Photodegradation of cellulose acetate film in the presence of benzophenone as a photosensitizer

To study the effectiveness of photosensitizers to accelerate the degradation of cellulose acetate (CA) under ambient environment, CA (degree of substitution = 2.45) films containing benzophenone, which is one of the typical photosensitizers, were prepared and their degradative behavior by photoirradiation was examined. Decrease in molecular weight of CA and generation of carbon dioxide, carbon monoxide, and acetic acid from the CA films were observed by the irradiation of xenon arc lamp light, which was passed through a filter for cutting off the wavelength shorter than 275 nm. With increasing the concentration of benzophenone, the molecular weight of CA decreased and the generation of the degradation products from the CA films increased. These results may suggest that radical reactions of CA films proceed by photoirradiation and lead to oxidation and random cleavage of CA, and that benzophenone is an effective additive to accelerate the degradation of CA under ambient environment. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007

[1]  T. Endo,et al.  Degradative Behaviour of Cellulose Acetate Film in the Presence of Photoacid Generator , 2006 .

[2]  R. Advíncula,et al.  Polymer thin film photodegradation and photochemical crosslinking: FT-IR imaging, evanescent waveguide spectroscopy, and QCM investigations , 2005 .

[3]  Thomas Heinze,et al.  4.2 Chemical characteristics of cellulose acetate , 2004 .

[4]  B. Saake,et al.  4.3 Degradation and modification of cellulose acetates by biological systems , 2004 .

[5]  T. Endo,et al.  Effect of Hydrophilic Polymers on Degradation Behavior of Cellulose Acetate by Phosphoric Acid , 2004 .

[6]  M. Ike,et al.  Effect of UV irradiation on enzymatic degradation of cellulose acetate , 2002 .

[7]  H. Kaczmarek,et al.  Photoinitiated degradation of polystyrene in the presence of low-molecular organic compounds , 2000 .

[8]  Charles Michael Buchanan,et al.  Biodegradation of radiolabeled cellulose acetate and cellulose propionate , 1993 .

[9]  R. Gross,et al.  Degradation and mineralization of cellulose acetate in simulated thermophilic compost environments , 1993 .

[10]  R. Gross,et al.  Cellulose acetate biodegradability upon exposure to simulated aerobic composting and anaerobic bioreactor environments , 1993 .

[11]  Charles Michael Buchanan,et al.  Aerobic biodegradation of cellulose acetate , 1993 .

[12]  W. L. Liu,et al.  Benzophenone-sensitized photodegradation of polystyrene films under atmospheric conditions , 1992 .

[13]  H. Friebolin,et al.  Partiell acetylierte cellulose — synthese und bestimmung der substituentenverteilung mit hilfe der 1H NMR-spektroskopie , 1991 .

[14]  H. Kubota,et al.  Benzophenone-sensitized photodegradation of polyethylene , 1989 .

[15]  T. Takeuchi,et al.  Photodegradation of polystyrene and polystyrene containing benzophenone , 1983 .

[16]  J. Fouassier,et al.  Photochemical investigations into cellulosic materials, IV. Photosensitized free radical generation in cellulose acetate and oligosaccharide compounds , 1982 .

[17]  J. Fouassier,et al.  Photochemical investigations into cellulosic materials I. Free radical generation in cellulose by photosensitized excitation , 1980 .

[18]  L. J. Taylor,et al.  Accelerated photo‐oxidation of polyethylene. I. Screening of degradation‐sensitizing additives , 1977 .

[19]  N. Hon.  Photodegradation of cellulose acetate fibers , 1977 .

[20]  V. W. Goodlett,et al.  Characterization of cellulose acetates by nuclear magnetic resonance , 1971 .

[21]  J. Jortner.  Photochemistry of cellulose acetate , 1959 .