期刊
CARBOHYDRATE POLYMERS
卷 127, 期 -, 页码 381-389出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.03.029
关键词
Nanocellulose; Nanocomposites; Thermal analysis; Transparency; PMMA
资金
- republic of Turkey, The Scientific and Technological Research Council of Turkey (TUBITAK)
- U.S. Army Corps of Engineers, Engineer Research and Development Center [912HZ-07-2-0013]
- Maine Agricultural and Forest Experiment Station (MAFES) [ME09615-08MS]
- Wood Utilization Research Hatch project
Nanocomposites of polymethylmethacrylate (PMMA) and cellulose were made by a solution casting method using acetone as the solvent. The nanoflber networks were prepared using three different types of cellulose nanoflbers: (i) nanofibrillated cellulose (NFC), (ii) cellulose nanocrystals (CNC) and (iii) bacterial cellulose from nata de coca (NDC). The loading of cellulose nanoflbrils in the PMMA varied between 0.25 and 0.5 wt%. The mechanical properties of the composites were evaluated using a dynamic mechanical thermal analyzer (DMTA). The flexural modulus of the nanocomposites reinforced with NDC at the 0.5 wt% loading level increased 23% compared to that of pure PMMA. The NFC composite also exhibited a slightly increased flexural strength around 60 MPa while PMMA had a flexural strength of 57 MPa. The addition of NDC increased the storage modulus (11%) compared to neat PMMA at room temperature while the storage modulus of PPMA/CNC nanocomposite containing 0.25 and 0.5 wt% cellulose increased about 46% and 260% to that of the pure PMMA at the glass transition temperature, respectively. Thermogravimetric analysis (TGA) indicated that there was no significant change in thermal stability of the composites. The UV-vis transmittance of the CNF nanocomposites decreased by 9% and 27% with the addition of 0.25 wt% CNC and NDC, respectively. This work is intended to spur research and development activity for application of CNF reinforced PMMA nanocomposites in applications such as: packaging, flexible screens, optically transparent films and light-weight transparent materials for ballistic protection. (C) 2015 Elsevier Ltd. All rights reserved.
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