Pezzana Lorenzo, Riccucci Giacomo, Spriano Silvia, Battegazzore Daniele, Sangermano Marco, Chiappone Annalisa
Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy.
Department of Applied Science and Technology, Sede di Alessandria, Politecnico di Torino, Viale Teresa Michel 5, 15121 Alessandria, Italy.
Nanomaterials (Basel). 2021 Feb 2;11(2):373. doi: 10.3390/nano11020373.
This study demonstrates the possibility of forming 3D structures with enhanced thermal conductivity (k) by vat printing a silicone-acrylate based nanocomposite. Polydimethylsiloxane (PDSM) represent a common silicone-based polymer used in several applications from electronics to microfluidics. Unfortunately, the k value of the polymer is low, so a composite is required to be formed in order to increase its thermal conductivity. Several types of fillers are available to reach this result. In this study, boron nitride (BN) nanoparticles were used to increase the thermal conductivity of a PDMS-like photocurable matrix. A digital light processing (DLP) system was employed to form complex structures. The viscosity of the formulation was firstly investigated; photorheology and attenuate total reflection Fourier-transform infrared spectroscopy (ATR-FTIR) analyses were done to check the reactivity of the system that resulted as suitable for DLP printing. Mechanical and thermal analyses were performed on printed samples through dynamic mechanical thermal analysis (DMTA) and tensile tests, revealing a positive effect of the BN nanoparticles. Morphological characterization was performed by scanning electron microscopy (SEM). Finally, thermal analysis demonstrated that the thermal conductivity of the material was improved, maintaining the possibility of producing 3D printable formulations.
本研究证明了通过对基于硅氧烷 - 丙烯酸酯的纳米复合材料进行光固化3D打印来形成具有增强热导率（k）的3D结构的可能性。聚二甲基硅氧烷（PDSM）是一种常见的有机硅基聚合物，应用于从电子到微流体的多个领域。不幸的是，该聚合物的k值较低，因此需要形成复合材料以提高其热导率。有几种类型的填料可用于实现这一结果。在本研究中，使用氮化硼（BN）纳米颗粒来提高类似PDMS的光固化基质的热导率。采用数字光处理（DLP）系统来形成复杂结构。首先研究了配方的粘度；进行了光流变学和衰减全反射傅里叶变换红外光谱（ATR - FTIR）分析，以检查该系统的反应性，结果表明该系统适用于DLP打印。通过动态机械热分析（DMTA）和拉伸试验对打印样品进行了力学和热分析，揭示了BN纳米颗粒的积极作用。通过扫描电子显微镜（SEM）进行了形态表征。最后，热分析表明材料的热导率得到了提高，同时保持了生产3D可打印配方的可能性。
