Cellulose Studies

Cellulose Studies

“…220, and then only gradually decreases during the next 175 hrs. The limiting value here is just twice that for re-generated cellulose found by Mehta and Pacsu [16], and for methyl cellulose found by Steele and Pacsu [32]. Fractionation of Native Cellulose Hydrolyzed for 6 and 24 Hrs.…”

“…In general, four points were plotted, and the straight line resulting was extrapolated linearly to give the value of qsp/c at c ~ 0, which was taken as the intrinsic viscosity, [ q ] (see Figure 1). The [32], af Ekenstam [9,10], Jorgensen [14], and Battista [1]. Their equation was used to determine the rate constants for the acid hydrolysis, and was expressed as where k is the rate constant, t is the time of hydrolysis in sec., D.P.t is the average D.P.…”

Cellulose Studies

“…The latter was first purified by the standard purification process used in this laboratory [27], then treated with 1 N hydrochloric acid for 24 hr. at 60° C. The native hydrocellulose produced by this method was washed twice with distilled water, thrice with methanol, once with ether, and then dried in the oven at 55° C. The D.P.…”

A facile method to prepare methylcellulose from annual plants and wood using iodomethane

“…The activation of cellulose was the most important step in homoge- [8] and dimsyl sodium [9] were used as activation agents in homogeneous methylation. In heterogeneous methylation, caustic alkaline solutions were used to mercerize cellulose and form alkali cellulose; methylcellulose was synthesized in organic slurry with toluene [10][11] or isopropanol [12]. Timell and Purves found that the heterogeneous methylation was intermicellar with dimethyl sulfate while the uniform substituent distribution of commercial methylcellulose indicated that it was intramicellar with chloromethane [13].…”