Styrene butadiene rubber/epoxidized natural rubber blends: dynamic properties, curing characteristics and swelling studies

2000 ◽  
Vol 19 (8) ◽  
pp. 879-888 ◽  
Author(s):  
H Ismail ◽  
S Suzaimah
Keyword(s):  
Natural Rubber ◽  
Dynamic Properties ◽  
Epoxidized Natural Rubber ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Rubber Blends ◽  
Curing Characteristics ◽  
Swelling Studies ◽  
Styrene Butadiene

Alpha (Vitrea) Transition in Vulcanized Natural Rubber/Styrene Butadiene Rubber Blends Prepared by Mechanical and Solution Mixing

2012 ◽  
Vol 184 ◽  
pp. 405-410 ◽  
Author(s):  
M. A. Mansilla ◽  
A.A. Ghilarducchi ◽  
H.R. Salva ◽  
A. J. Marzocca
Keyword(s):  
Natural Rubber ◽  
Preparation Method ◽  
Dynamic Properties ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Preparation Methods ◽  
Rubber Blends ◽  
Blend Composition ◽  
Rouse Theory ◽  
Styrene Butadiene

The preparation method of an elastomeric blend can influence the mechanical properties of the vulcanized compound. In this research elastomeric blends composed by natural rubber and styrene butadiene rubber were mixed using two different methods: by mixing in a roll mill and by dissolution of both elastomers in toluene, mixing of both solutions with the curatives and the evaporation of the solvent. Samples with different Natural Rubber/Styrene Butadiene Rubber relation were prepared by both methods and vulcanized at 433K with a system based on sulphur and accelerator (N-t-butyl-2-benzothiazole sulfenamide) up to the time of optimum cure. The blend composition and the preparation methods have a strong influence in the mechanical dynamic properties. Scanning Electron Microscopy observations indicate that, in the blends prepared by the dissolution method, the samples show better miscibility of the constitutive phases than those prepared by the roll milling method. The temperature dependence of the internal friction was studied for each sample using a subresonant forced pendulum at 1 Hz between 190K and 250K. Depending on the blend composition, one or two glass transition temperatures (Tg) associated to the α-relaxation were measured. In the last case each Tgcorresponds to each elastomeric phase of the compound. The loss tangent data for each compound was analyzed using a mixture law of two phases in the frame of the Rouse theory. The adjustment of the data to the proposed model was very good for both preparation method and the whole composition range of the compounds. Then it was possible to obtain the Tg, the main relaxation time and the activation energy values of each compound and, in some samples, the respective values for each elastomeric phase.

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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