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Blend of natural rubber (NR) and chlorosulfonated
polyethylene (CSM) was so interesting due to binding of the good oil resistance
of CSM, the good mechanical properties and low cost of NR. However, due to the
different polarities of two rubbers, phase separation and inferior properties
of NR/CSM blend were obtained. The practical way to improve its properties is
the addition of the third component to bind both phases of the blend. Effects
of poly(vinyl chloride), PVC as compatibilizer on cure characteristics,
morphology, mechanical properties and automotive fuel resistance of NR/ CSM
blend were investigated. In this contribution, NR/CSM blend with blend ratio of
50/50 was prepared using a two-roll mill, and then vulcanized in a compression
mold at 160°C. The PVC content was varied from 1 to 7 phr. It was found that
the usage of 7 phr PVC led to improve interaction between NR and CSM phases.
Therefore, increase in cure characteristics, mechanical strength and automotive
fuel resistance of the blend was observed.
The natural rubber (NR) was mixed with chlorosulfonated
polyethylene (CSM), due to the difference of polarity in NR and CSM made this blend incompatible and the third component was used.
Epoxidzed natural rubber (ENR) was used as a third
component. NR/CSM blended with the blend ratio of 50/50 was prepared by using a
two-roll mill and vulcanization in a compression mold at 160°C. The ENR
content was varied from 1 to 7 phr. The curing characteristics, morphology,
mechanical properties, and automotive fuel swelling were investigated. The
results indicated that the cure time of the blend rubbers was shorter
as adding ENR. The mechanical properties of the blend rubbers
were not affected by ENR content. However, automotive fuel resistance of the
blend rubbers was found to increase with adding ENR in rubber blend.