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首页> 外文期刊>Journal of Polymers and the Environment >Extrusion Para meters for Foaming of a β-Glucan Concentrate
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Extrusion Para meters for Foaming of a β-Glucan Concentrate

机译：用于发泡β-葡聚糖浓缩物的挤出仪

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摘要

Plastics is a group of materials commonly encountered on a daily basis by many people. They have enabled rapid, low-cost manufacturing of products with complicated geometries and have contributed to the weight reduction of heavy components, especially when produced into a foamed structure. Despite the many advantages of plastics, some drawbacks such as the often fossil-based raw-material and the extensive littering of the material in nature, where it is not degraded for a very long time, needs to be dealt with. One way to address at least one of the issues could be to use polymers from nature instead of fossil-based ones. Here, a -glucan concentrate originating from barley was investigated. The concentrate was processed into a foam by hot-melt extrusion, and the processing window was established. The effect of different blowing agents was also investigated. Water or a combination of water and sodium bicarbonate were used as blowing agents, the latter apparently giving a more uniform pore structure. The porous structure of the foamed materials was characterized mainly by using a combination of confocal laser scanning microscope and image analysis. The density of the samples was estimated and found to be in a similar range as some polyurethane foams. A set of 3D parameters were also quantified on two selected samples using X-ray microtomography in combination with image analysis, where it was indicated that the porous structure had a pre-determined direction, which followed the direction of the extrusion process.
机译：塑料是一组通常在许多人每天遇到的材料。它们使得具有复杂几何形状的产品的快速，低成本制造，并有助于重量减轻重量的成分，特别是当生产成泡沫结构时。尽管塑料的许多优点，但诸如经常化石的原材料和材料本质上的广泛乱扔垃圾等一些缺点，在那里它不需要处理。解决至少一个问题的一种方法可以是使用来自自然的聚合物而不是基于化石的聚合物。在此，研究了源自大麦的-Glucan浓缩物。通过热熔挤出将浓缩物加工成泡沫，并建立加工窗。还研究了不同发泡剂的作用。用水或水和碳酸氢钠的组合用作吹风剂，后者显然是给予更均匀的孔隙结构。泡沫材料的多孔结构主要是通过使用共焦激光扫描显微镜和图像分析的组合来表征。估计样品的密度并发现在与一些聚氨酯泡沫相似的范围内。在两种选定的样品中也使用X射线微微映图与图像分析组合的两种选定样品量化了一组3D参数，其中表示多孔结构具有预定方向，其在挤出过程的方向之后。

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