Pengaruh Konsentrasi Asam Stearat dan Lama Pengadukan Proses Gelatinisasi terhadap Karakteristik Komposit Bioplastik Maizena-Glukomanan

This study aims to determine the effect of stearic acid concentration and stirring time also interaction both on characteristic cornstarch-glucomannan bioplastic composite produce best characteristic. The research used a factorial randomized block design. first factor is consisting 4 levels that 0.1%; 0.2%; 0.3%; 0.4% (w/w). second are 3, 4, 5, 6 minutes. observed variable this were tensile strength, elongation at break, modulus young, swelling, water vapour transmission rate (WVTR), biodegradation, functional group profile. data analyzed variant continued with Duncan Multiple Range Test (DMRT). result indicate gelatinization process has very significant but had no break. between treatments Concentration minutes treatment resulted in strength 22.17 MPa, break 8.55%, young 260.87 swelling 81.58%, 0.638 g/m2.hour biodegradability 7 days. consists hydroxyl (O-H), carboxyl (C-O), carbonyl (C=O), hydrocarbon (CH2)n.
 Keywords : bioplastic, cornstarch, glucomannan, acid,