Isolation of cellulose nanocrystals from grain straws and their use for the preparation of carboxymethyl cellulose-based nanocomposite films.
Cellulose nanocrystals (CNCs) were isolated from rice straw (RS), wheat straw (WS), and barley straw (BS) by using acid hydrolysis method. They were fibrous in shape with length (L) of 120-800nm and width (W) of 10-25nm, aspect ratio (L/W) of 18, 16 and 19, crystallinity index (CI) of 0.663, 0.710, and 0.634, and yield of 64, 75, and 69wt% for RS, WS, and BS respectively. Carboxymethyl cellulose (CMC)/CNC composite films were prepared with various concentration of the CNCs. SEM results showed that the CNCs were evenly distributed in the polymer to form homogeneous films. Mechanical and water vapor barrier properties were varied depending on the type of CNCs and their concentration. Tensile strength (TS) increased by 45.7%, 25.2%, and 42.6%, and the water vapor permeability (WVP) decreased by 26.3%, 19.1%, and 20.4% after forming composite with 5wt% of CNCs obtained from RS, WS, and BS, respectively.
Department of Food Engineering and Bionanocomposite Research Institute, Mokpo National University, 61 Dorimri, Chungkyemyon, Muangun, 534-729 Jeonnam, Republic of Korea; Food Engineering and Packaging Department, Food Technology Research Institute, Agricultural Research Center, Giza, Egypt.
Ahmed A
AA
Oun
Department of Food Engineering and Bionanocomposite Research Institute, Mokpo National University, 61 Dorimri, Chungkyemyon, Muangun, 534-729 Jeonnam, Republic of Korea. Electronic address: jwrhim@mokpo.ac.kr.
Jong-Whan
JW
Rhim
D002266:Carboxymethylcellulose Sodium / Q000737:chemistry* / Q000302:isolation & purification*; D002523:Edible Grain / Q000737:chemistry*; D006868:Hydrolysis; D053761:Nanocomposites / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D013227:Steam; D013718:Tensile Strength
D013227:Steam; D002266:Carboxymethylcellulose Sodium
Barley straw; Bio-nanocomposite; Carboxymethyl cellulose; Cellulose nanocrystals; Rice straw; Wheat straw