Epoxidized natural rubber tensile strength

Epoxidized natural rubber is still a strain crystallizing mbber and therefore retains the high tensile strength of natural rubber. However, as can be seen from Table 5, in other respects they have very little in common. The epoxidation renders a much higher damping mbber, a much-improved resistance to oil swelling (insofar as a 50 mol % modified natural mbber has similar oil resistance to a 34% nitrile mbber), and much-reduced air permeability. This latest form of modified natural mbber therefore widens the applications base of the natural material and enables it to seek markets hitherto the sole province of some specialty synthetic mbbers. 

Similar result were obtained when the oil palm wood flour (OPWF) was mixed with epoxidized natural rubber (ENR). The increase of OPWF content resulted in the decrease of tensile strength and elongation at break of the OPWF/ENR composites. However, it increased tensile modulus, tear strength and hardness. Moreover, the cure (t ) and scorch time decreased when the OPWF content increased. Larger particle size of OPWF resulted in shorter t and scorch time, while the highest fiber content with the smallest particle size resulted in the highest torque [27]. 

It has been reported that ultimate tensile strength (UTS) of pure PVC- epoxidized natural rubber (ENR) blend reduced from 9 MPa to 6 MPa upon addition of 30% OPFs [11]. The reduction in tensile strength of composites at higher fiber loading was due to the agglomeration of the filler particles to form a domain that acts like a foreign body. 

Natural rubber/chlorosulfonated polyethylene rubber blends also exhibited immiscibility. Chlorosulfonated polyethylene rubber is the synthetic rubber used for applications in electric cables, hoses for liquid chemicals, waterproof cloths, floor tiles, and oil-resistant seals. It is chosen to blend with natural rubber to improve the resistance of natural rubber to ozone, oil, heat, flame and non-polar chemicals. This is due to the effect of the polarity of the chlorine groups in the chlorosulfonated polyethylene rubber. The tensile strength, elongation at break, and tear strength of these blends decreased with the increasing chlorosulfonated polyethylene rubber contents. In addition, the compatible natural rubber/chlorosulfonated polyethylene rubber blends were improved by adding the epoxidized natural rubber (Epoxyprene 25) as a... 

---