Accelerated aging : photochemical and thermal aspects

Accelerated aging : photochemical and thermal aspects

Robert L. Feller ; [ed.: Dinah Berland]

[Marina del Rey, CA.]

1994

XIV, 275 p

ill

28 cm

boek

Research in conservation; 4

0892361255

So-called accelerated-aging tests are carried out for three major purposes. The first is to establish in a conveniently short time the relative ranking of materials, or physical combinations of materials, with respect to their chemical stability or physical durability. The second is to estimate or “predict” potential long-term serviceability of material systems under expected conditions of use. Thirdly, processes of deterioration are speeded up in the laboratory in order to elucidate the chemical reactions involved (the “mechanism” of the degradation) and the physical consequences thereof. An important facet of this effort is the disclosure of the overall pattern of deterioration, that is, whether the processes accelerate in time, whether there is an induction period, or whether a number of distinct stages are observable before failure occurs. The ultimate objective of this third area of investigation is the development of techniques that can monitor the extent of degradation and methods by which the useful lifetime of materials can be extended. These three major objectives are cited in the approximate
order of the ease in which they can be achieved.

Met lit. opg

fotochemie, veroudering