PEMBUATAN DAN PENCIRIAN POLIPADUAN GABUS POLISTIRENAPATI

MUHAMMAD SYAEFUL FAHMI

DEPARTEMEN KIMIA FAKULTAS MATEMATIKA DAN ILMU PENGETAHUAN ALAM

INSTITUT PERTANIAN BOGOR BOGOR

2010

ABSTRAK

MUHAMMAD SYAEFUL FAHMI. Pembuatan dan Pencirian Polipaduan Gabus PolistirenaPati. Dibimbing oleh SUMINAR S. ACHMADI dan TETTY KEMALA.

Gabus polistirena (PS) merupakan polimer yang banyak digunakan namun sulit terdegradasi. Oleh karena itu, telah dikembangkan polipaduan gabus PSpati. Pengaruh tambahan gliserol sebagai pemlastis juga diamati melalui analisis mekanik dan termal. Polipaduan gabus PSpati dihasilkan dengan mencampurkan larutan gabus PS dan larutan pati dengan nisbah komposisi 60:40, 65:35, 70:30, 75:25, dan 80:20 persen berdasarkan bobot. Sebanyak 20% poli(asam laktat) ditambahkan sebagai bahan pengkompatibel. Polipaduan dianalisis dengan pengujian kuat tarik, bobot jenis, dan sifat termal. Polipaduan gabus PSpati yang dihasilkan berwarna putih keruh dan rapuh. Kuat tarik dan bobot jenis polipaduan berada pada kisaran kuat tarik dan bobot jenis gabus PS sehingga dapat dijadikan sebagai bahan pembuat gabus PS. Kuat tarik meningkat seiring dengan meningkatnya nisbah gabus PS dengan komposisi gabus PSpati terbaik 80:20. Pengaruh tambahan gliserol tidak teramati pada analisis termal, serta sedikit menyebabkan penurunan kuat tarik dan bobot jenis.

ABSTRACT

MUHAMMAD SYAEFUL FAHMI. Preparation and Characterization of Polystyrene Foam-Starch Polyblend. Under the direction of SUMINAR S. ACHMADI dan TETTY KEMALA. Polystyrene (PS) foam is a polymer that is widely used but not biodegradable. Therefore, PS foam-starch polyblend was developed. The effect of glycerol as plasticizer was evaluated based on mechanical and thermal analyses. PS foam-starch polyblends were produced by mixing PS foam and starch solution with composition ratios of 60:40, 65:35, 70:30, 75:25, and 80:20 percent by weight. Polylactic acid (20%) was added as compatibilizer. The polyblends were analyzed using tensile strength test, thermal properties, and density. The PS foamstarch polyblends were white opaque in color and fragile. The properties of tensile strength and density of the polyblends were in the range of that of pure PS foam, indicating that they can be used as materials for PS foam. The tensile strength increases as increasing of PS foam constituents with the best ratio of 80 PS foam to 20 of starch. The PS foamstarch polyblends tensile strength and density increase with the increasing PS foam. Additional amount of glycerol did not affect the thermal property, but has caused a slight decrease in tensile strength and density.