Abstract
Due to the conflicting data available, the effects of the various types of crosslinks on the physical properties of natural rubber (NR) were investigated. Similar studies were also carried out on styrene-butadiene rubber in order to examine the possible effects of strain-induced crystallization on the phenomena observed for NR. Various vulcanization systems such as conventional, efficient, treated and untreated with triphenylphosphine vulcanizates were studied. The results show that vulcanizates with crosslinks which are predominantly polysulphidic exhibit properties (viz. tensile strength, modulus and elongation at break) superior to those of the corresponding mono-sulphidic crosslinking vulcanizates. However, a similar trend is not found with the tearing strengths which are the same for both polysulphide and monosulphide systems. It is also considered that the effect of strain-induced crystallization on the differences in physical properties for polysulphide and monosulphide crosslinking systems in NR are insignificant.
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