scholarly journals Rheological behavior of castor oil mixed with different pyromellitic esters

2014 ◽  
Vol 79 (2) ◽  
pp. 241-251 ◽  
Author(s):  
Sorina Boran ◽  
Andra Tamas
Keyword(s):  
Rheological Behavior ◽  
Castor Oil ◽  
Aliphatic Alcohol ◽  
Alkyl Aryl ◽  
Flow Activation Energy ◽  
Behavior Study ◽  
Flow Activation ◽  
Pyromellitic Anhydride ◽  
Newtonian Behavior

The paper presents the rheological behavior study of castor oil mixed with different pyromellitic esters. The pyromellitic tetraesters used were obtained through the esterification of pyromellitic anhydride with a special alcohol of a complex alkyl-aryl structure (2-phenoxy-ethanol) in conjunction with a linear aliphatic alcohol with variable length (n-butanol, n-decanol). The influence of pyromellitic esters? structure and concentration was determined, as well as that of temperature, on the rheological behavior, by setting the dependence between the shear stress ? and the shear rate ?. The analysis of dependence between ? and ? demonstrates that the studied solutions have Newtonian behavior. The evolution of samples' viscosity with temperature was characterized by Arrhenius type equations, being established the values of viscous flow activation energy, Ea. This constant can be correlated with the effect of reducing friction in the presence of additives. It was also realized a characterization of annulus fluids flow under the effect of rotational motion, calculating the values of Taylor-Reynolds number (TaRe).

Flow Behavior of Heterocyclic Aramid Concentrated Solution

2010 ◽  
Vol 146-147 ◽  
pp. 470-474
Author(s):  
Lei Chen ◽  
Zu Ming Hu ◽  
Bao Shan Gao ◽  
Guo Ping Tang ◽  
Jun Rong Yu ◽  
...  
Keyword(s):  
Activation Energy ◽  
Molecular Weight ◽  
Flow Behavior ◽  
Viscosity Index ◽  
Solution Concentration ◽  
Structural Viscosity ◽  
Flow Activation Energy ◽  
Flow Activation ◽  
Concentrated Solution ◽  
Newtonian Behavior

By means of HAAKE RS105L cone and plate rheometer the rheological behavior of heterocyclic aramid concentrated solution, including viscous flow activation energy, non-Newtonian index, structural viscosity index of the heterocyclic aramid solution were studied. The effect of concentration and temperature of the solution and molecular weight of the polymer on its non-Newtonian behavior was investigated. The results showed that heterocyclic aramid concentrated solution prepared via low temperature condensation was non-Newtonian fluid. With the decrease of temperature, increase of solution concentration and heterocyclic aramid molecular weight, the deviation of the solution from Newtonian behavior decreased. The molecular weight of the polymer and the concentration of the solution affected the non-Newtonian behavior more intensively.

Rheological Behavior of Blend Spinning Solution of Sodium Alginate and Carbon Black

2011 ◽  
Vol 332-334 ◽  
pp. 268-274
Author(s):  
Li Wen Tan ◽  
Quan Ji ◽  
Jian Jun Zhang ◽  
Feng Jun Wang ◽  
Feng Yu Quan ◽  
...  
Keyword(s):  
Carbon Black ◽  
Sodium Alginate ◽  
Rheological Behavior ◽  
Apparent Viscosity ◽  
Viscosity Index ◽  
Flow Activation Energy ◽  
Shear Rates ◽  
Swell Ratio ◽  
Flow Activation ◽  
Large Flow

Rheological properties of blend spinning solution of sodium alginate and carbon black (SA/CB) were investigated. The results reported that blend spinning solutions were non-newtonian fluids. The apparent viscosity and structural viscosity index increased with increasing CB content in SA spinning solution, but the non-newtonian index decreased, both demonstrated the blend solution was sensitive to shear rates. Blend spinning solution with 6% CB had large flow activation energy (Eη), so the temperature must be controlled exactly in spinning. Temperature had similar impact on sample spinning solutions: the apparent viscosity decreased when it increased. Study on dynamic rheological behavior shows SA/CB blend spinning solutions had greater die swell ratio and worse flowability than pure SA solution, but the flowability of blend solutions could be regulated by changing temperature.

Study on the Rheological Behavior of Neat PLA Chips and PLA Composites for Meltblowing Nonwovens

2012 ◽  
Vol 268-270 ◽  
pp. 123-126
Author(s):  
Bin Yu ◽  
Hui Sun ◽  
Jian Han ◽  
Peng Cheng Yu ◽  
Guo Ping Xu
Keyword(s):  
Rheological Behavior ◽  
Complex Viscosity ◽  
Flow Behaviour ◽  
Poly Lactic Acid ◽  
Capillary Rheometer ◽  
Newtonian Flow ◽  
Flow Activation Energy ◽  
Lower Shear ◽  
Lower Shear Rate ◽  
Flow Activation

The PLA/tourmaline composites were prepared by co-extrusion of PLA chips and tourmaline fillers. Rheological behavior of PLA chips and PLA/tourmaline composites were analyzed using a capillary rheometer. Experimental results showed that the rheological curves complex viscosity of the PLA chips exhibited a non-Newtonian flow behaviour. Complex viscosity of the PLA chips decreased with the temperature increasing. A non-Newtonian flow behaviour was observed in all the PLA/tourmaline composites samples at lower shear rate. The complex viscosity of PLA blends increased with the input of tourmaline. The viscous flow activation energy of PLA/tourmaline blend melts decreased compared with that of neat PLA chips. Keyword: Rheological behavior; poly(lactic acid); tourmaline; meltblowing

Analysis of the Rheological Behavior and Stability of Inconel 718 Powder Injection Molding (PIM) Feedstock

2014 ◽  
Vol 879 ◽  
pp. 63-72 ◽  
Author(s):  
Ahmad Nizam bin Abdullah ◽  
Nurhaslina binti Johari ◽  
Muhammad Jabir bin Suleiman Ahmad ◽  
Rosdi Ibrahim ◽  
Abdul Rahim Abu Talib
Keyword(s):  
Activation Energy ◽  
Shear Rate ◽  
Rheological Behavior ◽  
Inconel 718 ◽  
Powder Injection ◽  
Capillary Rheometer ◽  
Binder System ◽  
Flow Activation Energy ◽  
Flow Activation ◽  
Ability Index

In PIM process, the molding stage is a critical step for the fabrication of sound parts without cracks and distortions. So, this step requires specific rheological behavior. Rheological analysis can be made to quantify the stability of the PIM feedstock during molding process. In this study, an experimental rheological study has been performed to evaluate the influence of palm stearin on the rheological behavior and stability of Inconel 718 powder injection molding (PIM) feedstock. The effects of shear rate and temperature were investigated via capillary rheometer method. The viscosity and shear rate of the feedstock were measured at various range of temperature and shear rate across the L/D = 1 capillary rheometer. The results show that the formulation binder system PSPE 7030 is the best feedstock to be injection molded because it has moderate value of flow sensitivity index, lower value for flow activation energy and higher value for mold ability index. Besides that, the increasing of PS content in the binder system has found reduce viscosity and value of flow activation energy and increase value of mold ability index of feedstock.

scholarly journals Synthesis and Characterization of Novel Castor Oil-Based Polyol for Potential Applications in Coatings

2019 ◽  
Vol 7 (1) ◽  
pp. 31-40 ◽  
Author(s):  
Azam Sardari ◽  
Ali Asghar Sabbagh Alvani ◽  
Seyed Reza Ghaffarian
Keyword(s):  
Castor Oil ◽  
Synthesis And Characterization ◽  
Potential Applications

Rheological Study on of PBT with High Melt Flow Index

2012 ◽  
Vol 487 ◽  
pp. 644-648
Author(s):  
Yuan Liu ◽  
Lin Wang ◽  
Qing Yan Xu ◽  
Pei Jie Lin ◽  
Zhi Hong Guo ◽  
...  
Keyword(s):  
Activation Energy ◽  
Shear Rate ◽  
Apparent Viscosity ◽  
Melt Flow Index ◽  
Flow Index ◽  
Melt Flow ◽  
Flow Activation Energy ◽  
Nonwoven Fabrics ◽  
Flow Activation ◽  
High Flexibility

Melt-blown generated PBT nonwoven fabrics usually have small fibril diameter, high flexibility, well heat and oil resistance. Therefore, they would have promising application such as vehicle filtering media. The rheological behavior of PBT with High Melt Flow Index for Melt-blown is investigated in this paper. It is a direction of the technology design and fabrication parameters .The relation of apparent viscosity and shear rate is analyzed, as well as flow activation energy and Non-Newtonian indexes. The results suggest that PBT with High Melt Flow Index is Non-Newtonian fluid. Apparent viscosity and flow activation energy show gradually decrease with increasing shear rate, exhibiting typical shear-thinning behavior.

Effect of Dispersant Addition on Properties of Ceramic Pieces from Kampung Dengir, Besut, Terengganu, Malaysia

2017 ◽  
Vol 888 ◽  
pp. 28-32
Author(s):  
Noor Asliza Ismail Adnen ◽  
Nur Atiqah Azwa Joulme Morad ◽  
Mohd Aidil Adhha Abdullah ◽  
Mohd Al Amin Muhamad Nor
Keyword(s):  
Water Absorption ◽  
Rheological Behavior ◽  
Ceramic Body ◽  
X Ray ◽  
Test Pieces ◽  
Ceramic Slurry ◽  
Sample Characterization ◽  
Ball Clay ◽  
Good Flow

The abundancy of ball clay can be transform into more useful form. This study was conducted to investigate the effect of different amount of dispersant on ceramic system. Ball clay from Kampung Dengir, Besut, Terengganu was used as starting powder while sodium silicate was used as dispersant to produce good flow ability, minimum viscosity and controllable ceramic slurry. Ceramic slurry was prepared by adding additives such as binder, flux, filler and dispersant, casted onto POP mould to obtain ceramic body. Ceramic then cut into test pieces (8cm x 2cm) and mixed for 2 h and aged for 2 days before dried at 70 °C overnight and sintered at temperature of 800-1200 °C in furnace for 2 h with heating rate 5 °C/min. Slurries also tested for rheological properties using rheometer (brand Thermo Haake). Viscosity and shear stress were measured to investigate the rhoelogical behaviour of slip with different amount of dispersant (0.03 mL to 0.06 mL/200 mL of sample). Characterization of raw samples has been done using X-ray diffractometer (XRD) showing the presence of kaolinite and quartz. Effect of dispersant on rheological behavior, rate of shrinkage, water absorption, porosity and density were investigated It was found that increase in amount of dispersant added exhibit the best rheological behavior, and 0.05 mL dispersant was the optimum amount in term of rate of shrinkage, water absorption, porosity and density. As a conclusion, 0.05 mL was the optimum dispersant which gives best rheological behavior and almost fault-free ceramic bodies

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