Influence of combined pretreatment of quadrol and anhydrous ionic liquid microemulsion on the physicochemical property of masson pine

ABSTRACT The physical properties of laboratory‐prepared anhydrous ionic liquid microemulsion, including quasi‐ternary phase diagram, conductivity, surface tension, and simulating graph of a microscopic particle system were investigated to maintain the optimum ratio of CTAB (Hexadecyl trimethyl ammonium Bromide) and n‐butyl alcohol at 1/24 to 1/12. The microemulsion region can reach a maximum of 75% at lower temperatures. We constructed a combined pretreatment of quadrol and anhydrous ionic liquid microemulsion on masson pine powder and analyzed its properties by Fourier‐transform infrared, thermogravimetric analysis‐derivative thermogravimetry, XRD (X‐ray diffraction), and scanning electron microscope. Results showed that hemicellulose and a noncrystalline region in cellulose were disrupted effectively after pretreatment. Relative crystallinity increased from 35.8 to 49.8. A few crystalline structures of cellulose I were recrystallized and then transformed to cellulose II as indicated by IR, XRD, and DTG results. Thermostability decreased, and the region with a main thermal weight loss at 375°C shifted to the region with a lower temperature at 310°C. The yield of glucose can reach to 78.2%, which is 2.2 times than that of untreated powder; the combined pretreatment is an effective method to promote the development of bio‐energy. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39794.