Preparation of nanocrystalline cellulose via ultrasound and its reinforcement capability for poly(vinyl alcohol) composites

被引:242
作者
Li, Wei [1 ]
Yue, Jinquan [1 ]
Liu, Shouxin [1 ]
机构
[1] NE Forestry Univ, Coll Mat Sci & Engn, Harbin 150040, Peoples R China
基金
中国国家自然科学基金;
关键词
Nanocrystalline cellulose; Microcrystalline cellulose; Ultrasonication; Poly(vinyl alcohol); Nanocomposites; HIGH-INTENSITY ULTRASONICATION; ACID-HYDROLYSIS; SULFATE GROUPS; WHEAT-STRAW; DEGRADATION; BEHAVIOR; FIBRILS; FIBERS; DEPOLYMERIZATION; MICROCRYSTALS;
D O I
10.1016/j.ultsonch.2011.11.007
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
Rod-shaped nanocrystalline cellulose (NCC) was prepared from microcrystalline cellulose (MCC) using the purely physical method of high-intensity ultrasonication. Scanning electron microscopy, transmission electron microscopy, and X-ray diffraction was used for the characterization of the morphology and crystal structure of the material. The thermal properties were investigated using thermogravimetric analysis. The reinforcement capabilities of the obtained NCC were investigated by adding it to poly(vinyl alcohol) (PVA) via the solution casting method. The results revealed that the prepared NCC had a rod-shaped structure, with diameters between 10 and 20 nm and lengths between 50 and 250 nm. X-ray diffraction results indicated that the NCC had the cellulose I crystal structure similar to that of MCC. The crystallinity of the NCC decreased with increasing ultrasonication time. The ultrasonic effect was non-selective, which means it can remove amorphous cellulose and crystalline cellulose. Because of the nanoscale size and large number of free-end chains, the NCC degraded at a slightly lower temperature, which resulted in increased char residue (9.6-16.1%), compared with that of the MCC (6.2%). The storage modulus of the nanocomposite films were significantly improved compared with that of pure PVA films. The modulus of PVA with 8 wt.% NCC was 2.40x larger than that of pure PVA. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:479 / 485
页数:7
相关论文
共 51 条
[11]   Novel Process for Isolating Fibrils from Cellulose Fibers by High-Intensity Ultrasonication. II. Fibril Characterization [J].
Cheng, Qingzheng ;
Wang, Siqun ;
Han, Qingyou .
JOURNAL OF APPLIED POLYMER SCIENCE, 2010, 115 (05) :2756-2762
[12]   Poly(vinyl alcohol) nanocomposites reinforced with cellulose fibrils isolated by high intensity ultrasonication [J].
Cheng, Qingzheng ;
Wang, Siqun ;
Rials, Timthy G. .
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING, 2009, 40 (02) :218-224
[13]   Green chemistry - The sonochemical approach [J].
Cintas, P ;
Luche, JL .
GREEN CHEMISTRY, 1999, 1 (03) :115-125
[14]   Thermomechanical depolymerization of dextran [J].
Cote, GL ;
Willet, JL .
CARBOHYDRATE POLYMERS, 1999, 39 (02) :119-126
[15]   Forcing and controlling chemical reactions with ultrasound [J].
Cravotto, Giancarlo ;
Cintas, Pedro .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2007, 46 (29) :5476-5478
[16]   Effect of microcrystallite preparation conditions on the formation of colloid crystals of cellulose [J].
Dong, XM ;
Revol, JF ;
Gray, DG .
CELLULOSE, 1998, 5 (01) :19-32
[17]   Nanostructural Reorganization of Bacterial Cellulose by Ultrasonic Treatment [J].
Faria Tischer, Paula C. S. ;
Sierakowski, Maria Rita ;
Westfahl, Harry, Jr. ;
Tischer, Cesar Augusto .
BIOMACROMOLECULES, 2010, 11 (05) :1217-1224
[18]   POLYMER NANOCOMPOSITES REINFORCED BY CELLULOSE WHISKERS [J].
FAVIER, V ;
CHANZY, H ;
CAVAILLE, JY .
MACROMOLECULES, 1995, 28 (18) :6365-6367
[19]   Sono-chemical preparation of cellulose nanocrystals from lignocellulose derived materials [J].
Filson, Paul B. ;
Dawson-Andoh, Benjamin E. .
BIORESOURCE TECHNOLOGY, 2009, 100 (07) :2259-2264
[20]  
Fleming K, 2001, CHEM-EUR J, V7, P1831, DOI 10.1002/1521-3765(20010504)7:9<1831::AID-CHEM1831>3.0.CO