Preparation and Characterization of Core (PEO)-Shell (PHB) Microfiber with Helical Structure
DU Jianghua, YANG Tingting, GUO Shengwei, CHEN Shihua, YU Yingchun
International Scientific & Technological Cooperation Base of Industrial Waste Recycling and Advanced Materials, School of Materials Science & Engineering, North Minzu University; Key Laboratory of Polymer Materials and Manufacturing Technology, North Minzu University, Yinchuan 750021, China
Abstract: Solutions of two biodegradable polymers, polyoxyethylene (PEO) and poly(β-hydroxybutyrate) (PHB), were individually delivered to the inner and outer channel of a coaxial-tube spinneret for electrospinning to prepare helical structured core-shell microfibers. The morphology, crystallinity and thermal properties of the fibers were characterized by TEM, ATR-FTIR, SEM, DSC and TGA, respectively. The results show that: The core-shell microfibers with smooth, non-porous and porous helix can be obtained by controlling the spinning process. Under electrospinning conditions of temperature 35 ℃, the voltage 14 kV, injection speed 0.03 mm/min, receiving distance 12 cm, drum speed 50 r/min, the core-shell microfibers with evenly distributed diameter and porous helical structures were fabricated. The starting and termination decomposition temperature of the PHB component in the core-shell microfibers of the porous helical structure were higher than that of the pure PHB fibers, and the change of the thermal decomposition rate was not obvious, while the initial decomposition temperature of the PEO component was higher than that of the pure PEO fibers, the thermal decomposition rate decreased, and the temperature change of the termination decomposition was not obvious.
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2020, Vol. 34 
