scholarly journals Curing characteristics and rheological properties of bentonite- filled rubber blends

2021 ◽  
Vol 1199 (1) ◽  
pp. 012037
Author(s):  
Z Mičicová ◽  
S Božeková ◽  
M Pajtášová ◽  
D Ondrušová
Keyword(s):  
Fine Fraction ◽  
Rheological Behaviour ◽  
Complex Viscosity ◽  
Partial Replacement ◽  
Optimum Time ◽  
Maximum Torque ◽  
Rubber Blends ◽  
Filled Rubber ◽  
Curing Characteristics ◽  
Strain Sweep

Abstract The study deals with the examination of the rheological behaviour of rubber blends which were filled with bentonite. The filler - polymer as well as the filler - filler interactions were studied and determined from the frequency sweep and strain sweep rheological measurements. The used natural bentonite was extracted from the locality called Jelsovy Potok. The natural bentonite had a fine fraction with a particle size of 15μm a 45 μm and it was added into rubber blends as a partial replacement of commonly used filler. The rubber blends were characterised on the basis of curing characteristics (minimum torque ML, maximum torque MH, optimum time of cure t(c90), processing safety of blend ts,). Moreover, the complex viscosity and Payne effect were also specified. The required measurements were done by using PRPA 2000.

scholarly journals Effect of bentonite modified by silane on rubber blends properties

2018 ◽  
Vol 157 ◽  
pp. 07006 ◽  
Author(s):  
Zuzana Mičicová ◽  
Slavomíra Božeková ◽  
Mariana Pajtášová ◽  
Darina Ondrušová
Keyword(s):  
Partial Replacement ◽  
Rubber Matrix ◽  
Solution Ph ◽  
Optimum Time ◽  
Maximum Torque ◽  
Rubber Blends ◽  
Propyl Methacrylate ◽  
Curing Characteristics ◽  
Minimum Torque

The presented paper deals with the preparation of bentonite modified by silane and its application into polymer matrix. Natural bentonite was modified with 3-(Trimethoxysilyl) propyl-methacrylate in two different solutions. These two solutions had the same composition (ethanol, water and 3-(Trimethoxysilyl) propyl-methacrylate) but in one solution, pH was modified. These bentonites modified by silane were characterized by Fourier transform infrared spectroscopy. The modified bentonites were mixed into rubber matrix as partial replacement of commonly used filler – carbon black of the N339 type. The polymer blends were investigated from the aspect of the rheological and curing characteristics (minimum torque ML, maximum torque MH, optimum time of cure t(c90), processing safety of blend ts,). Moreover, the quality of the silanization reactions was investigated. Measurements were done using PRPA 2000.

scholarly journals Study of clay minerals effect on curing characteristics of polymer blends and physical-mechanical properties of prepared vulcanizates

2018 ◽  
Vol 157 ◽  
pp. 07010
Author(s):  
Beáta Pecušová ◽  
Mariana Pajtášová ◽  
Zuzana Mičicová ◽  
Darina Ondrušová ◽  
Andrea Feriancová ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polymer Blends ◽  
Clay Minerals ◽  
Structural Type ◽  
Partial Replacement ◽  
Curing Characteristics ◽  
Dioctahedral Smectite ◽  
The Common ◽  
The Given

The given paper deals with the study of the properties of clay minerals, namely montmorillonite and moreover, it is focused on effect of these clay minerals on the curing characteristics of the polymer blends and the physical-mechanical properties of prepared vulcanizates. Montmorillonite is a major clay mineral which has a wide application in many industrial branches. It belongs to the group of dioctahedral smectite minerals with structural type in the ratio of 2:1. Characteristics of prepared modified and organomodified clay minerals are based on sulphur vulcanisation accelerators which are used for the preparation of real polymer blend where they represent a partial replacement of the common carbon black filler and then, the effect on the curing characteristics of polymer blends as well as physical-mechanical properties of the prepared vulcanizates are investigated. The results exhibit that the clay-based filler (modified and organomodified clay minerals) can be used as a partial replacement while the quality of the prepared blends is preserved.

Natural Rubber/Styrene Butadiene Rubber/Recycled Nitrile Glove (NR/SBR/rNBRg) Ternary Blend: Curing Characteristics and Swelling Test

2013 ◽  
Vol 594-595 ◽  
pp. 634-638 ◽  
Author(s):  
N.Z. Nik Yahya ◽  
N.Z. Noimam ◽  
Hanafi Ismail ◽  
Mohd Arif Anuar Mohd Salleh ◽  
Santiagoo Ragunathan
Keyword(s):  
Natural Rubber ◽  
Swelling Behavior ◽  
Styrene Butadiene Rubber ◽  
Ternary Blend ◽  
Butadiene Rubber ◽  
Maximum Torque ◽  
Curing Characteristics ◽  
Cure Time ◽  
Styrene Butadiene ◽  
Minimum Torque

Curing characteristics and swelling behavior of natural rubber/styrene butadiene rubber/recycled nitrile glove (NR/SBR/rNBRg) blends were investigated. Eleven composition ratio; 50/50/0, 50/40/10, 50/30/20, 50/20/30, 50/10/40, 50/0/50, 40/50/10, 30/50/20, 20/50/30, 10/50/40, and 0/50/50 of SMRL/SBR/rNBRg with the size of rNBRg ; 2.5 3.0 cm2 were prepared by using two roll mill at room temperature. Cure characteristics such as scorch time,t2, cure time,t90, minimum torque, ML, maximum torque, MH, and swelling behavior of SMRL/SBR/rNBRg ternary blends were examined. Results indicated that the scorch time and maximum torque of the NR/SBR/rNBRg blends decreased with increasing rNBRg content. The minimum torque of the blends increased as rNBRg content increased. The cure time of NR/SBR/rNBRg blends show a unique trend, which are depending on the domain rubber content. The increment in rNBRg content decreased the crosslink density of NR/SBR/rNBRg blends.

Shear Thickening Behaviour of Composite Propellant Suspension under Oscillatory Shear

2016 ◽  
Vol 66 (3) ◽  
pp. 222 ◽  
Author(s):  
D. Singh ◽  
G. Dombe ◽  
C. Bhongale ◽  
P. P. Singh ◽  
Mehilal Maurya ◽  
...  
Keyword(s):  
Strain Amplitude ◽  
Loss Modulus ◽  
Shear Thickening ◽  
Rheological Behaviour ◽  
Complex Viscosity ◽  
Solid Particles ◽  
Dynamic Moduli ◽  
Composite Propellant ◽  
Plateau Region ◽  
Temperature Constant

Composite propellant suspensions consist of highly filled polymeric system wherein solid particles of different sizes and shapes are dispersed in a polymeric matrix. The rheological behaviour of a propellant suspension is characterised by viscoplasticity and shear rate and time dependant viscosity. The behaviour of composite propellant suspension has been studied under amplitude sweep test where tests were performed by continuously varying strain amplitude (strain in %, γ) by keeping the frequency and temperature constant and results are plotted in terms of log γ (strain amplitude) vs logGʹ and logGʺ (Storage modulus and loss modulus, respectively). It is clear from amplitude sweep test that dynamic moduli and complex viscosity show marked increase at critical strain amplitude after a plateau region, infering a shear thickening behaviour.

Curing characteristics and mechanical and aging properties of ethylene propylene diene monomer/calcium carbonate/bentonite hybrid composites

2016 ◽  
Vol 49 (5) ◽  
pp. 397-407 ◽  
Author(s):  
Nurus Sakinah Che Mat ◽  
Hanafi Ismail ◽  
Nadras Othman
Keyword(s):  
Fatigue Life ◽  
Calcium Carbonate ◽  
Hybrid Composites ◽  
Partial Replacement ◽  
Ethylene Propylene Diene Monomer ◽  
Ethylene Propylene ◽  
Curing Characteristics ◽  
Roll Mill ◽  
Cure Time ◽  
Loading Ratio

Ethylene propylene diene monomer (EPDM)/calcium carbonate/bentonite (Bt) hybrid composites were prepared via a laboratory size two-roll mill. In this work, loading ratio of calcium carbonate to Bt was varied, that is, 30/0, 5/25, 15/15, 25/5 and 0/30 parts per hundred rubber. The effect of partial replacement of calcium carbonate with Bt on the curing characteristics, tear properties, morphology, aging and fatigue life of the hybrid composites was studied. On increasing Bt loading, cure time, scorch time and maximum torque of EPDM/calcium carbonate (CaCO3)/Bt composites decreased, whereas minimum torque increased. The tear strength and fatigue life of EPDM/CaCO3/Bt hybrid composites showed improvement with increasing Bt loading. The results also showed that the retention of aging of EPDM/CaCO3/Bt hybrid composites decreased with increasing Bt loading.

scholarly journals The use of illite in function of filler applied in rubber blend

2021 ◽  
Vol 1199 (1) ◽  
pp. 012035
Author(s):  
M Pajtášová ◽  
B Pecušová ◽  
S Ďurišová ◽  
D Ondrušová ◽  
Z Mičicová ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Clay Mineral ◽  
Rate Coefficient ◽  
Curing Time ◽  
Maximum Torque ◽  
Rubber Industry ◽  
Rubber Blend ◽  
Curing Characteristics ◽  
Positive Effect

Abstract The presented work was dealing with the study of the commercial filler influence change in rubber blend by an alternative filler based on the clay mineral - illite. The focus of the presented work was aimed at the study of selected curing characteristics of rubber blend with addition of clay mineral filler and physico-mechanical properties of prepared vulcanizates. Curing characteristics, the processing safety, minimum and maximum torque, optimal curing time and curing rate coefficient were determined during the curing experiment phase. Selected physico-mechanical properties were given by the determination of hardness, tensibility and tensile strength. The obtained results proved the possibility of partial commercial filler replacement by an alternative filler and the positive effect of clay mineral on resulting important properties in rubber industry.

scholarly journals Curing characteristics of chlorosulphonated polyethylene and natural rubber blends

2005 ◽  
Vol 70 (5) ◽  
pp. 695-703 ◽  
Author(s):  
Gordana Markovic ◽  
Blaga Radovanovic ◽  
Jaroslava Budinski-Simendic ◽  
Milena Marinovic-Cincovic
Keyword(s):  
Electron Microscopy ◽  
Natural Rubber ◽  
Morphological Analysis ◽  
Blend Ratio ◽  
Rubber Blends ◽  
Curing Characteristics ◽  
Compatibility Factor ◽  
Chlorosulphonated Polyethylene ◽  
Blend Ratios ◽  
Scanning Electron

The dependence of the Mooney scorch time and cure index on the blend ratio of chlorosulphonated polyethylene/natural rubber (CSM/SMR 20 CV) and chlorosulphonated polyethylene/chlorinated natural rubber (CSM/Pergut S 40) blends were determined in the temperature range from 120 oC to 160 oC using a Monsanto Mooney viscometer. Semi-efficient vulcanization systems were used for the study. The morphology of the fracture surface of the crosslinked systems was determined by Scanning Electron Microscopy (SEM). The results showed that the scorch time decreased with increasing SMR 20 CV and Pergut S 40 contents. This observation is attributed to the increasing solubility of sulfur, as the content of SMR 20 CV and Pergut S 40 in the composition increased. For temperatures greater than 140 oC, the dependence of the scorch time on blend ratios diminishes, as enough thermal energy is available to overcome the activation energy of vulcanization. The differing curing characteristics of the two blends is explained by the compatibility factor of the respective blend. Morphological analysis of the blends shows a very satisfactory agreement.

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