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Articles by Myrtha Karina
Total Records ( 4 ) for Myrtha Karina
  Rudi Dungani , Myrtha Karina , Subyakto , A. Sulaeman , Dede Hermawan and A. Hadiyane
  The agricultural waste fibers are of notable economic and cultural significance all over the world are used for building materials, as a decorative product and as a versatile raw product. Agricultural waste fibers also have significant potential in composite due to its high strength, environmentally friendly nature, low cost, availability and sustainability. The agricultural waste is one of the most important problems that must be resolved for the conservation of global environment. The potential properties of agricultural waste fibers have sparked a lot of research to use these fibers as a material to replace man-made fibers for safe and environmentally friendly product. Agricultural waste is seen as one potential source of renewable energy. Their availability is obtained from oil palm plantations and some other agricultural industry such as rice husk, rice straw, sugarcane, pineapple, banana and coconut. Agricultural waste produces large amounts of biomass that are classified as natural fibers which until now only 10% are used as alternative raw materials for several industry, such as biocomposites, automotive component, biomedical and others.
  Fauzi Febrianto , Dina Setyawati , Myrtha Karina , Edi Suhaimi Bakar and Yusuf Sudo Hadi
  The objectives of this research was to evaluate the physical and mechanical properties of composites of Wood Flour (WF) and Recycle Polypropylene (RPP) prepared under various WF contents, WF sizes and modifier contents. WF from mixed-soft wood species and Eucalyptus deglupta Blume species were used as filler. The composites composed of 0-70% WF, 0-70% Polypropylene (PP) or RPP, various sizes of WF (60-80; 80-100 and < 120 mesh), various contents of MAH modifier (0, 1, 2.5, 5, 7.5 and 10%) and 15% Dicumyl Peroxide (DCP) initiator (based on MAH weight). Kneading conditions were set at 170 °C, 10-50 rpm for 15 min. The physical and mechanical properties of composites were greatly affected by WF content, WF size and modifier content. The greater the WF loading resulted in the greater was the reduction of tensile strength and breaking elongation values and at the same time the greater was the increasing of Young`s modulus value. The smaller the WF size resulted in the greater the tensile strength of composites. Addition of MAH modifier improved the physical and mechanical properties of composites. WF-RPP composites with 120 mesh WF size and 2.5% MA modifier had tensile strength, breaking elongation and Young`s modulus about 2.15, 2.27 and 1.18 times, respectively higher compared with composites free-MAH modifier and absorbed considerably less water. Scanning Electron Microscope (SEM) indicated that addition of MAH improved the adhesion between WF and RPP.
  Myrtha Karina , Holia Onggo and Anung Syampurwadi
  This study discusses the influence of natural fiber type on the performance of polypropylene and its recycle. Composites consisting of polypropylene (PP) and natural fiber from wood (Acacia mangium), water hyacinth (Eichornia crassipes), kenaf (Hibiscus cannabinus), banana (Musa paradisiaca) and empty fruit bunch of oil palm (Elaeis guineensis) were prepared by extrusion and compression process based on the ratio of 50:50% (w/w) with the addition of 2.5% polypropylene modified with maleic anhydride (MAPP). The effect of fiber type on the composites was evaluated. Physical and mechanical properties were studied. The composite showed significantly different properties based on the fiber type. Kenaf filled composite showed high tensile strength, break strain and modulus of elasticity properties but least absorbed water. Banana fiber filled propylene composite is comparable with that of kenaf. In general, recycle polypropylene can replace virgin polypropylene since their natural fibers filled composites showed similar mechanical and physical properties.
  Akbar Hanif Dawam Abdullah , Sri Pudjiraharti , Myrtha Karina , Oceu Dwi Putri and Rani Hasna Fauziyyah
  Background and Objective: Poor biodegradability and the contamination risk of petrochemical-based plastics encouraged the utilization of renewable resources to replace them due to their inexpensive, renewable, biodegradable and compostable properties. This study aimed to investigate the utilization of sweet potato sourced from Indonesia as a base material of bioplastic and its characteristics for food packaging application. Materials and Methods: Starch was extracted from sweet potato and bioplastics was prepared by mixing starch with glycerol using different starch:glycerol w/w ratio (2.5:1, 2.75:1, 3:1 and 3.5:1). Intermolecular interactions and microstructure of bioplastics were assessed by using FTIR and SEM, respectively. The physical and mechanical properties were evaluated by measuring the density, tensile strength and elongation at break. The relative hydrophobicity was examined by measuring the water contact angle. The biodegradability was also investigated with the aid of enzymatic degradation by microbes. Results: Microstructure of bioplastics showed the incomplete gelatinization with the increase of starch:glycerol ratio indicated by the visible inhomogeneous granules. FTIR spectra exhibited that the intermolecular interaction in bioplastics occurred through C-O-H, O-H, C-H aliphatic and C=O groups. Mechanical properties evaluation showed that bioplastic with 3.5:1 (starch:glycerol) ratio exhibited the highest tensile strength of 2.57 MPa with the lowest elongation of 6.27%. Bioplastic with 3.5:1 (starch:glycerol) ratio also showed the highest density and contact angle of 1.66 g cm3 and 50.1°, respectively. The fastest enzymatic degradation showed by the highest microbial growth was presented by bioplastic with 3.5:1 (starch:glycerol) ratio as well. Conclusion: Bioplastic with the highest sweet potato starch:glycerol ratio showed the most excellent physical, mechanical and biodegradability properties.
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