Amorphous Polylactide Bead Foam-Effect of Talc and Chain Extension on Foaming Behavior and Compression Properties
Amorphous Polylactide Bead Foam-Effect of Talc and Chain Extension on Foaming Behavior and Compression Properties
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DOI：
10.32604/jrm.2021.016244
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发表时间：
2021-01-01
影响因子：
--
通讯作者：
Ruckdaeschel, Holger
中科院分区：
文献类型：
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作者：
Bruetting, Christian;Dreier, Julia;Ruckdaeschel, Holger
聚乳酸（PLA）泡沫珠在包装或消费品方面的适用性显示出很高的潜力。考虑到聚乳酸与聚苯乙烯（PS）的相似性能和良好的二氧化碳足迹，它代表了石油基聚合物泡沫的潜在替代品。然而，PLA的发泡是具有挑战性的，由于其低熔融强度，因此经常使用化学改性剂。关于聚乳酸的发泡技术，目前文献资料有限。在本研究中，研究了整齐和改性的非晶态聚乳酸的发泡行为。用滑石和环氧基扩链剂对该材料进行了改性。研究了这些化合物在CO2气氛中的吸附行为和发泡行为。采用CO2饱和后快速升温的间歇式发泡法进行发泡。为实现焊接头泡沫，建立了发泡-焊接一步工艺。最后，对聚乳酸泡沫珠的压缩性能进行了研究。单泡沫和模塑泡沫的密度分别低于50 kg/m3和80 kg/m3。
Polylactide (PLA) bead foams show a high potential regarding their applicability in packaging or consumer products. Concerning the comparable properties of PLA to Polystyrene (PS) and the good CO2 footprint it represents a potential alternative to petroleum-based polymer foams. However, foaming of PLA is challenging, due to its low melt strength, therefore chemical modifiers are often used. Concerning the bead foam technology regarding PLA, the available literature is limited so far. Within this study, the bead foaming behavior of neat and modified amorphous PLA was investigated. The material was modified by talc and an epoxy-based chain extender. These compounds have been investigated regarding their sorption behavior in CO2 atmosphere and their foaming behavior. Foaming was conducted by using the batch foaming method based on a rapid temperature increase after saturation with CO2. In order to achieve welded bead foams, a one-step processing for foaming and welding has been established. Finally, the compression properties of the PLA bead foams have been investigated. Densities below 50 kg/m3 for single bead foams and 80 kg/m3 for molded foams were achieved, respectively.