In order to study the life-expectancy and difference in aging resistant properties of different papers,dry heat aging experiments of different paper samples (paper made from bamboo,Xuan paper,newsprint,dictionary paper and paper made from mulberry) were conducted.The brightness and mechanical strength (tensile strength,tearing resistance and folding endurance) of different papers during aging process were analyzed.Furthermore,the chemical properties (viscosity,copper number and pH) of paper were tested to search the immanent cause of paper ageing.Results indicated that ageing resistance stabilities of different kinds of paper were different.The aging resistant property of paper greatly depended on initial mechanical strength.The decrease of mechanical strength was closely related to the hydrolysis/oxidation of fiber.The pH value of the paper made from bamboo was not quite stable,it is necessary to prevent it from acidification then accelerating aging in long time storage.%为了研究不同纸张的预期寿命及其耐老化性能的差异性,对竹纸、宣纸、新闻纸、字典纸和构皮纸等5种不同纸张进行了模拟干热老化实验.并对老化过程中纸张的白度和机械强度(抗张强度、撕裂度、耐折度)进行了分析检测,通过检测纸张的化学性能(黏度、铜价、pH值)分析了纸张老化的内在原因.结果表明,不同纸张其白度和机械强度的大小及老化稳定性不同;初始机械强度对纸张的耐用性影响很大;纤维素的水解/氧化与纸张机械强度下降关系密切;竹纸pH值稳定性较差,长期保存时需防止其酸化加速文献老化.
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