Characteristic analysis and evaluation model of thermal aging of paper based on thermogravimetry

被引：1

作者：

机构：

[1] State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, Guangdong

来源：

Chen, G. (papercg@scut.edu.cn) | 2012年 / South China University of Technology卷 / 40期

关键词：

Activation energy; Evaluation model; Paper; Thermal aging; Thermogravimetry;

D O I：

10.3969/j.issn.1000-565X.2012.01.004

中图分类号：

学科分类号：

摘要：

In this paper, first, an accelerated thermal aging of paper was carried out, and the corresponding pyro-lysis process was analyzed via the thermogravimetry. Then, the thermogravimetric characteristics of the paper during the aging were investigated, finding that the weight loss in the pyrolysis process contains two stages, namely the dehydration of paper and the weight loss caused by cellulose pyrolysis. TG kinetic analysis shows that the nonageing paper has the lowest activation energy, that the activation energy first increases and then decreases during the aging, and that, with the increases in aging time and temperature, the thermal stability of paper degrades, the temperature corresponding to a pyrolysis conversion rate of 0.5, namely θ 0.5, gradually decreases, while the gap Δθ 0.5 between the θ 0.5 values of aging and nonageing paper progressively increases. Moreover, it is found that there is a quantitative exponential relationship between the relative polymerization degree DP/DP 0 and Δθ 0.5, which means that Δθ 0.5 can be used as a parameter to evaluate the aging degree of paper. Based on the above-mentioned fin-dings, a model to rapidly and quantitatively evaluate the paper aging can be established by means of thermogravimetry, which is proved effective by the accordance between the evaluated and the experimental results.

引用

页码：19 / 23+29

共 13 条

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