Journal
CARBOHYDRATE POLYMERS
Volume 197, Issue -, Pages 204-214Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2018.05.087
Keywords
Cellulose nanocrystal; Surface modification; Poly(lactic acid); Nanocomposite
Categories
Funding
- National Natural Science Foundation of China [21774068, 51573082, 51503113, 21303111, 21673148]
- Taishan Mountain Scholar Foundation [TS20081120, tshw20110510]
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In this study, lactic acid monomer or dimer is grafted onto CNC by a simple esterification reaction. The quantitative solid-state C-13 NMR spectrum suggests that more than 87% of all the available OH groups on the surface of CNC are substituted by lactic acid. Such modified CNC (CNC-g-LA) exhibits excellent thermostability and nano-sized dispersion in chloroform. Benefit from this character, fully biobased PLLA/CNC-g-LA nanocomposite could be prepared simply by a solution-casting method. The crystallization behavior of obtained nanocomposites has been systematically investigated by differential scanning calorimetry (DSC). The results show that the crystallization rate of PLLA is distinctly enhanced. Moreover, the mechanical properties of nanocomposites are also improved remarkably by the addition of CNC-g-LA because of its excellent dispersion and compatibility with PLLA matrix. This study provides a green and facile way to modify CNC for fabricating bio-nanocomposites with fast crystallization rate and improved mechanical properties.
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