13C-NMR-spektroskopische Untersuchungen zur Phosphatierung von Celluloseprodukten im System H3PO4/Harnstoff

✍ Scribed by I. Nehls; F. Loth

• Publisher: John Wiley and Sons
• Year: 1991
• Tongue: English
• Weight: 302 KB
• Volume: 42
• Category: Article
• ISSN: 0323-7648
• DOI: 10.1002/actp.1991.010420512

✦ Synopsis

Aiif I3;isis voii gemalilencm Ficli teiisulfitzellstoff, mikrokristalliner Cellulose und Perlcellulosc sowie Carlmxymetliyl. und IIytlr~Jsyetliylcellulose wurdcii iintei~scliictlliclie Cellulosepllospliate hergestcllt und mittels 13C-Ni\IR-Spcktrnsko-Iiio untcrsiicht. Die Pliospliatgruppen wurtlen i n das Cellulosematcrial durch trockcne Erwiirmung niit einer Mischung vnu Pliospliorsiiiirc uncl Marnstoff eingcfiilirt. nci allen nacli tlieseni Vcrfnhren erhaltcnen Prolwn wurtle cinc hevnrzugte Substitution tler C-6-Stellung gefuntlen.

1%; -N h l It apeclroscopic invesligalions on plioxpkorylalion 01 cellrilore prodrtcls in liie sysleni orlhupliosphoric acidlurea

Starting from niilletl spruce sulpliite pulp, microcrystalline cellulose, and bead cellulose as well as carboxymetliyl cc4lulose ant1 hyclroxyctliyl ccllulose different cellulose phosphates have been prepared and investigated by 13C-NMR spectroscopy. I'liospliate groups were iutroclucetl into tlie cellulosc mnterial by dry heating with a mixture of orthopliosphoric acitl and iir(~;i. \Vitli ;ill s;implcs ol)tainetl by h i s procecluw a prcfcrential substitiitioii in the C-6-position wiis ol'scrvc~l.