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- W2394029971 abstract "Hydroxypropyl methyl cellulose succinate(HPMCS) was synthesized from hydroxypropyl methyl cellulose(HPMC) by esterification using succinic anhydride as esterifying agent,anhydrous sodium acetate as catalyst and acetic acid as organic solvent.By varying reaction temperature and the amount of esterifying agent and catalyst,five kinds of HPMCS with the different content of carboxybutyryl groups were prepared.The content of carboxybutyryl groups in HPMCS was determined by conductometric titration.Its structure and properties were analyzed by IR,viscometer and rheometer.The result showed that the number of carboxybutyryl groups per macromolecular chain was from 6.57 to12.42,that the gelation temperature of 1% by weight HPMCS solutions ranged from 48.7℃ to 41.95℃,whereas that of a 1 wt% HPMC solution was 59.85℃ and that with an increase in carboxybutyryl content and distribution homogeneity,its gelation temperature decreased but its gel strength increased." @default.
- W2394029971 created "2016-06-24" @default.
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- W2394029971 date "2007-01-01" @default.
- W2394029971 modified "2023-09-25" @default.
- W2394029971 title "Preparation and Characterization of Hydroxypropyl Methylcellulose Succinate(HPMCS)" @default.
- W2394029971 hasPublicationYear "2007" @default.
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