Nguyen Viet Phuong, Kim Duckjong, Lee Seung-Mo
Department of Nanomechanics, Korea Institute of Machinery and Materials (KIMM), 156 Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, South Korea.
Nano Mechatronics, Korea University of Science and Technology (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, South Korea.
ACS Omega. 2021 Oct 21;6(43):29054-29059. doi: 10.1021/acsomega.1c04233. eCollection 2021 Nov 2.
The thermal properties of the polymer, together with mechanical stability, have been one of the key engineering factors to be considered for various applications. Here, we engineered the thermal conductivity of the amorphous poly(acrylic acid) (PAA) polymer by vapor-phase infiltration (VPI), which has usually occurred during the atomic layer deposition process. We observed that the VPI causes metal infiltration (e.g., Al and Zn) into the amorphous PAA polymer, which noticeably increases the thermal conductivity of the PAA polymer. From spectroscopy analysis and density functional theory simulations, we found that the carboxyl groups (-COOH) in PAA are notably modified and the bonding states of carbon and oxygen are significantly altered by the infiltrated metal. The newly formed Al-mediated bonds likely provide continuous phonon propagation pathways, thereby enhancing the thermal conductance. We believe that VPI could be a simple and useful way to engineer the thermal properties of various polymeric materials.
聚合物的热性能与机械稳定性一起，一直是各种应用中需要考虑的关键工程因素之一。在此，我们通过气相渗透（VPI）来调控非晶态聚丙烯酸（PAA）聚合物的热导率，这种情况通常发生在原子层沉积过程中。我们观察到，气相渗透会使金属（如铝和锌）渗入非晶态PAA聚合物中，这显著提高了PAA聚合物的热导率。通过光谱分析和密度泛函理论模拟，我们发现PAA中的羧基（-COOH）被显著改性，并且渗入的金属使碳和氧的键合状态发生了显著变化。新形成的铝介导键可能提供了连续的声子传播途径，从而增强了热传导。我们认为，气相渗透可能是一种简单且有用的方法来调控各种聚合物材料的热性能。
