scholarly journals CURE CHARACTERISTICS AND CROSSLINK DENSITY OF NATURAL RUBBER/STYRENE BUTADIENE RUBBER BLENDS

2015 ◽  
Vol 3 (4) ◽  
pp. 1-5
Author(s):  
Indra Surya ◽  
Syahrul Fauzi Siregar
Keyword(s):  
Natural Rubber ◽  
Crosslink Density ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Blend Ratio ◽  
Rubber Blends ◽  
Cure Characteristics ◽  
Rubber Compounds ◽  
Cure Time ◽  
Styrene Butadiene

By using a semi-efficient vulcanization system, the cure characteristics and crosslink density of natural rubber/styrene butadiene rubber (NR/SBR) blends were studied with a blend ratio from 0 to 100% rubber. The scorch time, optimum cure time, and torque difference value of the blended rubber compounds were determined by using the Moving-Die Rheometer (MDR 2000). The crosslink density was determined by the Flory—Rehner approach. Results indicate that the scorch and cure times, ts2 and t90, of the NR/SBR blends increased with increasing the SBR content. Whilst, the maximum values of torque difference and crosslink density were performed by the NR/SBR blend with a blend ratio of 75/25.

The Effects on the Cure Characteristics and Physical Properties of Bamboo Activated Carbon Filled Styrene Butadiene Rubber (SBR) Compounds

2015 ◽  
Vol 815 ◽  
pp. 24-28
Author(s):  
N.R. Munirah ◽  
N.Z. Noriman ◽  
M.Z. Salihin ◽  
H. Kamarudin ◽  
M.H. Fatin ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Physical Properties ◽  
Filler Loading ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Cure Characteristics ◽  
Rubber Compounds ◽  
Roll Mill ◽  
Cure Time ◽  
Styrene Butadiene

The role of activated carbon (AC) in rubber compounds was investigated to better understand the reinforcing mechanism. The activated carbon filled styrene butadiene rubber vulcanizates (SBR-AC) using bamboo activated carbon as filler were prepared by using two-roll mill and cured at 160 °C. AC filler loading from 10 to 50 phr (part per hundred rubber) were used in this study. Study into the influences of filler loading on the cure characteristics, swelling behaviour and physical properties (hardness and resilience) of SBR-AC vulcanizates were carried out. It was observed that SBR-AC vulcanizates has better cure characteristics compared to the styrene butadiene rubber gum vulcanizate (SBR-GV) which is a non-filled vulcanizate. The results showed that the scorch time (ts2) decreased with increasing filler loading. The cure time (tc90) slightly decreased up to 20 phr before a rise as the filler loading increased. The minimum torque (ML) of SBR vulcanizate increased and the maximum torque (MH) decreased up to 20 phr but then increased with increasing filler loading. The cure rate index (CRI) of SBR-GV vulcanizate was higher than that of all SBR-AC vulcanizates. Up to 20 phr of filler loading, the CRI increased before a decline occurred as the filler loading increased. As expected, the hardness value of SBR-AC vulcanizates was higher compared to SBR-GV vulcanizate which has lower resilience. The hardness and crosslink density showed an increasing trend meanwhile the resilience was adversely affected by the increase in filler loading. Bamboo activated carbon showed some potential enhancement on the reinforcing and physical properties of the vulcanizates.

Effect of 1-phenyl-2,4-dithiobiuret as secondary accelerator on cure characteristics and vulcanisate properties of natural rubber-styrene/butadiene rubber blends

2003 ◽  
Vol 32 (1) ◽  
pp. 3-10 ◽  
Author(s):  
Abi Santhosh Aprem ◽  
Kuruvilla Joseph ◽  
Sabu Thomas ◽  
Nektaria Marianthi Barkoula ◽  
J. Karger-Kocsis
Keyword(s):  
Natural Rubber ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Rubber Blends ◽  
Cure Characteristics ◽  
Styrene Butadiene

Effect of Recycled Nitrile Glove (rNBRg) Particle Sizes on Curing Characteristics and Physical Properties of Natural Rubber/Styrene Butadiene Rubber/Recycled Nitrile Glove (NR/SBR/rNBRg) Blends

2015 ◽  
Vol 815 ◽  
pp. 54-58 ◽  
Author(s):  
N.Z. Nik Yahya ◽  
Nik Noriman Zulkepli ◽  
Hussin Kamarudin ◽  
Hanafi Ismail ◽  
Sam Sung Ting ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Crosslink Density ◽  
Styrene Butadiene Rubber ◽  
Particle Sizes ◽  
Butadiene Rubber ◽  
Maximum Torque ◽  
Curing Characteristics ◽  
Cure Time ◽  
Styrene Butadiene ◽  
Minimum Torque

Effects of different particle sizes of recycled nitrile glove (rNBRg) on curing characteristics and physical properties of natural rubber/styrene butadiene rubber/recycled nitrile glove (NR/SBR/rNBRg) blends were studied. The particle sizes of rNBRg were differentiated by the method of producing. S1 was obtained by cutting the rNBRg (whole glove) into smaller sheet; S2 was obtained by passing rNBRg through 2 rolls mill for 10 times; S3 was obtained by passing rNBRg through 2 rolls mill for 10 times and then mechanically grinded. NR/SBR/rNBRg blends were prepared at 50/30/20 composition using two roll mill at room temperature, with different particle sizes, rNBRg (S1), rNBRg (S2) and rNBRg (S3). Scorch time, cure time, minimum torque, maximum torque, crosslink density and hardness of the blends were examined. Results indicated that scorch time, cure time and minimum torque decreased as the rNBRg particle size decreased, while maximum torque and crosslink density increased. The rigidity of NR/SBR/rNBRg blends increased when smaller rNBRg particles were used, which explained the increased in hardness and decreased in resilience of the blends.

Novel modification of styrene butadiene rubber/acrylic rubber blends to improve mechanical, dynamic mechanical, and swelling behavior for oil sealing applications

2021 ◽  
pp. 096739112110313
Author(s):  
Ahmed Abdel-Hakim ◽  
Soma A el-Mogy ◽  
Ahmed I Abou-Kandil
Keyword(s):  
Mechanical Properties ◽  
Crosslink Density ◽  
Physical And Mechanical Properties ◽  
Dynamic Mechanical Properties ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Rubber Blends ◽  
Dynamic Mechanical ◽  
Oil Resistance ◽  
Styrene Butadiene

Blending of rubber is an important route to modify properties of individual elastomeric components in order to obtain optimum chemical, physical, and mechanical properties. In this study, a novel modification of styrene butadiene rubber (SBR) is made by employing acrylic rubber (ACM) to obtain blends of outstanding mechanical, dynamic, and oil resistance properties. In order to achieve those properties, we used a unique vulcanizing system that improves the crosslink density between both polymers and enhances the dynamic mechanical properties as well as its resistance to both motor and break oils. Static mechanical measurements, tensile strength, elongation at break, and hardness are improved together with dynamic mechanical properties investigated using dynamic mechanical analyses. We also proposed a mechanism for the improvement of crosslink density and consequently oil resistance properties. This opens new opportunities for using SBR/ACM blends in oil sealing applications that requires rigorous mechanical and dynamic mechanical properties.

Thermal conductivity of styrene butadiene rubber compounds with natural rubber prophylactics waste as filler

1999 ◽  
Vol 35 (9) ◽  
pp. 1687-1693 ◽  
Author(s):  
N.S. Saxena ◽  
P. Pradeep ◽  
G. Mathew ◽  
S. Thomas ◽  
M. Gustafsson ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Natural Rubber ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Rubber Compounds ◽  
Styrene Butadiene

scholarly journals Effects of alkanolamide addition on cure characteristics, crosslink density and tensile properties of carbon-black-filled styrene-butadiene rubber compounds

2018 ◽  
Vol 197 ◽  
pp. 12006 ◽  
Author(s):  
Indra Surya ◽  
Hanafi Ismail
Keyword(s):  
Tensile Strength ◽  
Carbon Black ◽  
Tensile Properties ◽  
Crosslink Density ◽  
Density Measurement ◽  
Tensile Modulus ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Cure Characteristics ◽  
Styrene Butadiene

By using a semi-efficient sulphur vulcanisation system, the effects of alkanolamide (ALK) addition on cure characteristics, crosslink density and tensile properties of carbon black (CB)-filled styrene-butadiene rubber (SBR) compounds were investigated. The ALK was prepared from Refined Bleached Deodorized Palm Stearin and diethanolamine and added into the CB-filled SBR compounds. The ALK loadings were 1.0, 3.0, 5.0 and 7.0 phr. It was found that ALK decreased the scorch and cure times of the CB-filled SBR compounds. ALK also improved the tensile modulus and tensile strength; especially up to a 5.0 phr of loading. The crosslink density measurement proved that the 5.0 phr of ALK exhibited the highest degree of crosslink density which caused the highest in tensile modulus and tensile strength. Due to its plasticity effect, ALK increased the elongation at break of the CB-filled SBR vulcanisates.

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.

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