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Preheat Compression Molding for Polyetherketoneketone: Effect of Molecular Mobility |
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| Authors: | Zhang Xiao-Hua Jiao Meng-Xiao Wang Xin Li Bo-Lan Zhang Feng Li Yan-Bo Zhao Jing-Na Jin He-Hua Yang Yu |
| Institution: | 1.Key Laboratory of Textile Science & Technology (Ministry of Education), College of Textiles, and Innovation Center for Textile Science and Technology, Donghua University, Shanghai, 201620, China ;;2.Advanced Materials Division, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou, 215123, China ;;3.Key Laboratory of Carbon Materials, National Engineering Laboratory for Carbon Fiber Technology, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, China ; |
| Abstract: | Polyetherketoneketone (PEKK) is a new evolving polymeric material,and is considered as another important member of the polyaryletherketone (PAEK) family in addition to polyetheretherketone (PEEK).Hot compression molding can be used to compact and consolidate the PEKK products,where the temperature and pressure play key roles to affect the molecular mobility,entanglement and crystallization,and thus the mechanical properties of PEKKs.In this study,a preheating treatment was introduced in the compression molding,and it is found that such preheating is very essential to avoid the formation of crystal Form Ⅱ,based on the increased chain entanglement.Molecular dynamics simulations revealed that the molecular mobility is always suppressed when a compression is applied.Therefore,by increasing the entanglement via the preheating and maintaining such entanglement in the consequent compression molding,strong and tough PEKK materials were obtained,with a negligible fraction of crystal Form Ⅱ. |
| Keywords: | Polyetherketoneketone Molecular mobility Compression molding Mechanical properties |
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