A polycaprolactone-graffed 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 micro...A polycaprolactone-graffed 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 suc- cessfully completed. The morphologies of PCL-g-CNs still main- tain rod-like structure according to the TEM images. XRD results show that the crystal type of the PCL-g-CNs changed from cellu- lose 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.展开更多
基金Supported by Supporting Project of New Century Excellent Talents of Ministry of Education of China(NCET-11-0686)Fundamental Research Funds for the Central Universities(Self-Determined and Innovative Research Funds of WUT 2012-Ia-006)+1 种基金ecoENERGY Innovation Initiative of Canada,Program of Energy Research and Development(PERD)of CanadaState Key Laboratory of Pulp and Paper Engineering,South China University of Technology(201212)
文摘A polycaprolactone-graffed 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 suc- cessfully completed. The morphologies of PCL-g-CNs still main- tain rod-like structure according to the TEM images. XRD results show that the crystal type of the PCL-g-CNs changed from cellu- lose 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.
