PLASTICIZATION OF STARCH?POLYBUTADIENE INCLUSION COMPLEXES USING POLYETHYLENE GLYCOL 200

• Main Author: Sarah Ghada, Karima
• Format: Final Project
• Language: Indonesia
• Subjects: Kimia
• Online Access: https://digilib.itb.ac.id/gdl/view/49182
• Institution: Institut Teknologi Bandung

Plastic is a widely used packaging material to support the needs of human life due to its lightweight, hard to damage, and water resistance properties. However, plastic has disadvantages, such as difficult to degrade, which leads to environment problems. One solution to reduce the harmful effects of plastics is natural polymer materials as plastic sources. In this study, plastics were made of cassava starch wich was complexed with polybutadiene with an average molecular weight of 1.530?2.070 g/mol. Starch was isolated from cassava with a yield of 10.8%. The inclusion complex of starch?polybutadiene was prepared by varying the concentration of polybutadiene with the ratio of starch: polybutadiene, as of 20:3, 5:1, and 4:1 (w/w). The FTIR spectra of the complexes showed vibration profiles similar to the FTIR spectrum of starch. This indicated that the polybutadiene is included in the amylose helices. The X-ray diffractograms of complexes, depicted a new peak at 2? = 20o. This also showed that the complexes were successfully formed. The UV absorption spectrum showed that there were differences in the absorption profiles between polybutadiene and the complexes, which also indicated that the complexes were successfully formed. The SEM (scanning electron microscopy) micrographs showed that the inclusion complexes had irregular morphologies. The starch?polybutadiene complexes were used to make plastic films. The optimum conditions for plastic casting were obtained at concentrations of 4%, 5%, and 6% (w/w) of the complex solutions. Plasticizing material used in this study was polyethylene glycol with an average molecular weight of 200 g/mol. The ratios of complex:polyethylene glycol were 5:1, 4:1, and 10:3 (w/w). The tensile strength of the film produced from the starch?polybutadiene20% complex (9.2 MPa) was greater than that of other starch?polybutadiene complexes (3?8 MPa). From the analysis of the mechanical properties of plastic films, three conclusions were obtained: (1) the concentration of the complex in the casting solution did not affect the mechanical properties of the plastic films, (2) the increase of the amount of polyethylene glycol resulted in a plastic film with decreasing tensile strength and increasing elongation percentage, and (3) the optimum conditions for plastic film which produced tensile strength of 9.2 MPa and elongation of 63% were obtained for a concentration of a casting solution complex of at least 4% (w/w) with a starch?polybutadiene20% complex and a complex composition:polyethylene glycol of 4:1 (w/w).