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Nihon Reoroji Gakkaishi最新文献

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Velocity Jump of Crack Propagation in Viscoelastic Solids 粘弹性固体中裂纹扩展的速度跳跃
IF 1.3 4区 工程技术
Nihon Reoroji Gakkaishi Pub Date : 2022-02-15 DOI: 10.1678/rheology.50.99
N. Sakumichi
{"title":"Velocity Jump of Crack Propagation in Viscoelastic Solids","authors":"N. Sakumichi","doi":"10.1678/rheology.50.99","DOIUrl":"https://doi.org/10.1678/rheology.50.99","url":null,"abstract":"A crack in a viscoelastic solid exhibits velocity jump, i.e., the propagation velocity changes abruptly in a narrow range of the applied load. However, the mechanism had been unsolved until recently. This review introduces past findings on velocity jumps in viscoelastic solids, focusing on our studies. We have developed an exactly solvable model that exhibits the velocity jump. From the mathematical solution, we have elucidated that the velocity jump is caused by a dynamic glass transition in the vicinity of the crack tip. Also, we have provided a guiding principle for toughening viscoelastic solids. Recently, the predictions of the model have been confirmed by experiments and numerical simulations.","PeriodicalId":19282,"journal":{"name":"Nihon Reoroji Gakkaishi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48024106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Molecular Understanding of Viscoelasticity in Transient Polymer Networks Based on Multiple Methods 基于多种方法的瞬态聚合物网络粘弹性分子理解
IF 1.3 4区 工程技术
Nihon Reoroji Gakkaishi Pub Date : 2022-02-15 DOI: 10.1678/rheology.50.51
T. Katashima
{"title":"Molecular Understanding of Viscoelasticity in Transient Polymer Networks Based on Multiple Methods","authors":"T. Katashima","doi":"10.1678/rheology.50.51","DOIUrl":"https://doi.org/10.1678/rheology.50.51","url":null,"abstract":"Transient polymer networks are formed by dynamic crosslinks with a finite lifetime and therefore exhibit significant viscoelasticity, including non-Newtonian behaviors. Using the combination of multiple experimental techniques, such as viscoelastic measurements and spectroscopic analyses, these properties can be understood at the molecular level. This review classified transient polymer networks as side-chain and end-chain crosslinks, and viscoelastic studies of each type were presented. A combination of linear viscoelastic and spectroscopic methods revealed deviations between the viscoelastic properties of transient polymer networks and the molecular model. These deviations are sometimes attributed to dynamic heterogeneities potentially contained in the transient polymer network. These unexpected heterogeneous structures are challenging to control and impact viscoelasticity. Controlling and discussing these heterogeneities based on multiple experimental approaches is essential for a better molecular understanding of transient networks in the future.","PeriodicalId":19282,"journal":{"name":"Nihon Reoroji Gakkaishi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42081735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Nonlinear Shear and Elongational Rheology of Poly(propylene carbonate) 聚碳酸酯的非线性剪切和伸长流变学研究
IF 1.3 4区 工程技术
Nihon Reoroji Gakkaishi Pub Date : 2022-02-15 DOI: 10.1678/rheology.50.127
Lixin Yang, Takashi Uneyama, Y. Masubuchi, Y. Doi
{"title":"Nonlinear Shear and Elongational Rheology of Poly(propylene carbonate)","authors":"Lixin Yang, Takashi Uneyama, Y. Masubuchi, Y. Doi","doi":"10.1678/rheology.50.127","DOIUrl":"https://doi.org/10.1678/rheology.50.127","url":null,"abstract":"Nonlinear shear and elongational rheology of entangled poly(propylene carbonate) (PPC) melts having different molecular weights with relatively narrow molecular weight distribution are examined. In shear measurements, the PPCs exhibit a typical shear thinning behavior with stress overshoot at high shear rates. In the shear rate dependence of the steady-state viscosity, the PPCs do not violate the empirical Cox-Merz rule, which is known to be valid for many other entangled polymer melts. In uniaxial elongational measurements, the viscosity growth functions of the PPCs show a weak deviation from the linear viscoelastic (LVE) envelope to the higher side at the high Weissenberg number Wi d (= ͘ετ d , where ͘ε is the elongation rate and τ d is the characteristic disengagement time). The steady-state viscosity of the PPCs shows an elongational thinning as a function of ͘ε \u0003−0.5 within an error. These results are similar to some other polymer melts such as polystyrene (PS). In addition, the normalized elongational viscosity growth functions of PPC and PS with a similar entanglement number Z , are compared. The PPC exhibits a similar viscosity growth curve to the PS at the same Wi d . This result suggests that the degree of the monomeric friction reduction originated from the stretch/orientation of PPC under fast elongational flow\u0003might\u0003occur\u0003at\u0003the\u0003same\u0003level\u0003as\u0003PS.","PeriodicalId":19282,"journal":{"name":"Nihon Reoroji Gakkaishi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46434258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Rheological Properties of Nanocellulose Dispersions in the Dilute Region: Current Understanding and Future Perspectives 纳米纤维素分散体在稀相区的流变特性：目前的理解和未来的展望
IF 1.3 4区 工程技术
Nihon Reoroji Gakkaishi Pub Date : 2022-02-15 DOI: 10.1678/rheology.50.73
Reina Tanaka
{"title":"Rheological Properties of Nanocellulose Dispersions in the Dilute Region: Current Understanding and Future Perspectives","authors":"Reina Tanaka","doi":"10.1678/rheology.50.73","DOIUrl":"https://doi.org/10.1678/rheology.50.73","url":null,"abstract":"","PeriodicalId":19282,"journal":{"name":"Nihon Reoroji Gakkaishi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44922961","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Self-Assembly Behaviors and Flow Properties of Amphiphiles by Mesoscale Simulations with Hydrodynamic Interactions 含水动力相互作用的两亲体自组装行为和流动特性中尺度模拟
IF 1.3 4区 工程技术
Nihon Reoroji Gakkaishi Pub Date : 2022-02-15 DOI: 10.1678/rheology.50.31
Yusei Kobayashi
{"title":"Self-Assembly Behaviors and Flow Properties of Amphiphiles by Mesoscale Simulations with Hydrodynamic Interactions","authors":"Yusei Kobayashi","doi":"10.1678/rheology.50.31","DOIUrl":"https://doi.org/10.1678/rheology.50.31","url":null,"abstract":"","PeriodicalId":19282,"journal":{"name":"Nihon Reoroji Gakkaishi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42942038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fracture and Toughening Mechanisms of Glassy Polymer at the Molecular Level 玻璃聚合物的分子水平断裂与增韧机制
IF 1.3 4区 工程技术
Nihon Reoroji Gakkaishi Pub Date : 2022-02-15 DOI: 10.1678/rheology.50.37
K. Fujimoto
{"title":"Fracture and Toughening Mechanisms of Glassy Polymer at the Molecular Level","authors":"K. Fujimoto","doi":"10.1678/rheology.50.37","DOIUrl":"https://doi.org/10.1678/rheology.50.37","url":null,"abstract":"Fracture is one of the most important topics in the polymer field. Accordingly, many insightful works about polymer fracture have been reported since the 1960s. This topical review considers polymer fracture studies of experiments, theoretical models, and simulations. These past studies have discussed craze initiation criteria, yielding mechanisms, and differences in the fracture of different chemical species. New insight into polymer fracture based on large-scale molecular simulations is also provided.","PeriodicalId":19282,"journal":{"name":"Nihon Reoroji Gakkaishi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46495991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Rheology of Polyelectrolyte Solutions: Current Understanding and Perspectives 聚电解质溶液的流变学：当前的理解和展望
IF 1.3 4区 工程技术
Nihon Reoroji Gakkaishi Pub Date : 2022-02-15 DOI: 10.1678/rheology.50.43
A. Matsumoto
{"title":"Rheology of Polyelectrolyte Solutions: Current Understanding and Perspectives","authors":"A. Matsumoto","doi":"10.1678/rheology.50.43","DOIUrl":"https://doi.org/10.1678/rheology.50.43","url":null,"abstract":"Polyelectrolytes with ionic groups are abundant in nature and essential in life. Counterions can be released into a solution and leave charges on polyelectrolyte chains, making the solution properties significantly different from those of electrically neutral polymers. A lot of scientific efforts have been made to elucidate the effect of electrostatic interactions on the conformation and material properties of polyelectrolyte solutions. However, unfortunately, our understanding is still far away from being perfect, and continuous efforts need to be provided by researchers from different aspects. This short review will highlight the research progress made in the past few years on the conformation and viscoelastic properties of polyelectrolyte solutions.","PeriodicalId":19282,"journal":{"name":"Nihon Reoroji Gakkaishi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45581481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Rheological Properties of Ring Polymers and Their Derivatives 环状聚合物及其衍生物的流变性能
IF 1.3 4区 工程技术
Nihon Reoroji Gakkaishi Pub Date : 2022-02-15 DOI: 10.1678/rheology.50.57
Y. Doi
{"title":"Rheological Properties of Ring Polymers and Their Derivatives","authors":"Y. Doi","doi":"10.1678/rheology.50.57","DOIUrl":"https://doi.org/10.1678/rheology.50.57","url":null,"abstract":"Ring polymers are one of the model polymers to understand the relationship between molecular architecture and the dynamics of polymers. This review summarizes the recent rheological studies on pure ring polymers, ring/linear polymer blends, and ring polymer derivatives. Pure ring polymers exhibit different linear and nonlinear rheological properties from linear polymers owing to the absence of chain ends. The presence of linear chains in ring polymers sensitively influences the rheological properties due to the occurrence of spontaneous intermolecular ring/linear threading. This effect becomes significant when a ring and linear chains are connected in a molecule for tadpole-shaped and dumbbell-shaped polymers.","PeriodicalId":19282,"journal":{"name":"Nihon Reoroji Gakkaishi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41705061","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Nonlinear Rheology in Dense Suspensions 致密悬浮液中的非线性流变学
IF 1.3 4区 工程技术
Nihon Reoroji Gakkaishi Pub Date : 2022-02-15 DOI: 10.1678/rheology.50.63
T. Kawasaki
{"title":"Nonlinear Rheology in Dense Suspensions","authors":"T. Kawasaki","doi":"10.1678/rheology.50.63","DOIUrl":"https://doi.org/10.1678/rheology.50.63","url":null,"abstract":"","PeriodicalId":19282,"journal":{"name":"Nihon Reoroji Gakkaishi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41633508","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
日本レオロジー学会誌50巻記念総説特集号にむけて 日本ー学会志50卷纪念综述特集号向
IF 1.3 4区 工程技术
Nihon Reoroji Gakkaishi Pub Date : 2022-02-15 DOI: 10.1678/rheology.50.1
雄一 増渕
{"title":"日本レオロジー学会誌50巻記念総説特集号にむけて","authors":"雄一 増渕","doi":"10.1678/rheology.50.1","DOIUrl":"https://doi.org/10.1678/rheology.50.1","url":null,"abstract":"","PeriodicalId":19282,"journal":{"name":"Nihon Reoroji Gakkaishi","volume":" ","pages":""},"PeriodicalIF":1.3,"publicationDate":"2022-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42844291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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