| Abstract:Straw nanocellulose was prepared by means of acid hydrolysis-ultrasonic method using bleached alcohol straw pulp as raw material. At 54% sulfuric acid concentration, liquid ratio 1︰16, hydrolysis was carried out at 60℃ for 60 minutes, or at 56% sulfuric acid concentrated, liquid ratio 1︰18, hydrolysis was implemented at 60℃ for 60 minutes, followed by ultrasonic treatment at 800 W for 20 minutes ,the nanocellulose with the highest yield and highest crystallinity was prepared which exhibited typical cellulose I type crystal structure and had short rod structure under SEM observation. Its width was about 10~30 nm, length from 100~500 nm. Particle size analysis found that more than 90% particle radius distribution was basically in between 20 ~ 50 nm.The thermal stability analysis found that the degradation of the sample took place in three main processes of 180～240 °C, 240～320 °C, and 320～480 °C. |
