Rheological Behavior and Extrudate Swell of Polypropylene/Silicon Carbide Composites

2013 ◽  
Vol 747 ◽  
pp. 595-598 ◽  
Author(s):  
Apaipan Rattanapan ◽  
Nuttaphong Sornsuwit ◽  
Rapeephun Dangtungee
Keyword(s):  
Silicon Carbide ◽  
Shear Stress ◽  
Shear Viscosity ◽  
Rheological Behavior ◽  
Sem Analysis ◽  
Elongation Rate ◽  
Capillary Rheometer ◽  
Extrudate Swell ◽  
Elongation Viscosity ◽  
Sic Composites

The rheological behavior and extrudate swell of polypropylene (PP)/silicon carbide (SiC) composites were investigated. Polypropylene-grafted-maleic anhydride (PP-g-MA) was introduced into blending system as a compatibilizer. The effect of silicon carbide loading and surface modification on the rheological behavior of PP/SiC composites were studied using a capillary rheometer and SEM analysis. The results showed that the composites exhibit pseudoplastic behavior as the shear stress and extrudate swell increased with increasing shear rate, while shear viscosity decreased. Moreover, an increasing elongation rate leads to reduce elongation viscosity. The addition of PP-g-MA in PP/SiC composites has significantly decreased the apparent shear stress, apparent shear viscosity and percentage of extrudate swell.

Waste Silicon Carbide as Filler for Natural Rubber Compounds

2014 ◽  
Vol 979 ◽  
pp. 155-158 ◽  
Author(s):  
Apaipan Rattanapan ◽  
Jitrakha Paksamut ◽  
Pornsri Pakeyangkoon ◽  
Surakit Tuampoemsab
Keyword(s):  
Silicon Carbide ◽  
Tensile Strength ◽  
Natural Rubber ◽  
Shear Viscosity ◽  
Tensile Modulus ◽  
Filler Loading ◽  
Extrudate Swell ◽  
Elongation At Break ◽  
Roll Mill ◽  
Cure Time

This work studied possibilities of using waste silicon carbide (SiC) particles from abrasive industry as alternative filler in natural rubber (NR) compounds. The rubber was prepared by using natural rubber grade STR 5L and waste silicon carbide loading of 0, 10, 20, 30 and 40 phr. Firstly, the rubber were compounded by using two roll mill and then using Oscillating Disc Rheometer for studying cure time at one hundred and fifty degree Celsius. Then, shear viscosity and extrudate swell of the compounded natural rubber were characterized by using capillary rheometer at 100°C. The result showed that the apparent shear viscosity increased slightly with increasing waste silicon carbide loading and the percentage of extrudate swell was found to be a decreasing function of the filler loading. Then, test tensile by using the prepared samples for studying tensile modulus, tensile strength and elongation at break. The result showed that tensile modulus and tensile strength increased with increasing waste silicon carbide. On the other hand, the elongation at break of the filled natural rubber decreased with increasing waste silicon carbide. Finally, bring the sample to test hardness by using shore A. Results indicated that waste silicon carbide direct variation with the indicator of hardness.

Rheological Properties and Extrudate Swell of PHBV-Bagasse Composites

2014 ◽  
Vol 931-932 ◽  
pp. 83-89
Author(s):  
Rapeephun Dangtungee ◽  
Suchart Siengchin ◽  
Chayada Puritung
Keyword(s):  
Particle Size ◽  
Shear Stress ◽  
Shear Rate ◽  
Surface Treatment ◽  
Shear Viscosity ◽  
Extrudate Swell ◽  
Melt Mixing ◽  
Capillary Rheometry ◽  
Wide Range ◽  
Twin Screw

Polyhydroxybutylate-co-hydroxyvalerate (PHBV) is biodegradable aliphatic polyester that produced by a wide range of microorganism. In this research aims to study the melt rheological and extrudate swelling behavior of PHBV filled with bagasse. The composites prepared by melt mixing (Two roll mill and Twin screw extruder). The effects of processing techniques for PHBV powder and bagasse loading, aspect ratio (particle size i.e. x<150μm, 150<x<250μm and x>250μm) and, surface treatment of bagasse were investigated by capillary rheometry at 180 °C. The dispersion of the bagasse was inspected by the scanning electron microscopy (SEM). A different compositions based on PHBV/bagasse were investigated according to the following weight ratios, i.e. 100/0, 95/5, 90/10, 80/20 and 70/30 wt% respectively. The results showed that the PHBV/bagasse composites exhibit pseudoplastic behaviour as the shear stress and extrudate swell increased with increasing shear rate while shear viscosity decreased. The apparent shear stress and apparent shear viscosity increased with increasing bagasse loading and, at a given apparent shear rate, the apparent shear stress increased slightly with increasing bagasse particle size. However, detrimental bagasse agglomeration was clearly observed to take place for sample with bagasse loading in excess of 20 wt%. The surface treatment of bagasse was carried out using silane coupling agent and benzoic acid. The results proved the effect of functionalization on the interfacial adhesion between PHBV and bagasse. Also, there was also further confirmed by rheology behaviour and SEM-EDS image.

Steady Rheological Properties and Microstructure of Polycarbonate/Highly Branched Polystyrene Blends

2011 ◽  
Vol 339 ◽  
pp. 204-209
Author(s):  
Ai Ying Li ◽  
Jie Yun Chang ◽  
Xiao Bing Zuo ◽  
Rong Xin Yuan
Keyword(s):  
Shear Stress ◽  
Shear Rate ◽  
Rheological Properties ◽  
Rheological Behavior ◽  
Melt Blending ◽  
Capillary Rheometer ◽  
Two Phase ◽  
Branched Polystyrene ◽  
Spherical Droplets ◽  
Plastic Fluids

Blends of polycarbonate (PC) and highly branched polystyrene (HBPS) were prepared by melt blending. The steady rheological behavior of them was determined using a capillary rheometer, furthermore, the effect of shear rate, temperature and the blend component on the viscosity of the blends was discussed. The results showed that all the blends exhibit the nature of the pseudo-plastic fluids, and the viscosity of them decreases dramatically with the increase of temperature and does slightly with the increase of shear rate. At a fixed shear stress, the viscosity of the blends is decreased with the increase of the HBPS content. Microstructure studies using SEM showed that all the blends are characteristic of a two-phase morphology, with spherical droplets of the minor HBPS phase dispersed in the continuous PC phase.

Study on the Rheological Behaviour of Sisal Fibre/HDPE Composites with Flame Retardant

2017 ◽  
Vol 737 ◽  
pp. 307-312
Author(s):  
Apaipan Rattanapan
Keyword(s):  
Shear Rate ◽  
Flame Retardant ◽  
Magnesium Hydroxide ◽  
Shear Viscosity ◽  
Flame Retardants ◽  
Rheological Behaviour ◽  
Elongation Rate ◽  
Ammonium Polyphosphate ◽  
Sisal Fibre ◽  
Elongation Viscosity

The rheological behaviour of sisal fibre/HDPE composites containing two types of flame retardants as magnesium hydroxide and ammonium polyphosphate was studied using a capillary rheometer. The mass ratio of HDPE to sisal fibre was set as 20 phr. Flame retardants were added at 10, 20 and 30 phr. Results showed that the composites exhibited pseudoplastic behaviour as the shear viscosity decreased with increasing shear rate. Shear stress and real shear viscosity increased with increasing flame retardant, with magnesium hydroxide giving higher values than ammonium polyphosphate. Therefore, magnesium hydroxide had a marked effect on the processing power, while ammonium polyphosphate did not greatly affect the shear viscosity of the composites. An increase in elongation rate reduced the elongation viscosity. The flame retardant contents had no significant effect on the elongation viscosity at high elongation rate. The materials showed increased extrudate swell with increasing apparent shear rate, but this significantly decreased with the addition of flame retardant. The power law index (n) for all composites was less than 1 and the flow consistency index K was higher for composites with flame retardant than those without. Moreover, magnesium hydroxide was more effective than ammonium polyphosphate causing an increase in the K value.

Rheological Behavior and Mechanical Properties of PVC/V-POSS Nanocomposites

2011 ◽  
Vol 217-218 ◽  
pp. 555-558 ◽  
Author(s):  
Jun Gang Gao ◽  
Yong Gang Du ◽  
Xing Li
Keyword(s):  
Mechanical Properties ◽  
Shear Stress ◽  
Shear Rate ◽  
Rheological Behavior ◽  
Dynamic Mechanical Properties ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Capillary Rheometer ◽  
Group V ◽  
Impact Aid ◽  
Vinyl Group

The poly(vinylchloride) (PVC) nanocomposite was prepared by melt mixed of PVC with polyhedral oligomeric silsesquioxanes containing vinyl group (V-POSS). The rheological behavior of V-POSS/PVC nanocomposites was investigated by torque rheometer and capillary rheometer. The influences of composition of blends, shear rate, shear stress on melt apparent viscosity and non-Newtonian index (n) were discussed. The dynamic mechanical properties, mechanical properties and morphology were determined. The result shows that the plastic time of nanocomposites decreases while melt viscosity increases with increasing V-POSS content. V-POSS has a good compatibility with PVC. The nanocomposites have better impact strength with increasing V-POSS content. V-POSS can use as process aid and impact aid at appropriate contents.

scholarly journals Quantification of shear viscosity and wall slip velocity of highly concentrated suspensions with non-Newtonian matrices in pressure driven flows

2021 ◽  
Author(s):  
Patrick Wilms ◽  
Jan Wieringa ◽  
Theo Blijdenstein ◽  
Kees van Malssen ◽  
Reinhard Kohlus
Keyword(s):  
Shear Stress ◽  
Liquid Phase ◽  
Shear Rate ◽  
Shear Viscosity ◽  
Slip Velocity ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Wall Slip ◽  
Flow Index ◽  
Concentrated Suspensions

AbstractThe rheological characterization of concentrated suspensions is complicated by the heterogeneous nature of their flow. In this contribution, the shear viscosity and wall slip velocity are quantified for highly concentrated suspensions (solid volume fractions of 0.55–0.60, D4,3 ~ 5 µm). The shear viscosity was determined using a high-pressure capillary rheometer equipped with a 3D-printed die that has a grooved surface of the internal flow channel. The wall slip velocity was then calculated from the difference between the apparent shear rates through a rough and smooth die, at identical wall shear stress. The influence of liquid phase rheology on the wall slip velocity was investigated by using different thickeners, resulting in different degrees of shear rate dependency, i.e. the flow indices varied between 0.20 and 1.00. The wall slip velocity scaled with the flow index of the liquid phase at a solid volume fraction of 0.60 and showed increasingly large deviations with decreasing solid volume fraction. It is hypothesized that these deviations are related to shear-induced migration of solids and macromolecules due to the large shear stress and shear rate gradients.

Electrical Resistance and Acoustic Emission During Fatigue Testing of Pristine and High Velocity Impact SiC/SiC Composites at Room and Elevated Temperature

2016 ◽  
Author(s):  
Zipeng Han ◽  
Gregory N. Morscher ◽  
Emmanuel Maillet ◽  
Manigandan Kannan ◽  
Sung R. Choi ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Acoustic Emission ◽  
Cyclic Loading ◽  
Electrical Resistance ◽  
Fatigue Testing ◽  
Early Stage ◽  
Loading Conditions ◽  
Initial Attempt ◽  
Matrix Cracks ◽  
Sic Composites

Electrical resistance (ER) is a relatively new approach for real-time monitoring and evaluating damage in SiC/SiC composites for a variety of loading conditions. In this study, ER of woven silicon carbide fiber-reinforced silicon carbide composite systems in their pristine and impacted state were measured under cyclic loading conditions at room and high temperature (1200C). In addition, modal acoustic emission (AE) was also monitored, which can reveal the occasion of matrix cracks and fiber. ER measurement and AE technique are shown in this study to be useful methods to monitor damage and indicate the failure under cyclic loading. Based on the slope of the ER evolution, an initial attempt has been made to develop a method allowing a critical damage phase to be identified. While the physical meaning of the critical point is not yet clear, it has the potential to allow the failure to be indicated at its early stage.

Investigation on the Rheological Behavior of Polyamide6/Montmorillonite Nanocomposites by Reactive Extrusion

2011 ◽  
Vol 233-235 ◽  
pp. 1998-2001 ◽  
Author(s):  
Ming Zhao ◽  
Xiao Zhong Lu ◽  
Kai Gu ◽  
Xiao Min Sun ◽  
Chang Qing Ji
Keyword(s):  
Activation Energy ◽  
Shear Stress ◽  
Shear Rate ◽  
Rheological Behavior ◽  
Reactive Extrusion ◽  
Shear Thinning ◽  
Experimental Results ◽  
Montmorillonite Nanocomposites

The rheological behavior of PA6/montmorillonite(MMT) by reactive extrusion was investigated using cone-and-plate rheometer. The experimental results indicated that PA6/MMT exhibited shear-thinning behavior. The shear stress of both neat PA6 and PA6/MMT increased with the increase in the shear rate. The reduction of the viscous activation energy with the increase of shear stress reflected PA6/MMT can be processed over a wider temperature.

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