Gupta Nevin Stephen, Lee Kwan-Soo, Labouriau Andrea
C-CDE Chemical Diagnostics and Engineering, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Polymers (Basel). 2021 Apr 2;13(7):1141. doi: 10.3390/polym13071141.
In order to meet the needs of constantly advancing technologies, fabricating materials with improved properties and predictable behavior has become vital. To that end, we have prepared polydimethylsiloxane (PDMS) polymer samples filled with carbon nanofibers (CFs) at 0, 0.5, 1.0, 2.0, and 4.0 CF loadings (/) to investigate and optimize the amount of filler needed for fabrication with improved mechanical properties. Samples were prepared using easy, cost-efficient mechanical mixing to combine the PDMS and CF filler and were then characterized by chemical (FTIR), mechanical (hardness and tension), and physical (swelling, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and coefficient of thermal expansion) analyses to determine the material properties. We found that hardness and thermal stability increased predictably, while the ultimate strength and toughness both decreased. Repeated tension caused the CF-filled PDMS samples to lose significant toughness with increasing CF loadings. The hardness and thermal degradation temperature with 4 wt.% CF loading in PDMS increased more than 40% and 25 °C, respectively, compared with the pristine PDMS sample. Additionally, dilatometer measurements showed a 20% decrease in the coefficient of thermal expansion (CTE) with a small amount of CF filler in PDMS. In this study, we were able to show the mechanical and thermal properties of PDMS can be tuned with good confidence using CFs.
为了满足不断发展的技术需求，制造具有改进性能和可预测行为的材料变得至关重要。为此，我们制备了填充有碳纳米纤维（CF）的聚二甲基硅氧烷（PDMS）聚合物样品，CF的负载量分别为0、0.5、1.0、2.0和4.0（/），以研究和优化制造具有改进机械性能所需的填料量。使用简单、经济高效的机械混合方法将PDMS和CF填料混合制备样品，然后通过化学分析（傅里叶变换红外光谱法（FTIR））、机械性能分析（硬度和拉伸）以及物理性能分析（溶胀、热重分析（TGA）、差示扫描量热法（DSC）和热膨胀系数）来确定材料性能。我们发现硬度和热稳定性可预测地增加，而极限强度和韧性均下降。反复拉伸导致填充CF的PDMS样品随着CF负载量的增加而失去显著的韧性。与原始PDMS样品相比，PDMS中CF负载量为4 wt.%时，硬度和热降解温度分别提高了40%以上和25℃。此外，膨胀计测量结果表明，PDMS中添加少量CF填料时，热膨胀系数（CTE）降低了20%。在本研究中，我们能够证明使用CF可以很好地调节PDMS的机械性能和热性能。
