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Cellulose triacetate prepared from low‐grade hardwood dissolving pulp and its insoluble residues in acetylation mediums
Author(s) -
Saka Shiro,
Takanashi Keiko
Publication year - 1998
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19980110)67:2<289::aid-app11>3.0.co;2-u
Subject(s) - cellulose triacetate , acetic anhydride , dissolving pulp , cellulose , dissolution , hardwood , pulp (tooth) , acetic acid , sulfuric acid , chemistry , residue (chemistry) , solvent , dichloroacetic acid , softwood , organic chemistry , polymer chemistry , nuclear chemistry , materials science , composite material , catalysis , botany , medicine , pathology , biology
As cellulose triacetate is prepared from low‐grade hardwood dissolving pulp, a considerable amount of the insoluble residue was present in the acetylation medium of the acetic acid/acetic anhydride/sulfuric acid system. The characterization of this residue indicated that the insoluble residue is composed of cellulose triacetate and xylan diacetate, retaining a fiber structure of swollen form. To reduce the insoluble residues, reaction conditions for acetylation were investigated. As one of the remedies of reducing the insoluble residues, 17 different solvents were selected to add to the acetylation medium, and among these, dichloroacetic acid was found to be very effective for its reduction. The obtained cellulose triacetate could then reveal good thermal properties similar to that from high‐grade dissolving pulps. Therefore, acetylation systems with an addition of an appropriate solvent can have a potential to industrially manufacture a high‐quality cellulose triacetate from even low‐grade hardwood‐dissolving pulps, as observed in low‐grade softwood‐dissolving pulps. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67: 289–297, 1998