Newsprint degradation

Figure 1. Percent change in tensile strength vs. time at 90°C, 100% RH, for (O) not buffered and for (X) buffered newsprint. The relative rate of degradation, kr, is estimated as the ratio of the slopes.

Figure 6. Relative rate of (O) tensile strength change and (X) yellowing vs. relative acid concentration for newsprint paper degradation at 90°C, 100% RH, in an air atmosphere...

Both papers used in this study were manufactured commercially. The newsprint was a typical groundwood sheet, and the rag paper was made from 100% cotton linters. The data in Table II show the properties of the two papers prior to accelerated degradation. 

In the experiments described above, accelerated degradation occurred at 90°C in an atmosphere maintained at 100% relative humidity. Under this condition, both the oxygen-independent and the atmospheric oxidation processes contributed about equally to the degradation of the rag and newsprint papers. The 100% relative humidity condition allowed an examination of the influence of acidity on both processes, but whether... 

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