Effect of cryogrinding on surface properties of waste tyre derived reclaimed rubber

Chan, Yu Jie (2022) Effect of cryogrinding on surface properties of waste tyre derived reclaimed rubber. Project Report. Melaka, Malaysia, Universiti Teknikal Malaysia Melaka. (Submitted)

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Abstract

Rubber is a viscous and elastic elastomer. Natural rubber is an elastomer with excellent elasticity, durability and damping. It’s inferior properties can be enhanced by compounding with other polymers or adding additives. However, an increase in waste tyre rubber disposal in landfills has impacted air pollution. In fact, cryogenic grinding is adopted for waste tyre rubber processing. Also, rising demand for natural rubber has led to depletion. Then, waste tyre rubber is introduced as a raw material into natural rubber compound, cutting the final product cost. Prior to grinding, reclaiming technology is employed to process waste tyre rubber. However, reclaimed rubber is non-polar. To clarify, one of the purpose of this study is to investigate the effect of the reclaiming technique to the chemical structure of waste tyre derived reclaimed rubber (WTRR). Following that, pulverization affects the characteristics of reclaimed rubber itself. Hence, the effect of cryogrinding on surface properties of waste tyre derived reclaimed rubber (WTRR) in different particle size was studied. As reported that WTRR has a weak polar hydroxyl bond (O-H) as determined by Fourier Transform Infrared Spectroscopy (FTIR). Moreover, the intensity of WTRR’s peak after cryogenic grinding decreased with the increasing of particle size. On the other hand, Scanning Electron Microscope (SEM) analysis showed a smooth surface of WTRR after cryogenic grinding. Thermogravimetric analysis (TGA) indicated that oxygen molecule in O-H bonding affects the thermal stability of WTRR. To sum, cryoground WTRR may not be feasible alternative in rubber compounding. Properties of cryoground WTRR should be improved further.

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