Journal
JOURNAL OF RENEWABLE MATERIALS
Volume 5, Issue 5, Pages 410-422Publisher
TECH SCIENCE PRESS
DOI: 10.7569/JRM.2017.634144
Keywords
Nanocellulose; modification; nanocomposites; characterization
Funding
- Public-Private Partnership for Nanotechnology (P3Nano) US Endowment for Forestry and Communities, Inc. [CWFSCL15]
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Cellulose nanocrystals (CNCs) are renewable and sustainable filler for polymeric nanocomposites. However, their high hydrophilicity limits their use with hydrophobic polymer for composite materials. In this study, freeze-dried CNCs were modified by transesterification with canola oil fatty acid methyl ester to reduce the hydrophilicity. The transesterified CNCs (CNCFE) were compounded with PLA into nanocomposites. CNCFE with long-chain hydrocarbons plays a role as plasticizer. Increasing CNCFE loadings resulted in clear plasticizing effects. Lower T g and T m were achieved for CNCFE-based nanocomposites. Plasticizing nanocomposite melt with CNCFE can mitigate the degradation of CNCs during thermal processing. The elongation at break of nanocomposites containing 5% CNCFE was increased. Dynamic rheological study showed the highest elastic and viscous moduli (G' and G) and complex viscosity (G*) of nanocomposites with addition of 2% CNCFE. By tailoring the loadings of the transesterified CNCs, tunable structure and properties of nanocomposites can be obtained.
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