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Paper is a widely used material that is affected by environmental stresses and makes paper prone to damage. The paper is characterized by the absorption of water and moisture due to porosity, We have overcome this problem by employing polymer materials as water-resistant coatings acting as a barrier to protecting the paper, Polymer paper coating forms a clear membrane on the fiber forming a bridge of monomers on the surface of the paper. Two polymer coatings were used as a treatment, namely Polystyrene and sealer (alkyd resin). The results showed the possibility of enhancing the durability of the paper and preserving it from damage and deterioration. The treatment gave a decrease in moisture content, response to abrasion and scratching while increased folding tolerability, the burst strength, tear resistance, hardness compared to untreated paper and the paper porosity important indicator to overcome. The degree of brightness, the degree of color and visible light and ultraviolet radiation [UV] effect of the specimens were studied in detail. [ABSTRACT FROM AUTHOR]

The purpose of this paper is to simulate an accelerated ageing of paper and high density pressboard type B.3.1 in three different liquids (mineral oil MO, natural ester VO and synthetic ester SE) for different periods of ageing at 130°C. The materials were aged in sealed vessels under two different atmospheres: air and nitrogen gaps. The effects of aging on physicochemical properties of oil and cellulose are analyzed and compared. It is shown that ageing rate of pressboard and paper are comparable in each type of oil. Nevertheless, it can be underlined that cellulosic materials are less affected after aging in ester oils evidencing a higher degree of polymerization (DPv). The use of 2-FAL in ester oils remains questionable. The reduction of oxygen content in mineral oil minimizes ageing of oil more than solid insulating materials. [ABSTRACT FROM PUBLISHER]