By Kenji Kamide
Many hugely acclaimed and authoritative books on polymer technology are inclined to specialise in man made polymers. Cellulose and Cellulose Derivatives is the 1st authoritative ebook at the topic. It examines fresh advancements, with specific connection with cellulose (in aqueous alkali) and cellulose acetate. full of examples, the writer takes an in-depth examine the subject, utilizing the main trustworthy experimental info to be had. A accomplished method of the basic ideas of cellulose and its derivatives in answer makes Cellulose and Cellulose Derivatives perfect interpreting for newcomers in addition to skilled cellulose scientists. * Outlines the theoretical basics of cellulose and cellulose derivatives* provides finished and trustworthy experimental ends up in figures and tables * hugely illustrated and simple to learn
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Additional resources for Cellulose and Cellulose Derivatives (Polymer Science Library)
Example text
1) is another important parameter for characterizing cellulose derivatives. ^ The former is generally based on the difference in reactivity of three unsubstituted hydroxyl groups in tosylation^ with/7-toluenesulfonyl chloride, followed by iodination with sodium iodide or tritylation^ with tritylchloride in the presence of pyridine, and is very tedious and time consuming. In addition, by this chemical method, the DS at C2 and C3 positions cannot be principally evaluated. This method is a relative method, which requires the total DS value to be determined by another method.
2) The unperturbed end-to-end chain lengths {R^)Q / M ^ ^ ^ of cellulose tributyrate calculated from intrinsic viscosities and molecular weight K(= K^ at theta solvent) (eq. 1)) values using the values of ^ 2 . ^^^ Flory wrote in the same book,^^^ that cellulose tributyrate is exceptional with respect to the effect of temperature in reducing {R^)Q / M ^ ^ ^ . At high temperatures its {R^)Q /{R-^)of ratio {R^)of is {R^)o for chains with free internal rotation is more or less normal, and compliance with viscosity relations set forth above is indicated by the values obtained for K(= [r]]/M^^^) using fractions differing in molecular weight.
E. ^^^ 1A MOLECULAR CHARACTERIZATION OF CELLULOSE 17 A Q ^-^ ^ S Eh: c X o "^ S 3a H a :3 fi m X o T3 13 TS «3 P es o C3 o TJ CQ VH ^ >^ ^ ^> § ^^ ^ ^ PQ £ ffi O 1 ^C '^ ^ o (l> so U (U ^U -^ CN e^ ^ 5 3 ^ > oo is; S 0^ su T3 Z m A ^ I I H