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 contemporary advancements, with specific connection with cellulose (in aqueous alkali) and cellulose acetate. filled with examples, the writer takes an in-depth examine the subject, utilizing the main trustworthy experimental facts on hand. A finished method of the elemental rules of cellulose and its derivatives in resolution makes Cellulose and Cellulose Derivatives excellent examining for newbies in addition to skilled cellulose scientists.

* Outlines the theoretical basics of cellulose and cellulose derivatives
* offers entire and trustworthy experimental ends up in figures and tables
* hugely illustrated and simple to learn

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Additional info for Cellulose and Cellulose Derivatives: Molecular Characterization and Its Applications: Molecular Characterization and Its Application (Polymer Science Library)

Example text

2a). We recorded the resonance frequencies as the decoupling frequency of low-power selective spin, decoupling method. 3c shows the experimental results. In spectrum c-i, c-ii, and c-iii. A, C, and D peaks of the acetyl methyl proton are selectively decoupled. 3c shows that each a, d, and c peak becomes sharp by applying the low-power selective spin decoupling method to each A, C, and D peak. Thus, we can conclude that a one-to-one correspondence exists between the acetyl methyl proton peak and the carbonyl carbon peak as follows: A —• a, C —^ d, and D —• c.

7 ppm seem to be derived from C^, C3, and C2 monosubstituted glucopyranose units. These spectra for CA obtained here are much better resolved than those reported by Kamide and Okajima^ and Miyamoto et alJ The lower resolution of the spectra might have permitted the division of the carbonyl carbon peak region into three major peaks. 6 was impossible. 3 ppm to the 0-acetyl carbonyl carbons in C^, C2, and C3 positions. 89, and ((/s)) — 1 02 when calculated from peak area ratios. It is clear that the hydroxyl group in the C3 position is less reactive than those in the C(, and C2 positions.

In this case, A was first taken as 166 ms (= 1 / ( 4 / C - C - H ) . JC-C-U is the long-range C-H coupling constant), but the signal was extremely weak to obtain a sufficiently large signal noise (S/N) ratio due to the remarkably short (<50 ms) spin-spin relaxation time T2. We then chose an adequate 44 2. " value of Zi, determined by trial and error under the conditions of Zi < 50 ms. The exponential and trapezoidal windows were employed for t2C^C) and ^i(^H), respectively. We demonstrated 2D spectra by a stacked plot and plane figures were constructed by taking into consideration the ID spectra of cross sections.

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