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- Title
Effect of nano-Calcium Carbonate on microcellular foaming of polypropylene.
- Authors
Ding, Jie; Ma, Weihua; Song, Fujiao; Zhong, Qin
- Abstract
Using supercritical carbon dioxide as the physical foaming agent, a new batch process was carried out to prepare microcellular polypropylene (PP) and polypropylene/nano-Calcium Carbonate (PP/nano-CaCO) foams. Four concentrations of nano-CaCO, 3, 5, 7, and 10 wt% were used. The cell structure of foams and advantages of this new process were investigated and explained by thermal properties. Results showed that the foamed PP/5 wt% nano-CaCO produced a microcellular foam with the minimum mean cell diameter (9.55 μm) and maximum cell density (1.50 × 10 cells/cm) among the four blends. Some unfoamed regions were observed in nanocomposite foams because nano-CaCO could accelerate crystallization in cooling and cryostat stage. The new process took much less time (2.5 h) to foam and had much broader foaming temperature range (about 55 °C). But the foaming temperature range decreased after blending nano-CaCO into PP matrix because nano-CaCO-induced isothermal and non-isothermal crystallization at higher temperature. In addition, the cell growth effect on variations of volume expansion ratio in PP/nano-CaCO nanocomposites could be neglected comparing with the heterogeneous cell nucleation effect.
- Subjects
CALCIUM carbonate; POLYPROPYLENE; CRYSTALLIZATION; BATCH processing; THERMAL properties; CARBON dioxide
- Publication
Journal of Materials Science, 2013, Vol 48, Issue 6, p2504
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-012-7039-1