Qi H, Chang C, Zhang L (2008) Effects of temperature and molecular weight on dissolution of cellulose in NaOH/ urea aqueous solution. Cellulose 15:779-787Haisong Qi,Chunyu Chang,Lina Zhang.Effects of temperature and molecular weight on dissolution of cellulose in NaOH/urea aqueous solution[J...
Dissolution of cellulose having different viscosity-average molecular weight ( M η ) in 7wt%NaOH/12wt%urea aqueous solution at temperature from 60 to 12.6°C was investigated with optical microscope, viscosity measurements and wide X-ray diffraction (WXRD). The solubility (S a ) of cellulose...
and the properties of the polymer solution can be estimated based on the osmotic pressure calculation formula of a reliable solution. The Flory-Huggins theory is used to describe the behavior of polymer solutions, calculating osmotic pressure as a function of the molecular weight of polymers by con...
aSolution mixtures of low- and high-molecular-weight polymers, PAtBA and HMWP 1, respectively, were prepared such that the high-molecular-weight polymer was the minor component and the low-molecular-weight polymer was the major component. 低和高分子量的聚合物解答混合物, PAtBA和HMWP 1,分别,准...
Given the molecular weight of NaOH is 40, answer the following question: How much NaOH do you need to make 200 ml of 0.5 M NaOH solution? How could a simple osmometer be used to estimate the molecular weight of an unknown non-penetrating solute? How would you m...
Briefly, 1-(3′-dimethylaminopropyl)-3-ethylcarbodiimide (EDAC, 200 mmol) was added to a solution containing 200 mol of biotin-hydrazide and 10 mg of fucan B dissolved in 0.1 M HCl (20 mL). The reaction was maintained at pH 4.8 with 0.01 M HCl. After 1 h, ...
NaOH solutions have the greatest capability to swell towards cellulose and partly dissolve the polymer at temperatures below I0°C. The solubility, S., of various cellulose samples in 9% (w/v) aq. NaOH solution at "room temperature" was as follows 2 : cellulose fiber obtained by denitration...
The samples of interested were fully dissolved in 2 M NaOH solution (D2O) and loaded in NMR tubes. The recycle delay was set to 6 s. The quantifications of probe molecules were determined by the integrals of their 1H signals, normalized by the integral of the benzene 1H signal of ...
0.025 g), glutamic acid (0.8 mmol, 0.118 g), glutamine (0.6 mmol, 0.088 g), asparagine (0.6 mmol, 0.080 g), or phenylalanine (0.6 mmol, 0.099 g) was added, respectively, and the pH value of the solution was adjusted to 8-9 with NaOH solution. ...
Use of 1.0 M urea–1.0 M NaOH as solvent broke not only intermolecular hydrogen bonds but also partial covalent bonds of the α-glucan in aqueous solution, resulting in a decrease of M w and [ η]. The urea and NaOH concentrations, storage time with stirring, and mode of preparation of...