, Volume 22, Issue 1, pp 89–99 | Cite as

Insight into glass transition of cellulose based on direct thermal processing after plasticization by ionic liquid

Original Paper


Ionic liquid plasticized cellulose (IPC) materials were prepared with microcrystalline cellulose (MCC) and 25–70 wt% 1-butyl-3-methylimidazolium chloride (BmimCl) by direct thermal processing. Their chemical, morphological and crystalline structures were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and X-ray diffraction, and their glass transition behaviors and mechanical properties were discussed. The results show there is no chemical reaction between cellulose and the ionic liquid. BmimCl only acts as a plasticizer to improve the thermal processability of MCC, the IPC materials show only one glass transition terrace and can be processed repeatedly. Based on the free volume transition and the percolation of continuous hydrogen bonding networks, the effects of free volume and H-bonding interactions on the glass transition have been differentiated. Furthermore, the phase diagram with four regions has been plotted for IPC materials, which is useful to optimize the thermal processing and modulate the properties of cellulose materials.

Graphical abstract


Cellulose Ionic liquid Plasticization Thermal processing Hydrogen bonding Glass transition 



Microcrystalline cellulose


Glass transition temperature


Ionic liquid plasticized cellulose


Fourier transform infrared spectroscopy


Differential scanning calorimetry


X-ray diffraction


Scanning electron microscopy

G-T/K-B equation

Gordon-Taylor/Kelley-Bueche equation



The authors acknowledge the financial support of the National Basic Research Program of China (973 Program, 2012CB025903), the National Natural Science Foundation of China (51210004, 51373060) and the Chinese Ministry of Education (NCET-11-0174). We also thank the Analytical and Testing Center of HUST for SEM and XRD measurements.


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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  1. 1.Key Laboratory for Large-Format Battery Materials and System, Ministry of Education, School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhanChina
  2. 2.State Key Laboratory of Materials Processing and Die and Mould Technology, School of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhanChina

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