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Title
Kinetic dependences for the decrease of polymerization of paper undergoing accelerated ageing
Authors
MICHAL JABLONSKY JANA KAZIKOVA MARTINA BOTKOVA and SILVIA HOLUBKOVA
Received
May 15, 2011
Published
Volume 46, Issue 9-10 November-December
Keywords
deacidification, efficacy, degradation, ageing
Abstract
Degradation of cellulose is an important factor influencing its physical, mechanical, optical and chemical properties
and the lifetime of paper in libraries and archival holdings. Groundwood paper made around the middle of the 19th
century is endangered. Documents in poor condition need treatment to prolong their lifespan for the use of future
generations.
To investigate the ageing stability, model groundwood newsprint paper was used. A study of the accelerated ageing of
newsprint paper was performed at 98 °C during 0, 1, 2, 3, 5 ,7, 10, 15, 20 and 30 days. The efficacy of treatment using
MgO in perfluoralkanes or a mixture dispersion of MgO in perfluoralkanes and methyl methoxy magnesium carbonate
in methanol (ratio 3:1) was investigated. This paper aims at finding kinetic dependences for the degree of
polymerization (further DP) decrease and time stability of pH value of paper undergoing accelerated ageing. The
highest rate of degradation (kDP = 0.0105 ± 0.0023 h-1) was determined for the unmodified control sample. In the case
of the treated samples, the rate constants of DP degradation were lower (kDP = 0.0073 ± 0.0010 h-1 and kDP = 0.0053 ±
0.0009 h-1) for samples treated by MgO and MgO+MMMC, respectively.
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