| dc.description.abstract | 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. | en_US |
