Investigation on the thermodynamic and kinetic parameters in the process of solvents transporting into EPDM crosslinking network at incremental temperatures

IF 2.2 3区工程技术 Q3 CHEMISTRY, PHYSICAL

Journal of Chemical Thermodynamics Pub Date : 2024-12-20 DOI:10.1016/j.jct.2024.107435

Zhuozhuo Li, Guangyong Liu

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引用次数: 0

Abstract

The transport properties of cyclohexane, p-xylene and cyclohexanone in Ethylene Propylene Diene Monomer (EPDM) were determined by equilibrium swelling method, and the effects of temperature on the diffusion (D), adsorption (S) and permeation (P) behaviors were investigated. The results showed that the diffusion behaviors of cyclohexane, p-xylene and cyclohexanone in EPDM crosslinking network were not only related to the compatibility but also more significantly affected by temperature, and the swelling mechanism of EPDM crosslinking network was inferred. Fick diffusion contribution index (K_f) was obtained by Peppas-Sahlin model, and the D and P values of the three EPDM swelling systems could be correlated by the same D ∼ K_f relationship and P ∼ K_f relationship, respectively. The temperature dependance of the D and P values of EPDM/cyclohexane and EPDM/p-xylene system was less at low-temperature and higher above 35 ℃. The diffusion (E_D) and permeation activation energies (E_P) determined for the EPDM/p-xylene swelling system showed the lowest values, corresponding to the highest D and P values, that is, the diffusion and permeation of p-xylene in EPDM was very fast. This work can provide an important guiding significance for evaluating the liquid resistance of EPDM-based industrial and automotive rubber products.

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升温条件下溶剂进入三元乙丙橡胶交联网络的热力学和动力学参数研究

采用平衡溶胀法测定了环己烷、对二甲苯和环己酮在三元乙丙橡胶（EPDM）中的输移性质，考察了温度对扩散(D)、吸附(S)和渗透(P)行为的影响。结果表明，环己烷、对二甲苯和环己酮在EPDM交联网络中的扩散行为不仅与相容性有关，而且受温度的影响更为显著，推断了EPDM交联网络的溶胀机理。通过Peppas-Sahlin模型得到Fick扩散贡献指数（Kf）， 3种EPDM溶胀体系的D和P值可以分别用相同的D ~ Kf关系和P ~ Kf关系进行关联。EPDM/环己烷体系和EPDM/对二甲苯体系的D和P值在低温下的温度依赖性较小，在35℃以上的温度依赖性较大。EPDM/对二甲苯溶胀体系的扩散活化能（ED）和渗透活化能（EP）最小，对应的D和P值最高，即对二甲苯在EPDM中的扩散和渗透速度非常快。该工作可为epdm基工业及汽车橡胶制品的耐液性评价提供重要的指导意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Chemical Thermodynamics 工程技术-热力学

CiteScore

5.60

自引率

15.40%

发文量

199

审稿时长

79 days

期刊介绍： The Journal of Chemical Thermodynamics exists primarily for dissemination of significant new knowledge in experimental equilibrium thermodynamics and transport properties of chemical systems. The defining attributes of The Journal are the quality and relevance of the papers published. The Journal publishes work relating to gases, liquids, solids, polymers, mixtures, solutions and interfaces. Studies on systems with variability, such as biological or bio-based materials, gas hydrates, among others, will also be considered provided these are well characterized and reproducible where possible. Experimental methods should be described in sufficient detail to allow critical assessment of the accuracy claimed. Authors are encouraged to provide physical or chemical interpretations of the results. Articles can contain modelling sections providing representations of data or molecular insights into the properties or transformations studied. Theoretical papers on chemical thermodynamics using molecular theory or modelling are also considered. The Journal welcomes review articles in the field of chemical thermodynamics but prospective authors should first consult one of the Editors concerning the suitability of the proposed review. Contributions of a routine nature or reporting on uncharacterised materials are not accepted.