SINTESIS DAN KARAKTERISASI KOPOLIMER PATI SAGU (Sago Starch) DENGAN AGEN CROSSLINK ASAM SITRAT
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Generally polymers has been developed and unconsciously, all of our needs can not be separated from the things made from polymers. But that is unfortunate, only a polymer synthetic plays an important role in the life cycle. In fact, all around us there are still a lot of natural potential can be developed into a natural polymer with a variety of benefits, no less with synthetic polymers. In this case, for example sago starch. Sago starch has amylose contents of 27% and 73% of amylopectin. However, during the production process takes place, it causes the starch be degraded polymer due to chains damage. Therefore, to improve characterization of sago starch biopolymer, it can be done through copolymerization with citric acid. The method which is used to conduct research is crosslinking between sago starch and citric acid to obtain a polyester compound. Citric acid which is used are 0 g, 0,25 g, 0,5 g, 0,75 g, 1,00 g and 1,25g to determine the effect of the addition to the physical nature test that is swelling and chemical tests conducted structure test. The results of this research note that the addition of citric acid with more composition can make more polyester so that the mechanic strength be better which is represented by the structure test using FTIR and physical properties test using % swelling data that describes the level of swelling of the copolymer in a compatible buffer solution with the body’s pH. The characteristic test show that copolymers is used to be drug delivery system. Physical characteristic represented by copolymer was yielded is more used a citric acid hence downhill of % swelling. While time of swelling also have an effect on longer time of swelling hence of % swelling mount. Chemical characteristic is formed by C=O ester absorption signal area of around 1741,2 cm-1, 1021,79 and 1247 cm-1 for C-O-C signal and 3300-3600 cm-1 for the absorption of O-H.