期刊
E-POLYMERS
卷 19, 期 1, 页码 297-304出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/epoly-2019-0030
关键词
polylactide; biofoams; chemical modification; melt strength; foam extrusion; compression behavior
资金
- German Research Foundation DFG [AL 474/33-1, BO 1600/40-1]
- Bavarian Polymer Institute (BPI)
It is well known that polylactide (PLA) is difficult to foam due to its low melt strength. Thus, many ways were described in the literature to enhance the foamability. However, the melt strength was actually determined only in a limited number of publications. In this study, the addition of chemical modifiers was used to change the rheological behavior of PIA and thereby improve its foamability in foam extrusion process. For the first time the use of dicumyl peroxide modified PLA in foam extrusion is described. Both modifications lead to a distinct increase in melt strength. Here, the highest increase was shown for the PLA modified with dicumyl peroxide. Furthermore, strain hardening was observed for PLA modified with the peroxide. Low density foams were achieved for neat and modified PLA in foam extrusion. Neat PLA showed a density of 45 kg/m(3), while the peroxide modified PLA showed the highest expansion with a density reduction down to 32 kg/m(3). Both modifications result in a more uniform cell structure and an improved compression strength. Here, the foamed, peroxide modified PLA showed outstanding performance compared to neat PLA foam with twice the compression strength (151 Pa) even at a 30% lower density.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据