By Jett C. Arthur
content material: Crystal buildings of oligocellulose acetates and cellulose acetate 2 / R.H. Marchessault and H. Chanzy --
A digital bond modeling learn of cellulose 1 / Alfred D. French and Vincent G. Murphy / experiences on polymorphy in cellulose : cellulose IV and a few results of temperature / Rajai H. Atalla, Bruce E. Dimick, and Seelye C. Nagel --
buildings of local and regenerated celluloses / John Blackwell, Francis J. Kolpak, and Kenncorwin H. Gardner --
X-ray diffraction via bacterial capsular polysaccharides : trial conformations for klebsiella polyuronides K5, K57, and K8 / E.D.T. Atkins, K.H. Gardner, and D.H. Isaac --
X-ray diffraction stories of heparin conformation / I.A. Nieduszynski, K.H. Gardner, and E.D.T. Atkins --
Hyaluronic acid conformations and interactions / W.T. wintry weather, J.J. Cael, P.J.C. Smith, and Struther Arnott / reports at the crystalline constitution of [beta]-D-(1 [yields] 3)-glucan and its triacetate / Terry L. Bluhm and Anatole Sarko --
Conformation and packing research of polysaccharides and derivatives : exact refinement of trimethylamylose / P. Zugenmaier, A. Kuppel, and E. Husemann --
good nation conformations and interactions of a few branched microbial polysaccharides / Ralph Moorhouse, Malcolm D. Walkinshaw, William T. wintry weather, and Struther Arnott --
adjustments in cellulose constitution in the course of manufacture and changing of paper / E.L. Akim --
Characterization of cellulose and artificial fibers by way of static and dynamic thermoacoustical recommendations / Pronoy ok. Chatterjee --
Heat-induced alterations within the houses of cotton fibers / S.H. Zeronian --
Infrared and Raman spectroscopy of cellulose / John Blackwell --
Teichoic acids : facets of constitution and biosynthesis / I.C. Hancock and J. Baddiley --
Secondary lignification in conifer timber / Herbert L. Hergert --
Electron donor homes of tertiary amines in cellulose anion exchangers / Dorothy M. Perrier and Ruth R. Benerito --
Pyrolysis of cellulose after chlorination or addition of zinc chloride / Yuan Z. Lai, Fred Shafizadeh, and Craig R. McIntyre --
A speculative photo of the delignification approach / D.A.I. Goring --
Non-aqueous solvents of cellulose / Burkart Philipp, Harry Schleicher, and Wolfgang Wagenknecht --
results of solvents on graft copolymerization of styrene with [gamma]-irradiated cellulose / Yoshio Nakamura and Machiko Shimada --
interplay of radiation with cellulose within the stable kingdom / Glyn O. Phillips, P.J. Baugh, J.F. McKellar, and C. Von Sonntag --
Grafting of monomers to cellulose utilizing UV and gamma radiation as initiators / John L. Garnett --
a few organic services of matrix parts in benthic algae in terms of their chemistry and the composition of seawater / Inger-Lill Andresen, Olav Skipnes, Olav Smidsrød, Kjetill Ostgaard, and according to Chr. Hemmer --
where of cellulose less than strength shortage / Irving S. Goldstein.
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ATALLA ET AL. Polymorphy in Cellulose 37 methylol s u b s t i t u e n t the p r e c i p i t a t e d c e l l u l o s e was more ordered, as i n d i c a t e d by the d i f f r a c t o g r a m shown i n F i g . 7 which i s t y p i c a l of h i g h l y ordered c e l l u l o s e IV samples. In t h i s connection i t should a l s o be noted that p r e p a r a t i o n of c e l l u l o s e IV by r e g e n e r a t i o n from s o l u t i o n i s n o v e l . Previous r e p o r t s of i t s p r e p a r a t i o n have been based on treatment of c e l l u l o s e s I or I I at temperatures i n the range l80-250°C i n g l y c e r o l (i).
2 and U, the IV polymorph dominates and there i s no evidence f o r separate p r e c i p i t a t i o n o f t h e I I polymorph. U l t i m a t e l y , f o r a low enough DP and l60°C t h e molecular chains separate e n t i r e l y i n the I conformation and t h e c r y s t a l l i n e form i s t h a t o f the n a t i v e c e l l u l o s e I s t a t e , F i g . 2 and k. The i n t e r p r e t a t i o n set f o r t h above f o r t h e present observa t i o n s concerning t h e p r e p a r a t i o n o f c e l l u l o s e IV by p r e c i p i t a t i o n from s o l u t i o n can a l s o be r e c o n c i l e d with the r e s u l t s o f past preparations o f c e l l u l o s p r e v i o u s l y r e p o r t e d (χ,ΐΐ i n g l y c e r o l o r water under pressure a t temperatures i n the range l80-250°C.
3. Atalla, R. H. and Nagel, S. , Science 158, 522(1974). 4. Johnson, D. , Nicholson, M. , and Haigh, F. C. Proceedings of the Eighth Cellulose Conference, May, 1975. In press. 5. Swenson, Η. , Proceedings of the Eighth Cellulose Conference, May, 1975 6. Atalla, R. H. and Nagel, S. , Chem. , 1049(1972). 7· Ellefsen, O. and Tonnesen, Β. , in Ν. M. Bikales and L. , Cellulose and Cellulose Derivatives, (High Polymers, Vol. 5, Part IV), Interscience, New York, 1971. p. 151. 8. Tripp, V. W. and Conrad, C.
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