Biodegradation behavior of acid‐containing cellulose acetate film in soil

Abstract

The biodegradation behavior of various cellulose acetate (CA; degree of substitution = 2.5) films that contain acids was examined by a laboratory soil burial test to clarify the effects of additives on the biodegradability of CA. The biodegradation rate of the CA films containing polyphosphoric acid, phosphoric acid, and p‐toluenesulfonic acid increased compared to that of the nonadditive CA film. CA films containing mandelic acid and maleic acid showed a small tendency to increase. Conversely, CA films containing adipic acid did not affect the biodegradability of CA. A similar experiment was carried out with a sterilization system. The acid‐containing CA film, which showed an accelerated biodegradation rate, was chemically deacetylated by contact with water in the environment and was consequently converted to a lower degree of acetyl group substitution matter that had higher biodegradability. An IR analysis suggested that this deacetylating ability of acids is correlated with the intensity of their interaction with the acetyl group of CA. In the biodegradation process, the contact efficiency of acids to CA was considerably lowered by the elution of internal acids with time. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 466–473, 2005

Evaluation of Organic Hydride Donors as Reagents for the Reduction of Carbon Dioxide and Metal-Bound Formates

“…Estimated carbonyl stretching frequencies for the formate groups were available from our DFT calculations and were corrected with a vibrational scaling factor of 1.0337 . The resulting carbonyl stretching frequencies matched well with those experimental frequencies that were directly available. ,, Figure presents a plot of the calculated ν̃(CO) stretching frequencies against the Gibbs free energy change for the reaction of the formato species with the representative OHD, 1,2-dihydropyridine ( 6 ), in water. There is a good linear relationship between ν̃(CO) and the Δ G xrn ( R 2 = 0.97).…”

Degradation of Cellulose Acetate-Based Materials: A Review

“…To be successful, the overall formulation may have decomposition accelerating agents combined with a reaction controlling agent, which stabilizes the material before disposal. Yamashita evaluated the addition of using various acids to CA films for enhancing the biodegradation [76]. In US Patent 6,571,802 Yamashita proposed combining the acid with a stabilizing agent which releases the acid upon contact with water, thus preventing the additives from deacetylating the CA and generating acetic acid before disposal [77].…”

Thermal hazard and reaction mechanism of the preparation of adipic acid through the oxidation with hydrogen peroxide

“…The peak at 1,694.21 cm −1 was attributed to the symmetrical stretching vibration of the CO group, the peak at 1,428.01 cm −1 was attributed to the in‐plane bending vibration of the COH group, and the peak at 1,408.03 cm −1 was attributed to the variable angle vibration of the α‐CH2 group. The band at 1,278.68 cm −1 corresponded to the stretching vibration of the COH group, and the band at 926.81 cm −1 corresponded to the out‐of‐plane bending vibration of the COH group 32‐34 . By comparing the FTIR spectra of the pure adipic acid and the reaction product, the product of the catalytic oxidation was determined to be adipic acid.…”