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Annular expansion for enhanced orientation and mechanical properties of extruded amorphous PPESK/PES pipes |
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| Authors: | Xiaotong Pan Yuxi Pan Haiyang Zhao Cheng Liu Wenguang Zeng Yujie Guo Ce Song Xigao Jian |
| Affiliation: | 1. Department of Polymer Science and Materials, School of Chemical Engineering, Dalian University of Technology, Dalian, China;2. Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-vuggy Reservoirs, CNPC, Urumqi, China Contribution: Resources (lead), Writing - review & editing (equal);3. Department of Polymer Science and Materials, School of Chemical Engineering, Dalian University of Technology, Dalian, China State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, Dalian, China Engineering Research Center of Advanced Polymer and Composite Materials, Ministry of Education, Dalian, China Dalian High Performance Resin, Processing and Application Engineering Research Center, Dalian, China Contribution: Resources (lead), Writing - review & editing (equal);4. Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-vuggy Reservoirs, CNPC, Urumqi, China Contribution: Formal analysis (equal), Investigation (equal);5. Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-vuggy Reservoirs, CNPC, Urumqi, China Sinopec Group Northwest Petroleum Branch, Urumqi, China Contribution: Resources (equal);6. State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemical Engineering, Dalian University of Technology, Dalian, China |
| Abstract: | With the discovery of deeper oil fields, conventional metal pumping pipes have been proven to be ineffective in meeting the requirements for deep well oil production due to their high weights and limited corrosion resistance. Therefore, in this study, a composite of Poly(phthalazinone ether sulfone ketone) (PPESK) and polyethersulfone (PES) was used to fabricate nonmetal pipes. To enhance the mechanical properties of the PPESK/PES pipes, a self-designed annular expansion pipe extruder head was used. The circumferential burst stress and axial tensile strength of the PPESK/PES pipes subjected to 30° expansion were 73.0% and 48.9% higher than those of the unexpanded sample, respectively. When annular expansion was integrated into the extrusion of PPESK/PES/carbon fiber pipes, the axial tensile strength and circumferential burst stress were 45.9% and 88.8% higher than those of the unexpanded sample, respectively. Results of polarized infrared testing and metallographic microscopic examinations demonstrated that molecular chains present a regular orientation at a certain angle to the extrusion direction, under the effect of annular expansion extrusion. These findings highlight the efficiency of annular expansion in promoting the large-scale production of pipes. |
| Keywords: | blends copolymers crystallization cross-linking polyamides |