TY - JOUR
T1 - Effect of solvent type on the dispersion quality of spray-and freeze-dried CNCs in PLA through rheological analysis
AU - Özdemir, Burcu
AU - Nofar, Mohammadreza
N1 - Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/9/15
Y1 - 2021/9/15
N2 - Polylactide (PLA) nanocomposites with spray-and freeze-dried cellulose nanocrystals (i.e., SCNC and FCNC) were prepared through solution casting using four different solvents: tetrahydrofuran (THF), chloroform (CHL), dimethylformamide (DMF), and dimethyl sulfoxide (DMSO). Small amplitude oscillatory shear rheological analysis was extensively employed to explore the CNC dispersion quality in PLA. Overall, the rheological properties differences of PLA/SCNC and PLA/FCNC nanocomposites were not very significant. Moreover, the use of THF and CHL did not lead to a proper dispersion of CNCs in PLA due to their low dielectric constants. On the other hand, while the use of DMF was effective on the enhancement of CNC dispersion, DMSO could more dramatically lead to such enhancement due to its higher dielectric constant. The percolation threshold in PLA/SCNC nanocomposites prepared with DMF and DMSO was predicted around 1.52 and 0.12 wt% CNC, respectively. The crystallization behavior of PLA/nanocomposites prepared with DMF and DMSO were also explored.
AB - Polylactide (PLA) nanocomposites with spray-and freeze-dried cellulose nanocrystals (i.e., SCNC and FCNC) were prepared through solution casting using four different solvents: tetrahydrofuran (THF), chloroform (CHL), dimethylformamide (DMF), and dimethyl sulfoxide (DMSO). Small amplitude oscillatory shear rheological analysis was extensively employed to explore the CNC dispersion quality in PLA. Overall, the rheological properties differences of PLA/SCNC and PLA/FCNC nanocomposites were not very significant. Moreover, the use of THF and CHL did not lead to a proper dispersion of CNCs in PLA due to their low dielectric constants. On the other hand, while the use of DMF was effective on the enhancement of CNC dispersion, DMSO could more dramatically lead to such enhancement due to its higher dielectric constant. The percolation threshold in PLA/SCNC nanocomposites prepared with DMF and DMSO was predicted around 1.52 and 0.12 wt% CNC, respectively. The crystallization behavior of PLA/nanocomposites prepared with DMF and DMSO were also explored.
KW - Cellulose nanocrystal
KW - Nanocomposite
KW - Polylactide
KW - Rheological properties
KW - Solvent
UR - http://www.scopus.com/inward/record.url?scp=85107064914&partnerID=8YFLogxK
U2 - 10.1016/j.carbpol.2021.118243
DO - 10.1016/j.carbpol.2021.118243
M3 - Article
C2 - 34127223
AN - SCOPUS:85107064914
SN - 0144-8617
VL - 268
JO - Carbohydrate Polymers
JF - Carbohydrate Polymers
M1 - 118243
ER -