Polycaprolactone grafting of cellulose nanocrystals in ionic liquid [BMIM]Cl.
Huang, Q., Huang, J., and Chang, P.R. (2014). "Polycaprolactone grafting of cellulose nanocrystals in ionic liquid [BMIM]Cl.", Wuhan University Journal of Natural Sciences, 19(2), pp. 117-122. doi : 10.1007/s11859-014-0987-3 Access to full text
A polycaprolactone-grafted cellulose nanocrystal (PCL-g-CN) was prepared in ionic liquid and characterized by Fourier transform infrared spectrum (FT-IR), X-ray diffraction (XRD), and transmission electron microscopy (TEM). A peak assigned to the carbonyl group appears at 1 730 cm−1 in the FT-IR of PCL-g-CN, which confirms that the grafting reaction is successfully completed. The morphologies of PCL-g-CNs still maintain rod-like structure according to the TEM images. XRD results show that the crystal type of the PCL-g-CNs changed from cellulose I to cellulose II. The reasons for crystal transition of CNs turn out to be combined effects of anion and cation in ionic liquid with CNs.
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