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>Dynamic viscoelastic properties in the molten state for cellulose acylates and (cellulose oligo‐oxymethylene ether) acylates
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Dynamic viscoelastic properties in the molten state for cellulose acylates and (cellulose oligo‐oxymethylene ether) acylates
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机译：Dynamic viscoelastic properties in the molten state for cellulose acylates and (cellulose oligo‐oxymethylene ether) acylates
AbstractThe dynamic viscoelastic properties of cellulose acylates, its mixed acylates, and (cellulose oligo‐oxymethylene ether) acylates (COM acylates) have been meausured in the molten state over wide ranges of frequency and temperature. The logG′vs. log ω curves as well as the similar curves for the loss modulusG′at various temperatures for cellulose acylates could not be superposed into respective master curves by use of the time–temperature superposition principle. This is considered to be caused from the orientation of cellulose acylates main chain in the molten state. In the case of cellulose mixed acylates, rheological simplicity was found but this was only the case on selected combinations of acyl groups. Most cellulose acylates, which were introduced oxymethylene chains (OM chains) in between glucopyranose ring and the acyl group, behaved as thermorheologically simple materials in the molten state. When the acyl groups become large, however, it is necessary to introduce long OM chains in order to get thermorheologically simple COM acylates in their molten state. Several studies have been made concerning the behavior of side chains, both the OM and the acyl chains, of COM acylates in the molt
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