Abstract:
This research has a purpose to investigate the effect of combination compositions of
polypropilene (PP) with natural rubber (NR) and of sulfur composition at property and
morphology of NR/PP blending by means of dynamic vulcanization.Making of
mastication and compound rubber can be done by helping of roll mill equipment at
room temperature with a speed of 18 rpm.the Blending o f PP/NR was done in an
internal mixer in the NR/PP mass ratio of 40/60,50/50,60/40. As a curative agent for
dynamic vulcanization in the NR, the sulfur composition made were of 1 and 3 phr ( per
hundred rubber ). The blending was done at temperature of 180° C and a speed of 60
rpm. The properties analysed here were tensile strength of blending matters which were
tested by means o f universal testing machine in regard with ISO 527-3-5 as a standard.
The blending morphology was analysed with an equipment of Scanning Electron
Microscopy (SEM).From this research it can be concluded that the more compositions
of NR has a higher elongation at break and a lower tensile strength. In the contrary,the
more dominant PP compositions blending has a higher tensile strength and a lower
elongation at break. From morfology analyse can be concluded that the crosslinkage of
vulcanized rubber is more complete at higher compositions of sulfur.In addition, rubber
phase distribution in the matrices of PP is more complete as well as the sulfur
compositions are made higher. This can be viewed from the scanned photograph in
which the higher sulfur compositions of blending has a narrower distance of molecules.
