Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 131, Issue 19, Pages -Publisher
WILEY-BLACKWELL
DOI: 10.1002/app.40832
Keywords
cellulose; composites; nanocrystals; poly(propylene carbonate); sol-gel process
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Funding
- Innovation Program of Shanghai Municipal Education [12ZZ062]
- Fundamental Research Funds for the Central Universities
- Programme of Introducing Talents of Discipline to Universities [111-2-04]
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Cellulose nanocrystals (CNCs) organogels were first produced from aqueous dispersion through solvent exchange of CNCs to acetone via a simple sol-gel process. After mixing the organogels with poly(propylene carbonate) (PPC) in dimethylformamide followed by solution casting, green nanocomposites were obtained with CNCs well dispersed in PPC polymer matrix which was confirmed by scanning electron microscopy observations. Differential scanning calorimeter analysis revealed that glass transition temperature of the nanocomposites was slightly increased from 34.0 to 37.4 degrees C. Tensile tests indicated that both yield strength and Young's modulus of CNCs/PPC nanocomposites were doubled by adding 10 wt % CNCs. However, poor thermal stability of PPC occurred after incorporating with CNCs due to the thermo-sensitive sulfate groups located on the surface of CNCs. Furthermore, PPC became more hydrophilic because of the inclusion of CNCs according to the water contact angle measurement. The enhanced mechanical and hydrophilic properties, coupled with the inherent superior biocompatibility and degradability, offered CNCs/PPC composites potential application in biomedical fields. (C) 2014 Wiley Periodicals, Inc.
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