Effect　of　Hydrophilic　Polymers　on　Degradation　Behavior　of　Cellulose　Acetate　by　Phosphoric　Acid

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  • 親水性ポリマーがリン酸によるセルロースアセテートの分解挙動に及ぼす影響

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The biodegradation behavior of cellulose acetate (CA; DS=2.5) films/fibers containing orthophosphoric acid (PA) was examined by a laboratory soil burial test.It was observed that the biodegradation rate of the CA films/fibers containing PA increased in comparison with that of the control CA films/fibers.In storage (relative humidity: 60%), the formation of acetic acid and the decrease in the DS, indicating the deacetvlation of CA, were observed in the case of CA containing PA.In the case of the CA-PA-polyvinylpyrrolidone (PVP) composite, the biodegradation rate was well in agreement with that of the CA containing PA.Further, the emission of acetic acid caused by the deacetylation of CA was inhibited in storage.An infrared (IR) analys is suggested that PA interacted with the acetyl group of CA in the CA-PA composite.On the other hand, in the CA-PA-PVP composite, PA interacted with the carbonyl group of PVP in preference to CA.In a water-rich environment, PA functioned as an acid catalyst, and the DS of the CA component decreased.

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