ISSN:
0887-624X
Schlagwort(e):
oligodihexanoylchitin
;
selective acid hydrolysis
;
block copolymer
;
poly (propylene glycol)
;
4,4'-methylenedi (phenyl isocyanate)
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
The preparation of oligodihexanoylchitin (3) having hydroxy groups at the both ends was carried out by an acid hydrolysis of a parent dihexanoylchitin in a mixed solution of acetic acid and conc. hydrochloric acid (11 : 1 in volume) at a room temperature. After 13-21 h, the products were isolated and their molecular weights were calculated as 7400-1100 by GPC analyses. The structure of the product 3 was determined by 1H and 13C-NMR and IR spectra. The IR spectra of the products yielded for longer hydrolysis times than 30 h, however, indicated the occurrence of the dehexanoylation. The block copolymerization of 3 with poly (propylene glycol) (PPG) using 4,4'-methylenedi (phenyl isocyanate) (MDI) as a coupling reagent gave the block copolymer 6. The molecular weight of 6 as obrained by GPC was 52,000. © 1994 John Wiley & Sons, Inc.
Zusätzliches Material:
4 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/pola.1994.080321402
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