Preparation of High Performance Copolyimide Fibers via Increasing Draw Ratios
Mengying Zhang
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 China
Search for more papers by this authorHongqing Niu
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 China
Search for more papers by this authorZhiwei Lin
College of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio, 44325-3909 USA
Search for more papers by this authorShengli Qi
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 China
Search for more papers by this authorJingjing Chang
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 China
Search for more papers by this authorQiyan Ge
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 China
Search for more papers by this authorCorresponding Author
Dezhen Wu
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 China
Search for more papers by this authorMengying Zhang
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 China
Search for more papers by this authorHongqing Niu
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 China
Search for more papers by this authorZhiwei Lin
College of Polymer Science and Polymer Engineering, The University of Akron, Akron, Ohio, 44325-3909 USA
Search for more papers by this authorShengli Qi
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 China
Search for more papers by this authorJingjing Chang
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 China
Search for more papers by this authorQiyan Ge
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 China
Search for more papers by this authorCorresponding Author
Dezhen Wu
State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 China
Search for more papers by this authorAbstract
High performance fibers based on copolyimide (co-PI) containing benzimidazole and ether moieties were prepared via a two-step wet spinning method. The effects of draw ratio on the structures and properties of the fibers are investigated. The mechanical properties of the co-PI fibers are improved greatly by increasing draw ratio at temperatures above 400 °C, reaching the optimum tensile strength of 2.8 GPa and modulus of 136 GPa, which is due to the development of the molecular orientation along the fiber direction. The hot drawing process roughens the fiber surface and stretches the molecules in the fibers. Moreover, the fiber structure evolutions during the drawing process were also discussed and a “smectic A liquid crystal-like” model was proposed.
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