| Abstrakt: |
Coconut shell activated charcoal has been used as a filler in a natural rubber starch composites. The quality of composites may change during transportation and storage. This research aims to investigate effect of the filler to vulcanization and morphology of the natural rubber starch composites. The composite was prepared at a various coconut shell activated charcoal load, i.e., 0, 15, 30, 45, and 60 phr. The vulcanization characteristics include minimum torque modulus (MH), maximum torque modulus (ML), and optimum vulcanization time (t90) and scorch time (ts2) and morphology of modified-natural rubber starch. The morphology was analyzed with SEM micrographs. The results showed that the best treatment was obtained at 45 phr coconut shell active charcoal loading, with MH torque modulus of 7.26 kg.cm, ML of 1.32 kg.cm, the optimum time t90 vulcanization of 6.14 minutes and a scorch time ts2 of 2.42 minutes. According to the result, coconut shell activated charcoal could be used as a new filler because of its ability to improve vulcanized characterization (MH and ML) and shorten t90 and ts2. In other words, the greater a load of coconut shell activated charcoal, MH and ML is greater and t90 and ts2 are smaller, reaching the optimum of coconut shell activated charcoal load 45 phr. Morphology analysis with SEM micrographs reveals strengths and weaknesses in the system. SEM analysis shows that the starch particles mixed homogeneously with the natural rubber. Coconut shell activated charcoal influences the characteristics of vulcanization and morphology of natural rubber starch modified. [ABSTRACT FROM AUTHOR] |
