Nowadays, environmental awareness is more and more important. Therefore, the importance of weight reduction and creating a circular economy has increased. In this study, we foamed bio-based polylactic acid (PLA) with thermally expandable microspheres to create homogenous, compostable polymer foams. The polylactic acid-based foamed sheet samples were produced with a flat sheet extruder at 190 °C. We investigated the temperature-dependent mechanical properties of the samples—they show maximum damping capacity in the glass transition region. We also examined the frequency-dependent properties of the foamed samples and successfully extended these properties with the time-temperature superposition principle, to broaden the potential field of application of the foams. The damping properties of homogeneous, closed-cell foam structures produced with thermally expandable microspheres increased in the range of 0.1–20 000 Hz as a function of foaming agent content. We also produced foamed sheets from PLA/PBAT (polybutylene succinate) blends. The storage modulus of unfoamed reference samples showed a decreasing tendency. The tanδ of foamed systems containing only PLA or PBAT increased. The tanδ of foamed blends decreased in 25%/75% and 50%/50%PBAT/PLA systems, except for the 75%/25%PBAT/PLA blend. Therefore, PBAT/PLA blends can only be used to improve the damping ability of foamed samples above 75 wt% PBAT.

如今，环保意识越来越重要。因此，减轻重量和创造循环经济的重要性增加了。在这项研究中，我们将生物基聚乳酸 (PLA) 与热膨胀微球发泡在一起，以制造均匀、可堆肥的聚合物泡沫。聚乳酸基发泡片材样品是用平板挤出机在 190 °C 下生产的。我们研究了样品的温度相关机械性能——它们在玻璃化转变区域显示出最大的阻尼能力。我们还检查了泡沫样品的频率相关特性，并成功地利用时间-温度叠加原理扩展了这些特性，以拓宽泡沫的潜在应用领域。均质的阻尼特性，作为发泡剂含量的函数，使用可热膨胀微球体生产的闭孔泡沫结构在 0.1-20 000 Hz 范围内增加。我们还生产了由 PLA/PBAT（聚丁二酸丁二醇酯）混合物制成的泡沫板。未发泡参考样品的储能模量呈下降趋势。仅含有 PLA 或 PBAT 的发泡系统的 tanδ 增加。除 75%/25%PBAT/PLA 共混物外，发泡共混物的 tanδ 在 25%/75% 和 50%/50%PBAT/PLA 体系中均下降。因此，PBAT/PLA 共混物只能用于提高高于 75 wt% PBAT 的泡沫样品的阻尼能力。未发泡参考样品的储能模量呈下降趋势。仅含有 PLA 或 PBAT 的发泡系统的 tanδ 增加。除 75%/25%PBAT/PLA 共混物外，发泡共混物的 tanδ 在 25%/75% 和 50%/50%PBAT/PLA 体系中均下降。因此，PBAT/PLA 共混物只能用于提高高于 75 wt% PBAT 的泡沫样品的阻尼能力。未发泡参考样品的储能模量呈下降趋势。仅含有 PLA 或 PBAT 的发泡系统的tanδ 增加。除 75%/25%PBAT/PLA 共混物外，发泡共混物的 tanδ 在 25%/75% 和 50%/50%PBAT/PLA 体系中均下降。因此，PBAT/PLA 共混物只能用于提高高于 75 wt% PBAT 的泡沫样品的阻尼能力。