The small value of Deborah number is found to be effective for depressing the shear flow instability. Regarding the extensional flow instability, draw resonance phenomena were summarized and discussed. Polymer parameters such as power low index in the power low fluid model and relaxation time in Maxwell fluid model were found to be important for onset of draw resonance instability. As process parameters, cooling effect of extruded melts, draft ratio defined as elongation ratio of melts and air gap length corresponding the distance from dies exit to chill roller were also important. Further study on transient response of disturbances having various frequencies was done. It was found that film thickness uniformity changed depending on disturbance frequency.","PeriodicalId":17434,"journal":{"name":"Journal of the Society of Rheology, Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2006-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89167882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Flow Behavior of Bingham Fluid in a Slot Die 宾汉流体在槽型模具中的流动特性

Journal of the Society of Rheology, Japan Pub Date : 2006-01-01 DOI: 10.1678/RHEOLOGY.34.91

Masayuki Nagashima, T. Hasegawa, T. Narumi

引用次数: 2