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首页> 外文期刊>Journal of Applied Polymer Science >Low-cycle fatigue behavior of flexible3Dprinted thermoplastic polyurethane blends for thermal energy storage/release applications
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Low-cycle fatigue behavior of flexible3Dprinted thermoplastic polyurethane blends for thermal energy storage/release applications

机译：用于热能储存/释放应用的柔性3dprinted热塑性聚氨酯共混物的低循环疲劳行为

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摘要

Thermal energy storage (TES) materials constituted by a microencapsulated paraffin having a melting temperature of 6 degrees C and a thermoplastic polyurethane (TPU) matrix were prepared through fused deposition modeling. Scanning electron microscope (SEM) micrographs demonstrated that the microcapsules were homogeneously distributed within the matrix, with a rather good adhesion within the layers of 3D printed specimens, even at elevated concentrations of microcapsules. The presence of paraffin capsules having a rigid polymer shell lead to a stiffness increase, associated to a decrease in the stress and in the strain at break. Tensile and compressive low-cycles fatigue tests showed that the presence of microcapsules negatively affected the fatigue resistance of the samples, and that the main part of the damage occurred in the first fatigue cycles. After the first 10 loading cycles at 50% of the stress at break, a decrease in the elastic modulus ranging from 60% for neat TPU to 80% for composite materials was detected. This decrease reached 40% of the original value at 90% of the stress at break after 10 cycles. Differential scanning calorimetry tests on specimens after fatigue loading highlighted a substantial retention of the original TES capability, in the range of 80%-90% of the pristine value, even after 1000 cycles, indicating that the integrity of the capsules was maintained and that the propagation of damage during fatigue tests took probably place within the surrounding polymer matrix. It could be therefore concluded that it is possible to apply the developed blends in applications where the materials are subjected to cyclic stresses, both in tensile and compressive mode.
机译：通过熔融沉积模型制备了由熔融温度为6℃的微胶囊石蜡和热塑性聚氨酯（TPU）基体组成的储能材料。扫描电子显微镜（SEM）显微照片表明，微囊均匀地分布在基质中，即使在微囊浓度升高的情况下，在3D打印样品层内也具有相当好的粘附性。具有刚性聚合物外壳的石蜡胶囊的存在导致硬度增加，与断裂时的应力和应变降低相关。拉伸和压缩低周疲劳试验表明，微胶囊的存在对样品的抗疲劳性产生了负面影响，损伤的主要部分发生在第一次疲劳循环中。在断裂应力为50%的前10个加载循环后，检测到弹性模量从纯TPU的60%下降到复合材料的80%。在10个循环后，在90%的断裂应力下，该下降达到原始值的40%。疲劳加载后对试样进行的差示扫描量热法测试突出显示，即使在1000次循环后，原始TES性能仍保持在原始值的80%-90%范围内，这表明胶囊的完整性得以保持，疲劳试验期间的损伤扩展可能发生在周围的聚合物基质中。因此可以得出结论，在材料受到拉伸和压缩模式的循环应力的应用中，可以使用开发的共混物。

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