NDLI: Effect of processing conditions on gel formation in ternary cellulose acetate systems

Content Provider	Springer Nature Link
Author	Kadla, John F. Hsieh, Chia Wen Carmen
Copyright Year	2011
Abstract	A series of ternary systems composed of cellulose acetate (CA), N,N-dimethylacetamide (DMA), and water were prepared by varying the mixing temperature and order of component addition with increasing water content. The viscoelastic properties of the resulting ternary systems were measured using steady state and dynamic rheology. The CA/DMA/H2O mixture formed physical gels at 17.5 and 19 wt% water concentrations after heating to 50 and 70/90 °C, respectively. Gel formation was characterized by the loss of a Newtonian plateau in the steady state as well as the transition of the elastic (G′) modulus becoming greater than the viscous (G″) modulus in the dynamic state. The order of component addition dramatically affected phase behaviour. Adding CA to the DMA/water solution resulted in lower moduli gels and the formation of a two-phase phase separated system at high nonsolvent contents in those prepared at low temperatures. The kinetics of phase separation was improved by subjecting the gels to a thermal treatment of 90 °C. In this case, the gels previously heated at 50 and 70° C showed a one-phase phase separated gel with higher viscous and elastic moduli.
Starting Page	69
Ending Page	79
Page Count	11
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	19
Issue Number	1
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-11-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Cellulose acetate Network gels Phase separation Bioorganic Chemistry Organic Chemistry Physical Chemistry Polymer Sciences
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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