Ageing studies of ethylene propylene diene monomer rubber/styrene butadiene rubber blends: Effects of heat, ozone, gamma radiation, and water

2007 ◽  
Vol 107 (5) ◽  
pp. 2923-2929 ◽  
Author(s):  
T. Muraleedharan Nair ◽  
M. G. Kumaran ◽  
G. Unnikrishnan ◽  
Sam Kunchandy
Keyword(s):  
Gamma Radiation ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Ethylene Propylene Diene Monomer ◽  
Ethylene Propylene ◽  
Rubber Blends ◽  
Styrene Butadiene

A novel chemical technique for compatibility of ethylene-propylene-diene monomer rubber and styrene-butadiene rubber in their blends

2016 ◽  
Vol 49 (4) ◽  
pp. 298-314 ◽  
Author(s):  
Sara Estagy ◽  
Saeed Ostad Movahed ◽  
Soheil Yazdanbakhsh ◽  
Majid Karim Nezhad
Keyword(s):  
Mechanical Properties ◽  
Heat Flow ◽  
Classical Problem ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Ethylene Propylene Diene Monomer ◽  
Scanning Calorimetry ◽  
Covalent Bonds ◽  
Ethylene Propylene ◽  
Styrene Butadiene

The market for commercial polymer blends has grown steadily. A good blend should have strong interphases between different parts of the constituted polymers. Lack of strong interphases is a classical problem of the blend industry. Ethylene-propylene-diene monomer rubber (EPDM)/styrene-butadiene rubber (SBR) blends have a very good aging resistance and good compression sets. However, these rubbers are partially miscible. To improve the miscibility of EPDM and SBR in their blends, a Lewis acid, AlCl3, was used to form EPDM–g–SBR copolymer through Friedel–Crafts reactions. The existence of covalent bonds between EPDM and SBR macromolecules was studied by the cure traces of the blends, that is, ΔTorque, Fourier transform infrared spectrums, differential scanning calorimetry (DSC) heat flow curves, thermogravimetric analysis curves, and scanning electron (SEM) micrographs. Subsequently, several blends with EPDM/SBR ratio of 40/60 and with various AlCl3 amounts were prepared and after curing, their mechanical properties were measured and compared. The results showed covalent bonds formed between SBR–EPDM and SBR–SBR macromolecules. An exothermic change in heat flow in the DSC curve was observed around 111.28°C, which can be attributed to the formation of carbocations in Friedel–Crafts reactions. Adding 2 phr AlCl3 had an efficient effect on EPDM–SBR and or SBR–SBR linkages. The mechanical properties of the cured blends, that is, tensile strength were lower when compared with corresponding values for prepared compound with SBR. Excellent compatibility between the two polymers and strong interphases were observed in SEM micrograph of the cured blend with 1 phr AlCl3.

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