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Photodegradation of polyethylene films formulated with a titanium‐based photosensitizer and titanium dioxide pigment

1994; Wiley; Volume: 53; Issue: 7 Linguagem: Inglês

10.1002/app.1994.070530702

1097-4628

J.L. Angulo-Sánchez, H. Ortega‐Ortiz, S. Sánchez‐Valdés,

Polymer Science and PVC

Abstract This work reports on the photodegradation of low‐density polyethylene films formulated with titanium (IV) oxide actylacetonate (TAc) and titanium dioxide pigment in different proportions; no previous reports on the photoactivity of this acetylacotonate have been found. Samples of blow‐extruded films were submitted to accelerated UV aging with fluorescent lamps and the polymer degradation measured. The changes in carbonyl groups, molecular weight, and film elongation at break are discussed. The results show that TAc can promote photooxidation and accelerate the film degradation. The retention percent of elongation at break ( E B ) is apparently proportional to the carbonyl index irrespective of the formulation but has different relations with molecular weight ( M n ), time, or the number of chain scissions ( n ), probably as a result of microstructural differences. © 1994 John Wiley & Sons, Inc.