Korea-Australia Rheology Journal最新文献_第6页

Temperature-dependent rheological behavior of cathode slurry for lithium-ion battery under steady and dynamic tests 锂离子电池正极浆料在稳态和动态试验下的温度依赖性流变行为

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-07-11 DOI: 10.1007/s13367-023-00064-z

Bin Zhao, Deshun Yin, Yunfei Gao, Jiangtao Ren

{"title":"Temperature-dependent rheological behavior of cathode slurry for lithium-ion battery under steady and dynamic tests","authors":"Bin Zhao, Deshun Yin, Yunfei Gao, Jiangtao Ren","doi":"10.1007/s13367-023-00064-z","DOIUrl":"10.1007/s13367-023-00064-z","url":null,"abstract":"<div><p>The rheological property of cathode slurry is commonly influenced by coating speed and mixing temperature, thereby leading to its storage stability and coating uniformity. In this study, the effect of the temperature of slurry on the rheological behaviors is investigated under various shear rates and temperatures based on steady and dynamic tests as well as theoretical models. In the flow experiments, the thixotropic behavior of the slurry is observed at all temperatures tested, and it is reduced with the increase in temperature. The experimental data is captured well by rheological models, and the model parameters are evaluated under the combined effects of shearing and temperature, resulting in two generalized state equations for the description of the flow properties of the slurry. In addition, microstructural rearrangement and polymeric entanglement at high temperatures cause viscosity and modulus to change, giving rise to complex rheological behavior in creep and oscillatory shear. Compared with slurry at 25 and 40 °C, both storage and loss moduli are dependent on oscillatory strain in the range of 0.1–1000% at 65 °C. The difference in characteristic strain corresponding to yielding and strain stiffening behavior is only observed at high temperatures, whereas relaxation times were independent of temperature in the oscillatory shear test. Understanding the effect of the temperature of slurry on rheological behaviors will be useful for improving the manufacturing efficiency of electrodes.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"35 3","pages":"191 - 201"},"PeriodicalIF":1.3,"publicationDate":"2023-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6713750","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

Combined effect of hybrid carbon fillers on the physical and rheological properties of polyvinylidene fluoride composites 杂化碳填料对聚偏氟乙烯复合材料物理流变性能的综合影响

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-07-08 DOI: 10.1007/s13367-023-00062-1

Wonjun Kim, Yuna Oh, Jong-Young Jeon, Bong-Seob Shin, Youngho Eom, Dong Wook Chae

{"title":"Combined effect of hybrid carbon fillers on the physical and rheological properties of polyvinylidene fluoride composites","authors":"Wonjun Kim, Yuna Oh, Jong-Young Jeon, Bong-Seob Shin, Youngho Eom, Dong Wook Chae","doi":"10.1007/s13367-023-00062-1","DOIUrl":"10.1007/s13367-023-00062-1","url":null,"abstract":"<div><p>Three different types of carbon materials [carbon nanotubes (CNTs), carbon black (CB), and carbon fibers (CFs)] were incorporated into polyvinylidene fluoride (PVDF) as single fillers or hybrid fillers (CNT/CB and CNT/CF) via solution blending. The physical properties of the hybrid filler systems such as the electrical, thermal, morphological, and rheological properties were compared to those of the single filler systems. Images of the PVDF composites containing hybrid fillers obtained by a field-emission scanning electron microscope showed that CB appeared to be embedded between highly entangled nanotubes, promoting their debundling in the PVDF matrix. The hybrid filler systems of CB and CF with 0.5 wt% nanotubes were electrically conductive from the corresponding content of 1 wt%, showing maximum values from 5 wt% CB and 10 wt% CF. In the hybrid filler systems, the extent of the increase in crystallization temperature (Tc) in the presence of CB or CF was more prominent at a lower CNT content of 0.5 wt%. In the hybrid systems of CB with 0.5 wt% nanotubes, the melting peak for the β phase was generated from 1 wt% CB and its intensity increased with CB content. On the contrary, the hybrid filler systems of CF with nanotubes did not provide a new peak. Regarding the rheological properties, the complex viscosity (<i>η</i>*) of PVDF/CNT0.5/CB increased with CB content, a pattern similar to that of the single filler system of CB. On the contrary, the presence of CF with 0.5 wt% nanotubes slightly increased <i>η</i>* with CF content, while that with 1 wt% nanotubes notably increased <i>η</i>*, exhibiting a sharp increase at 10 wt%.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"35 3","pages":"137 - 155"},"PeriodicalIF":1.3,"publicationDate":"2023-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6713803","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

Effect of electro-osmosis on lubrication of fresh cement paste-based material in contact with a metal wall 电渗透对接触金属壁的新鲜水泥浆基材料润滑的影响

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-07-03 DOI: 10.1007/s13367-023-00063-0

Viet Hai Hoang, Tu Anh Do, Anh Tuan Tran, Christophe Lanos, Yannick Mélinge

引用次数: 0

Surface characteristics of metal-like composites fabricated with aliphatic polyketone 脂肪族聚酮制备的类金属复合材料的表面特性

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-06-27 DOI: 10.1007/s13367-023-00061-2

Ji Won Jeong, Young Seok Song

引用次数: 0

Thixotropic behavior and particulate aggregation in a suspension of carbon nanotubes 碳纳米管悬浮液中的触变行为和微粒聚集

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-06-14 DOI: 10.1007/s13367-023-00060-3

Daeun Lee, Sangkyun Koo

{"title":"Thixotropic behavior and particulate aggregation in a suspension of carbon nanotubes","authors":"Daeun Lee, Sangkyun Koo","doi":"10.1007/s13367-023-00060-3","DOIUrl":"10.1007/s13367-023-00060-3","url":null,"abstract":"<div><p>The present study dealt with the evaluation of the particulate aggregation in a suspension of multi-walled carbon nanotubes using fractal theory and rheological properties including thixotropy. The multi-walled carbon nanotubes are dispersed in Newtonian glycerol in the concentration range between 0.2 and 0.45 wt%. Rheological measurement was performed for the suspension at various dispersion times up to 300 min. The suspension showed thixotropy, shear-thinning behavior, and yield stress. It also exhibited plateaus of storage modulus in frequency and strain sweep tests. As the dispersion time increases, thixotropy, low-shear viscosities, and yield stress increase, and then their increasing rates slow down. Suspension’s electrical conductivity also showed similar behavior as that of thixotropy with the dispersion time. Viscoelastic behavior was combined with a fractal concept to provide the fractal dimensions of the flocs in the suspension at various dispersion times. The fractal dimension tends to decrease with the dispersion time. Conclusively it is interpreted that as the dispersion proceeds flocs become smaller and chain-like, then the reduced and thinned flocs build the wider range of network structures at rest state.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"35 3","pages":"127 - 135"},"PeriodicalIF":1.3,"publicationDate":"2023-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13367-023-00060-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6713690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanical degradation of poly(ethylene terephthalate) and its structural modification by chain extender 聚对苯二甲酸乙酯的机械降解及其扩链剂的结构改性

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-05-30 DOI: 10.1007/s13367-023-00059-w

Samuel Muobom Saabome, Jae Eun Lee, Joung Sook Hong, Dong Hak Kim, Kyung Hyun Ahn

{"title":"Mechanical degradation of poly(ethylene terephthalate) and its structural modification by chain extender","authors":"Samuel Muobom Saabome, Jae Eun Lee, Joung Sook Hong, Dong Hak Kim, Kyung Hyun Ahn","doi":"10.1007/s13367-023-00059-w","DOIUrl":"10.1007/s13367-023-00059-w","url":null,"abstract":"<div><p>Characterized by high strength to unit weight, poly(ethylene terephthalate) (PET) remains one of the most widely used engineering plastics, hence the attention to its associated waste and recycling technology development has been paid from academic and industrial perspectives. Herein, we investigate the mechanical degradation of PET through degradative compounding process cycles and the effect of chain extender (Joncryl<sup>®</sup> ADR 4468) to prevent molecular degradation of PET during melt processing. They are characterized based on rheological and mechanical measurements. Characterization of the bottle-grade PET samples reveals low viscosity and crystallinity owing to isophthalic acid units within the PET copolymer structure over PET homopolymer. Mechanical shear and thermal impact by virtue of the increase in rotor speed and temperature are employed to study the degradation of the PET samples. Both samples respond to degradation in successive processing cycles with as much as 70% decrease in their complex viscosity and moduli. The molecular weight of PET copolymer accordingly decreases from 23,400 to 8010 g/mol. Chain scission arising from thermo-mechanical degradation results in high crystallinity by more than five folds in the processed PETs. Attributed to recoupling of the degraded short chains, the chain extender compensates with the increase in viscosity and moduli up to 20% whilst serving to increase crystallinity but almost ineffective in appreciating mechanical performance with barely any significant variation in tensile strength and elongation at break. This study shows that mechanical shear is verified to impact a pronounced degradation on PET more than thermal action on the samples.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"35 3","pages":"203 - 212"},"PeriodicalIF":1.3,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13367-023-00059-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"6713689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tuning the microstructure and rheological properties of MXene-polymer composite ink by interaction control 通过相互作用调控mxene -聚合物复合油墨的微观结构和流变性能

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-05-10 DOI: 10.1007/s13367-023-00058-x

Yeeun Kim, Eunji Kim, Dohoon Kim, Chi Won Ahn, Byoung Soo Kim, Kyung Hyun Ahn, Yonghee Lee, Jun Dong Park

{"title":"Tuning the microstructure and rheological properties of MXene-polymer composite ink by interaction control","authors":"Yeeun Kim, Eunji Kim, Dohoon Kim, Chi Won Ahn, Byoung Soo Kim, Kyung Hyun Ahn, Yonghee Lee, Jun Dong Park","doi":"10.1007/s13367-023-00058-x","DOIUrl":"10.1007/s13367-023-00058-x","url":null,"abstract":"<div><p>Since the discovery of MXene, which has been attracting attention as an alluring two-dimensional material with a distinct structure and mechanical and electrical capabilities, numerous attempts have been made to combine MXene with polymer additives to enhance and compensate for MXene’s inherent weakness. In this work, the rheological properties of MXene (Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>)-polymer composite inks of three different polymers with various interaction with MXene particles are examined. Polyethylene glycol (PEG), which is known to physically adsorb on the surface of MXene, improved MXene dispersion while enhancing the viscoelastic property of ink. MXene ink containing polyethylenimine (PEI) was destabilized forming a viscoelastic network structure as PEI of strong positive charge adsorbed on the MXene surface to neutralize negative charge and diminish electrostatic repulsion. In the case of MXene-polyacrylic acid (PAA) composite ink, the formation of hydrogen bonds between MXene and PAA resulted in a dense network structure with high viscoelasticity. In terms of rheological property sensitivity to concentration, MXene ink without polymer additives exhibited power-law behavior with the largest exponent, whereas MXene-polymer composite inks indicated moderate sensitivity. Our findings will aid in the design of MXene-based composites with optimum rheological properties for specific processes such as 3D printing and coating.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"35 2","pages":"117 - 125"},"PeriodicalIF":1.3,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4428480","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

Influence of cationic polymer on the floccule size of cement pastes containing polycarboxylate superplasticizer and Na-bentonite 阳离子聚合物对含聚羧酸盐高效减水剂和钠基膨润土水泥浆体絮凝体尺寸的影响

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-04-27 DOI: 10.1007/s13367-023-00057-y

Pengpeng Wen, Zhongjun Feng, Baicun Zheng

{"title":"Influence of cationic polymer on the floccule size of cement pastes containing polycarboxylate superplasticizer and Na-bentonite","authors":"Pengpeng Wen, Zhongjun Feng, Baicun Zheng","doi":"10.1007/s13367-023-00057-y","DOIUrl":"10.1007/s13367-023-00057-y","url":null,"abstract":"<div><p>Influence of cationic polymer (KN) on the floccule size of cement pastes containing plycarboxylate superplasticizer (PCE) and Na-bentonite was studied. The proportion of floccule size and grain size <span>({d}_{f}/{d}_{g})</span> was obtained from a rheological analysis with the application of Herschel–Bulkley model and modified Krieger–Dougherty model. Herschel–Bulkley model was used to gain the yield stress according to our previous study. Cement pastes were investigated both at the beginning and after one hour. The results showed that a high value of <span>({d}_{f}/{d}_{g})</span> was noticed under low shear rate range and then the proportion decreased with the increase of shear rate. For cement paste containing PCE and Na-bentonite in the absence of KN, larger floccule was formed due to the intercalation of polyethylene glycol branch chain of PCE into the interlayer space of Na-bentonite. However, the floccule size of cement pastes obviously decreased with the increasing addition amount of KN. Thus, KN will restrain the formation of floccules in cement pastes containing PCE and Na-bentonite to a certain extent.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"35 2","pages":"105 - 116"},"PeriodicalIF":1.3,"publicationDate":"2023-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13367-023-00057-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5030024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electric and magnetic field-responsive suspension rheology of core/shell-shaped iron oxide/polyindole microspheres 核/壳型氧化铁/聚吲哚微球的电场和磁场响应悬浮流变学

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-04-08 DOI: 10.1007/s13367-023-00056-z

Cheng Hai Hong, Hyo Seon Jang, Seok Jun Oh, Li-hai Fu, Hyoung Jin Choi

{"title":"Electric and magnetic field-responsive suspension rheology of core/shell-shaped iron oxide/polyindole microspheres","authors":"Cheng Hai Hong, Hyo Seon Jang, Seok Jun Oh, Li-hai Fu, Hyoung Jin Choi","doi":"10.1007/s13367-023-00056-z","DOIUrl":"10.1007/s13367-023-00056-z","url":null,"abstract":"<div><p>In this study, conductive polyindole (PIn) was coated onto initially fabricated magnetic iron oxide (Fe<sub>3</sub>O<sub>4</sub>) particles via chemical oxidative polymerization, and the synthesized core–shell structured hybrid smart particles were used as smart electrorheological/magnetorheological (EMR) materials. The synthesized Fe<sub>3</sub>O<sub>4</sub>/PIn particles were characterized using scanning electron microscopy and transmission electron microscopy. In addition, the chemical composition of the synthesized particles was confirmed using Fourier-transform infrared spectroscopy. Their magnetic properties were further analyzed using VSM. Consequently, the Fe<sub>3</sub>O<sub>4</sub>/PIn particle-based suspension, which was both magnetic and conductive, was found to exhibit interesting dual stimuli under both external electric and magnetic fields. Various rheological measurements, including shear simple steady shear and dynamic tests, were employed to evaluate the behavior of typical EMR suspensions. Furthermore, the dielectric properties of the particles were analyzed using an LCR meter. Based on the dielectric spectrum data, the relaxation time (<i>λ</i>) was estimated to be 1.5 × 10<sup>–8</sup> s at the maximum frequency (<i>λ</i> = 1/2πfmax). Measurements conducted using a Turbiscan indicated enhanced sedimentation stability of the particles owing to a decrease in the particle density from 4.34 to 2.93 g/cm<sup>3</sup>.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"35 2","pages":"95 - 103"},"PeriodicalIF":1.3,"publicationDate":"2023-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13367-023-00056-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4324125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Linear viscoelasticity of covalent adaptable network (CAN) polymers comprising β-amino esters 含有β-氨基酯的共价自适应网络(CAN)聚合物的线性粘弹性

IF 1.3 4区工程技术

Korea-Australia Rheology Journal Pub Date : 2023-03-22 DOI: 10.1007/s13367-023-00054-1

Hyeong Yong Song, Gyuri Lee, Suk-kyun Ahn, Kyu Hyun

{"title":"Linear viscoelasticity of covalent adaptable network (CAN) polymers comprising β-amino esters","authors":"Hyeong Yong Song, Gyuri Lee, Suk-kyun Ahn, Kyu Hyun","doi":"10.1007/s13367-023-00054-1","DOIUrl":"10.1007/s13367-023-00054-1","url":null,"abstract":"<div><p>We present an experimental investigation of the linear viscoelasticity for a series of covalent adaptable network (CAN) polymers of <i>β</i>-amino esters possessing tertiary amines at the <i>β</i> position of ester linkages. CAN polymers were synthesized by aza-Michael addition from di-acrylate monomers with or without <i>β</i>-hydroxyl groups using a tri-amine cross-linker. The prepared CAN polymers exhibited dissociative-type bond exchanges by aza-Michael reaction. The additional inclusion of <i>β</i>-hydroxyl group endowed them with associative-type bond exchanges by transesterification. Time–temperature superposition (TTS) was used to construct pseudo-master curves of storage, loss, and stress-relaxation moduli over wide timescales. The results showed that without transesterification, the slow kinetics of aza-Michael reaction considerably retarded terminal relaxation. The introduction of transesterification accelerated terminal relaxation rates but did not modify the overall broadness of terminal relaxation modes. Horizontal shift factors displayed Williams–Landel–Ferry (WLF) dependence below 120 °C but Arrhenius dependence above 120 °C. The former was due to slow segmental dynamics, whereas the latter reflected the characteristic of exchange reaction kinetics. In addition, we also compared and discussed two definitions of topology freezing transition temperature, an important concept for associative-type CANs. Conclusively, the topology freezing transition temperature obtained from the transition of shift factors (WLF → Arrhenius) was a more practical definition for the potential processing and applications of CAN polymers.</p></div>","PeriodicalId":683,"journal":{"name":"Korea-Australia Rheology Journal","volume":"35 2","pages":"69 - 79"},"PeriodicalIF":1.3,"publicationDate":"2023-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s13367-023-00054-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4867280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0