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Several pharmaceutical grade cellulose ethers, hydroxypropyl methyl cellulose (HPMC), hydroxypropyl cellulose (HPC), hydroxyethyl cellulose (HEC) and ethylhydroxyethyl cellulose (EHEC) have been degraded to different molecular weights by exposing either a 1.5 or 4.0wt.% aqueous solution of the polymer to varying periods of ultrasonic radiation over 24h. The resulting solutions were characterised with...
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