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首页> 外文会议>Symposium on Cellular Metals and Polymers; 20041012-14; Furth(DE) >The Role of Rheology in Foaming Polymers
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The Role of Rheology in Foaming Polymers

机译：流变学在发泡聚合物中的作用

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As the foaming process of polymers is strongly influenced by the elongational properties of their melts, this paper focuses on the relationship between elongational flow and foaming. Blends of a linear polypropylene (L-PP) with different amounts of a long-chain branched polypropylene (LCB-PP) were used. It was found that additions of LCB-PP of less than 10wt.% lead to a significant strain-hardening behavior already. The strain hardening becomes more pronounced with growing LCB-PP content. In foaming tests with azodicarbonamide as a chemical blowing agent an improved foaming behavior with regard to higher expansion ratio, smaller cell sizes and higher cell density was found with increasing LCB-PP content up to 50wt.%. This is attributed to a reduction of cell coalescence due to the higher resistance against rupture of cell walls caused by the increasing strain hardening. For the blends with 50wt.% LCB-PP and more a foaming behavior similar to that of the neat LCB-PP was found. These results indicate that from elongational flow experiments predictions with regard to the foam properties can be made.
机译：由于聚合物的发泡过程受其熔体的伸长特性强烈影响，因此本文着重研究伸长率与发泡之间的关系。使用了线性聚丙烯（L-PP）与不同数量的长支链聚丙烯（LCB-PP）的共混物。已经发现，添加的LCB-PP小于10wt。％已经导致显着的应变硬化行为。随着LCB-PP含量的增加，应变硬化变得更加明显。在使用偶氮二甲酰胺作为化学发泡剂的发泡试验中，发现随着较高的膨胀比，较小的泡孔尺寸和较高的泡孔密度，随着LCB-PP含量增加至50wt。％，发泡性能得到了改善。这归因于由于增加的应变硬化而引起的更高的抗细胞壁破裂性，从而降低了细胞聚结。对于具有50wt。％LCB-PP和更多的共混物，发现其起泡行为类似于纯LCB-PP。这些结果表明，根据伸长流动实验可以对泡沫性能做出预测。

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