FABRIKASI DAN KARAKTERISASI SIFAT BENDING DAN DAYA SERAP AIR KOMPOSIT HIBRID UNTREATED SISAL/KARBON/PVC DENGAN VARIASI PERBANDINGAN SERAT SISAL DAN KARBON
Abstract
In general sports equipment that currently still contains weaknesses, because it can use synthetic materials that cannot be decomposed naturally (nonbiodegradable). Materials that are not easily degraded, usually hybrids by combining synthetic fibers and fibers that can be decomposed naturally. The purpose of this study is to make a hybrid PVC composite material with fiber reinforcement material that is not needed and carbon fiber that has been soaked in liquid nitrogen which has superior mechanical properties and meets the standards of sports device materials.
Fabrication of hybrid composites was carried out manually with an engineered hot press machines at a temperature of 170oC with a pressure of 120 N / m² for 15 minutes. The composition of hybrid composites with a matrix / filler ratio of 80/20% by weight and comparison of sisal and carbon hybrid fibers (2/1), (1/1), and (1/2) with a variation of the treatment duration of liquid nitrogen soaking for 10 minutes. Bending tests was done with ASTM D790 standard and water absorption test was done with ASTM D570 standard were carried out on all hybrid composite specimens. Then the characterization of the fracture structure of the bending test was carried out from each side of the cross section carried out with scanning electron microscopy (SEM) and optical microscope (OM, Olympus SZ61TR).
The results showed that the hybrid PVC / sisal / carbon composite with the highest bending stress and modulus of elasticity on the sisal / carbon (1/2) variation compositions were 81,96 MPa and 1,46 GPa, and also the results of the water absorption test results obtained the biggest water absorption in sisal / carbon / PVC variation 15/5/80. These results are explained from the results of the characterization of the fault structure with SEM and macro photos that show a better fiber bond with a matrix