An effort to improve electrical property of Polypropylene (PP)/Clay nanocomposite was conducted. Carbon black (CB) was introduced into PP/Clay to enhance that property as required for conductive polymer composites (CPCs) application. The compositions of CB on PP/Clay were varied at 3, 5, and 7 percent hundred resin (phr). In this research, all composites were prepared by melt mixing using an internal mixer at 222 °C, 83 rpm, and 10 minutes. A compatibilizer, PP-grafted-Maleic Anhydride (PP-g-MA), was used to facilitate dispersion of clay layers and CB particles on PP matrix. The electrical property of composite was evaluated from their surface resistivity using insulation tester. Meantime thermal-oxidative stability property was analyzed from oxidative induction time (OIT) data using Differential Scanning Calorimetry (DSC) instrument. The presence of CB dramatically decreased surface resistivity of PP/Clay from 6.98 x 1013 ohm to 7.35 x 106 ohm by adding CB 7 phr. OIT of PP/Clay dropped 155% compare with neat PP. On the other hand, the addition of CB 7 phr into PP/Clay improved OIT of PP/Clay up to 22 %. The interlayer structure of clay was investigated using X-ray Diffraction (XRD) to find out the synergistic effect between clay and CB. Actually, clay interlayer spacing did not change due to the addition of CB.
Waste plastic bags (WPB) from high density polyethylene (HDPE) have been reprocessed for many applications. However, it is limited to be used as wood plastic composites (WPC) for building applications as the decrease of mechanical properties. This research examined the optimal composition of WPB that can be added to WPC and complied with Indonesian Standard (SNI) 8154 – 2015. Samples were produced according to extreme vertices mixture design using twin screw extruder (TSE). The materials were WPB bounded in the range of 0 to 20 wt%, sawdust at 50 to 70 wt%, neat HDPE at 30 to 50 wt%, and HDPE grafting maleic anhydride (PE-g-MA) at 0 to 10 wt%. The compositions were optimized to obtain desired flexural modulus and strength as required on SNI standard. The optimized formula was then reproduced and characterized to analyze its water content, density, swelling, and formaldehyde content. The results showed that the optimum formula was predicted at 3 wt% of WPB, 50 wt% of sawdust, 37 wt% of neat HDPE, and 10 wt% of PE-g-MA, giving 2111 MPa and 27.3 MPa of predicted values that above the minimum requirement for WPC material (2000 MPa for modulus, 20 MPa for strength). Meanwhile, the modulus and strength of verification sample were 2173 MPa and 25.7 MPa. Further analysis on the other properties showed 0.6 ± 0.1% of water content, 1.7 ± 1.4% of swelling, and 0.015 ± 0.000 mg/L of formaldehyde that lower than maximum specifications, and 1.13 ± 0.01 g/cm3 of density that above minimum the requirement.
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