Studies On Synthesis And Thermosensitive Property Of Cellulose-Based Hybrid Materials

As the most abundant natural polymer on the earth, cellulose has many attractive properties such as renewability, biodegradability, biocompatibility, and broad chemical-modifying capacity. Therefore, cellulose has been considered as the sustainable raw material of energy and chemical engineering in the future. Nowadays, cellulose has attracted a worldwide attention as a renewable resource that can be converted into high value products, in which specific attention has been paid on cellulose based advanced functional materials. The various cellulose-based functional materials, such as fiber materials, membrane materials, photoelectric materials, hybride materials, smart materials, and biomedical materials, are studied. In this paper, thermosensitive nanocellulose and filter paper were prepared by using atom transfer radical polymerization method, and study the thermosensitive character.Based on cellulose(degreasing cotton, filter paper) as raw material, thermosensitive hybrid materials were synthesized by using atom transfer radical polymerization method. First, acid hydrolysis of degreasing cotton yield highly crystalline rodlike particles by 64% H2SO4, then diluted with distilled water, finally forming stable aqueous suspension. Core-shell hybrid materials(silica-nanocellulose) with high specific surface area were prepared by electrostatic adsorption, then thermosensitive nanocellulose hybrid materials were prepared by atom transfer radical polymerization. The samples were characterized and analyzed by FI-IR, TG, BET, XRD, DSC, TEM. FI-IR and TG spectrograms showed that PNIPAAm was successfully grafted into silica-nanocellulose materials. The location of PNIPAAm was confirmed by N2 adsorption-desorption experiment. The novel thermosensitive carrier was applied to load and release IBU experiment. A good load of 46.2%, 32.6% were got at the temperature of 20℃ and 45℃, respectively. At 1060 min of release time, the cumulative release were reached 63.1% and 82.2% at 20℃ and 45℃ respectively. The load and release performance of thermosensitive material were well confirmed. Mesoporous silica-cellulose hybrid materials were prepared by sol-gel coating process on nature cellulose paper, then thermosensitive paper was got by atom transfer radical polymerization. The specific surface area of the material was as high as 63.17 m2/g. Quality change curve were got in different humidity environment. The experimental results exhibited an extraordinary capability of collecting water.