Journal
CARBOHYDRATE POLYMERS
Volume 113, Issue -, Pages 403-410Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2014.07.031
Keywords
Nanocellulose fibrils; CTMP; Ultrasonication; Poly(vinyl alcohol)
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Funding
- Research Fund for the Fundamental Research Funds for the Central Universities [DL13BBX14, 2572014EB01]
- National Natural Science Foundation of China [31170545]
- National Key Technology RD Program [2012BAD32B04]
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Long filamentous nanocellulose fibrils (NCFs) were prepared from chemical-thermomechanical pulps (CTMP) using ultrasonication. Their contribution to enhancements in thermal stability and mechanical properties of poly(vinyl alcohol) films were investigated. The unique chemical pretreatment and mechanical effects of CTMP loosen and unfold fibers during the pulping process, which enables further chemical purification and subsequent ultrasound treatment for formation of NCFs. The NCFs exhibited higher crystallinity (72.9%) compared with that of CTMP (61.5%), and had diameters ranging from 50 to 120 nm. A NCF content of 6 wt% was found to yield the best thermal stability, light transmittance, and mechanical properties in the PVA/NCF composites. The composites also exhibited a visible light transmittance of 73.7%, and the tensile strength and Young's modulus were significantly improved, with values 2.8 and 2.4 times larger, respectively, than that of neat PVA. (C) 2014 Elsevier Ltd. All rights reserved.
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