Penentuan Berat Molekul dan Derajat Polimerisasi α-Selulosa yang Berasal dari Alang-alang (Imperata cylindrica) dengan Metode Viskositas

Research of the determination of molecular weight and degree of polymerization α-cellulose from seagegrass ( Imperata cylindrica ) by viscosity method had been done. To obtain the      α-cellulose, it was done using delignification process. Furthermore, the α-cellulose was characterized by infra red spectrum (FTIR) testing by compared with the infra red spectrum of α-cellulose standard. The α-cellulose viscosity was measured by using Ostwald viscometer and measurement of molecular weight and degree of polymerization based on Mark-Kuhn-Houwink equation. The results showed that the molecular weight and degree of polymerization of the α-cellulose from seagegrass ( Imperata cylindrica ) were 8.242,7g/mol and 45,8, respectively with the percentage of seagegrass α-cellulose was 45%. Keywords: seagegrass (Imperata cylindrica) , viscosity intrinsic , molecular weight , degree of polymerization