Spinelli Giovanni, Guarini Rosella, Kotsilkova Rumiana, Batakliev Todor, Ivanov Evgeni, Romano Vittorio
Faculty of Transport Sciences and Technologies, University of Study "Giustino Fortunato", Via Raffaele Delcogliano 12, 82100 Benevento, Italy.
Open Laboratory on Experimental Micro and Nano Mechanics, Institute of Mechanics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Block 4, 1113 Sofia, Bulgaria.
Materials (Basel). 2022 Jan 27;15(3):986. doi: 10.3390/ma15030986.
Overheating effect is a crucial issue in different fields. Thermally conductive polymer-based heat sinks, with lightweight and moldability features as well as high-performance and reliability, are promising candidates in solving such inconvenience. The present work deals with the experimental evaluation of the temperature effect on the thermophysical properties of nanocomposites made with polylactic acid (PLA) reinforced with two different weight percentages (3 and 6 wt%) of graphene nanoplatelets (GNPs). Thermal conductivity and diffusivity, as well as specific heat capacity, are measured in the temperature range between 298.15 and 373.15 K. At the lowest temperature (298.15 K), an improvement of 171% is observed for the thermal conductivity compared to the unfilled matrix due to the addition of 6 wt% of GNPs, whereas at the highest temperature (372.15 K) such enhancement is about of 155%. Some of the most important mechanical properties, mainly hardness and Young's modulus, maximum flexural stress, and tangent modulus of elasticity, are also evaluated as a function of the GNPs content. Moreover, thermal simulations based on the finite element method (FEM) have been carried out to predict the thermal performance of the investigated nanocomposites in view of their practical use in thermal applications. Results seem quite suitable in this regard.
过热效应是不同领域中的一个关键问题。基于导热聚合物的散热器具有轻质、可模塑的特性以及高性能和可靠性，是解决此类不便的有前途的候选材料。目前的工作涉及对由聚乳酸（PLA）增强的纳米复合材料的热物理性质的温度效应进行实验评估，其中聚乳酸用两种不同重量百分比（3 wt%和6 wt%）的石墨烯纳米片（GNPs）进行增强。在298.15至373.15 K的温度范围内测量热导率、扩散率以及比热容。在最低温度（298.15 K）下，由于添加了6 wt%的GNPs，与未填充的基体相比，热导率提高了171%，而在最高温度（372.15 K）下，这种增强约为155%。还评估了一些最重要的力学性能，主要是硬度和杨氏模量、最大弯曲应力以及弹性切线模量，作为GNPs含量的函数。此外，鉴于所研究的纳米复合材料在热应用中的实际用途，基于有限元方法（FEM）进行了热模拟，以预测其热性能。在这方面，结果似乎相当合适。
