期刊
RSC ADVANCES
卷 4, 期 110, 页码 65035-65043出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra12828a
关键词
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资金
- National Nature Science Foundation of China [51303114, 51121001]
- Doctoral fund of Ministry of Education of China [20130181120056]
- Shanghai Synchrotron Radiation Facility
In this paper, the critical formation conditions for beta-form hybrid shish kebab structure were successfully established based on the temperature/composition diagram of polypropylene (PP)/beta nucleating agent (TMB-5). Furthermore, this special structure was subsequently realized in practical PP pipe processing and the multi-level and multi-scale structures were investigated comprehensively by employing various characterization approaches. The results showed that the beta-form hybrid shish-kebab structure had a cylindrical symmetry where beta-form lamellas were arranged in two different ways along the fibrous nucleating agent: the edge-on lamellae being parallel and the flat-on lamellae being perpendicular to the nucleating agent, indicating the double-orientation of the molecular chains. Moreover, based on the thicker flat-on lamellae and the higher ratio of flat-on to edge-on lamellae in the inner layer with slower cooling, a two order growth mechanism of the beta-form hybrid shish-kebab was proposed: flat-on lamellae forming first at high temperature, followed by the formation of edge-on lamellae during the cooling
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