糖醇类相变材料热稳定性研究进展

Research progress in thermal endurance of sugar alcohols phase change materials

糖醇类普遍具有较高的熔化焓值,比起常用无机和其他有机材料综合性能凸显而被作为中温相变候选材料备受关注。但是目前糖醇类作为相变材料在工程实际应用却很少,其主要原因除了过冷度大,导热性能低以外,糖醇类熔化焓的热稳定性是决定其应用的关键基础因素,而之前多数研究对此关注度不够。因此,重点围绕对糖醇类熔化焓热稳定性的相关研究,阐述了糖醇类熔化焓在储热过程中衰减的原因,相关机理分析,提升熔化焓热稳定性的方法,熔化焓动力学预测模型对熔点调控延长糖醇类相变材料预期使用寿命的相关研究进展,为重新评估糖醇类作为相变材料的适用性提供了思路和方法,也为糖醇类实现工业应用提供了研究方向。

Sugar alcohols as a type of intermediate temperature phase change materials(PCMs)have been attracted considerable attention in thermal storage for their good comprehensive performances comparing that with inorganic and other organic materials base on their higher fusion enthalpy.However,there are few industrial applications of sugar alcohols as PCMs at present.The main reasons except their ubiquitous defects,such as severe supercooling,relative low thermal conductivity,the thermal endurance of the fusion enthalpy is a key fundamental factor in their practical application,which is little attention paid to that by most of previous studies.In this article,the research progress in focusing on thermal endurance of the enthalpy for sugar alcohols,such as the causes of degradation,related mechanism,experimental measures for improvement,kinetics-predictive model and melting point regulation for lifetime expectancy were reviewed in recent years.It provides ideas and methods for reevaluating the feasibility of sugar alcohols as PCMs,and also provides a research direction for their practical application.