基于热重法的纸张热老化特性分析及其评价模型

华南理工大学学报(自然科学版) ›› 2012, Vol. 40 ›› Issue (1): 19-23,29.

基于热重法的纸张热老化特性分析及其评价模型

陈港刘玉莎文艾何北海

华南理工大学制浆造纸工程国家重点实验室，广东广州 510640

收稿日期:2011-05-24 修回日期:2011-07-04 出版日期:2012-01-25 发布日期:2011-12-01
通信作者: 陈港(1967-) ，男，教授，主要从事特种纸与功能纸制品研究． E-mail:papercg@ scut.edu.cn
作者简介:陈港(1967-) ，男，教授，主要从事特种纸与功能纸制品研究．
基金资助:
国家“973”计划项目( 2010CB732206) ; 广东省产学研结合项目( 2010B09040031) ; 粤港关键领域重点突破项目( 200849834)

Characteristic Analysis and Evaluation Model of Thermal Aging of Paper Based on Thermogravimetry

Chen Gang Liu Yu-sha Wen Ai He Bei-hai

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

Received:2011-05-24 Revised:2011-07-04 Online:2012-01-25 Published:2011-12-01
Contact: 陈港(1967-) ，男，教授，主要从事特种纸与功能纸制品研究． E-mail:papercg@ scut.edu.cn
About author:陈港(1967-) ，男，教授，主要从事特种纸与功能纸制品研究．

摘要/Abstract

摘要： 对纸张进行人工加速热老化，利用热重分析法( TG) 对纸张热解过程进行分析，探讨了纸张在老化过程中的热失重特性．结果表明，纸张热解失重过程可分为纸张失水和纤维素热裂解失重两个阶段． TG 动力学分析表明: 未老化纸张的活化能最小，随着老化程度的加剧，活化能先增大后减小; 随老化时间的延长和老化温度的升高，纸张的热稳定性变差，纸张热解转化率达0. 5 时的温度( θ_0.5) 逐步下降，纸张老化前后的θ_0.5 差值( Δθ_0.5 )逐步变大; 纸张聚合度相对值( DP /DP₀) 与Δθ_0.5 存在指数量化关系，因此Δθ_0.5 可作为衡量纸张老化程度的一个参量．利用TG 建立了一个快速量化评价纸张老化的模型，检验结果显示所得模型与实验数据吻合很好，模型具有较好的预测性．

关键词: 纸张, 热老化, 热重分析法, 活化能, 评价模型

Abstract:

In this paper,first,an accelerated thermal aging of paper was carried out,and the corresponding pyrolysis 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_0.5between 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 /DP₀ 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 findings,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.

Key words: paper, thermal aging, thermogravimetry, activation energy, evaluation model

中图分类号:

TS761

陈港刘玉莎文艾何北海. 基于热重法的纸张热老化特性分析及其评价模型[J]. 华南理工大学学报(自然科学版), 2012, 40(1): 19-23,29.

Chen Gang Liu Yu-sha Wen Ai He Bei-hai. Characteristic Analysis and Evaluation Model of Thermal Aging of Paper Based on Thermogravimetry[J]. Journal of South China University of Technology(Natural Science Edition), 2012, 40(1): 19-23,29.

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