Abstract
Polyurea microcapsules containing 33, 50 and 67 wt-% sulphur were prepared by interfacial polymerisation. The characteristics of the fabricated microcapsules were investigated for morphology, thermal property and release property in vulcanising rubber. The morphology showed that microcapsules loading 33 wt-% sulphur were spherical and smooth. The microcapsule sizes decreased going from 33 to 50 to 67 wt-% sulphur. Thermal analysis demonstrated that the microcapsules were thermally stable below 250°C. The process of sulphur released from polyurea microcapsules was put forward in vulcanising nitrile butadiene rubber (NBR) and verified by vulcanising property and tensile strength and elongation of the vulcanised NBR.
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