Institute of Macromolecular Compounds, Russian Academy of Sciences, Bolshoi Prospect V.O. 31, 199004 St. Petersburg, Russia.
A.V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Leninsky Pr. 29, 119991 Moscow, Russia.
Molecules. 2023 Jan 18;28(3):949. doi: 10.3390/molecules28030949.
The low thermal conductivity of paraffin and other organic phase change materials limits their use in thermal energy storage devices. The introduction of components with a high thermal conductivity such as graphene into these materials leads to an increase in their thermal conductivity. In this work, we studied the use of inexpensive carbon fillers containing a polycyclic aromatic core, due to them having a structural similarity with graphene, to increase the thermal conductivity of paraffin. As such fillers, technogenic asphaltenes isolated from ethylene tar and their modified derivatives were used. It is shown that the optimal concentration of carbon fillers in the paraffin composite, which contributes to the formation of a structural framework and resistance to sedimentation, is 5 and 30 wt. %, while intermediate concentrations are ineffective, apparently due to the formation of large aggregates, the concentration of which is insufficient to form a strong framework. It has been found that the addition of asphaltenes modified with ammonium persulfate in acetic acid significantly increases the thermal conductivity of paraffin by up to 72%.
石蜡和其他有机相变材料的低热导率限制了它们在热能存储装置中的应用。在这些材料中引入具有高热导率的成分，如石墨烯，会导致其热导率增加。在这项工作中，我们研究了使用含有多环芳烃核心的廉价碳填料来提高石蜡的热导率，因为它们与石墨烯具有结构相似性。作为这种填料，使用了从乙烯焦油中分离出来的技术沥青及其改性衍生物。结果表明，在石蜡复合材料中，有助于形成结构框架和抗沉降的最佳碳填料浓度为 5wt.%和 30wt.%，而中间浓度则无效，显然是因为形成了大的聚集体，其浓度不足以形成强框架。研究发现，在醋酸中用过硫酸铵改性的沥青的添加可使石蜡的热导率提高 72%。
