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Influence of fibrillated poly(tetrafluoroethylene) on microcellular foaming of polyamide 6 in the presence of supercritical CO2 |
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| Authors: | Shuo Han Can Jiang Jianguo Mi Yaqiao Wang Shihong Chen Xiangdong Wang |
| Affiliation: | 1. School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, China
Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics, Beijing, China;2. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, China;3. College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, China;4. School of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, China |
| Abstract: | In this article, PA6/poly(tetrafluoroethylene) (PTFE) composites were prepared by internal mixer with high rotor speed. The existence of PTFE nano-fibrillation network structure was observed by scanning electron microscopy (SEM) analysis. The effect of PTFE on crystallization and rheological behavior of PA6 was evaluated. The result showed that the PTFE fibrils improved the crystallization properties of PA6 and do not change the crystal structure. The PTFE effectively enhanced the melt strength of PA6 by fibrillation. The PA6/PTFE composites were then foamed assisted by supercritical CO2. The PTFE was used as cell nucleating agent, crystal nucleating agent and melt strength enhancement agent in the foaming process. Finally, the microcellular PA6 foams were successfully obtained with the cell density higher than 109 cells/cm3, the cell size of ca. 14 μm and the volume expansion ratio of 16. |
| Keywords: | crystallization differential scanning calorimetry microcellular foams polyamide 6 PTFE |