Judul: Characterization and Biodegradation of Polyblend (Styrofoam-Starch) with Polylactid acid (PLA) as Biocompatizer.
Abstrak: Styrofoam is a kind of polystyrene which can not be naturally decomposed. The increasing amount of using styrofoam causes environment pollution. In facing this problem, modification of recyclable styrofoam is needed to produce degradable plastic. Starch can be a solution because it is a polymer that can be biologically decomposed. The mixture of starch to the styrofoam composite creates biodegradable plastic. Unfortunately, various polarity of styrofoam and starch is difficult to mixed homogenously, so we need polylactic acid (PLA) as the biocompatizer. Styrofoam and starch of four different concentrations of PLA, 5, 10, 15, and 20%. Film with the highest homogeneity was given by 80:20 concentration of styrofoam and starch combination with 20 % of PLA addition. The more PLA, the more homogenous of film we got. Film with the highest homogeneity produced substantial weight reduction which about 10%. The film that has been produced was amorphous since it had wide melting point, 155 °C to 185 °C. Infrared spectrum film showed the existence of C-O ester on 1184 cm-1 region. Ester functional group indicated that the film could be biodegraded. The infrared spectrum of the film did not show new functional groups, so we concluded that the film was a product of physical mixture between styrofoam and starch.
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Judul: Produksi Plastik Komposit dari Campuran Tapioka-Onggok Termoplastis dengan Compatibilized Polietilen
Abstrak: One of alternative solution for plastic disposal problem is by developing biodegradable plastic. The typical drawbacks of starch-based plastic is inferior of its physico-mechanical properties. In order to improve the physico-mechanical properties and compatibility of blending system, tapioca-casava bagasse was modified into thermoplastic tapioca-casava bagasse blends while polyethylene was compatibilized by addition maleic anhydride. The aim of this research was to produce composite plastic from thermoplastic tapioca-casava bagasse blends and compatibilized polyethylene (compt-HDPE, compt-LDPE and compt-LLDPE). This research investigated the effect of fiber content in formulating the tapioca-casava bagasse blends, as 5, 10, 15 and 20%; glycerol (as plasticizer) concentration, as 30, 35 and 40% to the mechanical, thermal, biodegradability and surface morphological properties of composite plastics. The result showed that fiber contents in blends tapioca-casava bagasse up to 15% can improve physico-mechanical properties (tensile stress at yield, tensile stress at break and thermal properties) but addition of glycerol more than 30% can decrease mechanical composite plastic properties especially for HDPE. Introduction of thermoplastic tapioca-casava bagasse in polyethylene composite plastic generally can decrease physico-mechanical properties plastic. Synthetic polymer that suitable with thermoplastic blends tapioca-casava bagasse was compt-HDPE. The best result gained from 40% thermoplastic blends with HDPE, 15% of fiber and 30% of glycerol contents. Biodegradability test showed that composite plastic can be degraded, but only natural component such as starch and fiber was degraded.
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Judul: Infeksi Cacing Jantung Dirofilaria Immitis, Railliet & Henry, 1911 Pada Anjing
Abstrak: Cacing Dirofilaria immitis dewasa yang tinggal dalm ventrikel kanan jantung anjing, sering kali menimbulkan gejala klinis yang cukup berat. Cacing Tersebut menghasilkan mikrofilaria yang selanjutnya berkembang menjadi larva infektif dalam saluran malphigi induk semang entara, yaitu nyamuk dari genus Culex, Aedes dan Anopheles.
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