SHINSHU UNIVERSITY Study on the poly1 butene fibrous
SHINSHU UNIVERSITY Study on the poly(1 -butene) fibrous membrane via electrospinning Daisuke Kimura 키무라 다이수케 Shinshu University Nano Fusion Technology Research Group
Outline Introduction - Electrospinning - Poly(1 -butene) - Goal of my study Experimental - preparation of samples - characterizations Results and discussions - SEM, WAXD, and DSC Conclusions Shinshu University Nano Fusion Technology Research Group
Introduction Electrospinning Device for the solution electrospinning Shinshu University Nano Fusion Technology Research Group
Polyolefines Polyethylene Polypropylene Poly(1 -butene) Poly(4 -metyl-1 -pentene) Polyolefines Insulation Mechanical strength Chemical stability Good point Shinshu University Nano Fusion Technology Research Group
Poly(1 -butene) Structural formula of Poly(1 -butene) Semi crystalline polymer PB has four different crystalline structure (I, I´, II, and III) PB crystalline structure has time-dipendent Shinshu University Nano Fusion Technology Research Group
Goal of my study It was difficult to prepare PB fibrous membrane via solution electrospinning process. Preparing PB fibrous membrane and finding best condition of electrospinning Studies about crystalline properties of electrospun PB membrane were not so many. Researching about crystalline transformation by mechanical deformation. Shinshu University Nano Fusion Technology Research Group
Experimental Preparation - electrospinning Applied voltage : 10 k. V Tip Collector Distance : 15 cm Collector : Rotating drum Ambient temperature : RT Ambient humidity : about 40% Solution concentration : 0. 5 %, 1. 5 %, and 2. 0 % (Each solution were stirred at 80℃ and then cooled to room temperature. ) Shinshu University Nano Fusion Technology Research Group
Preparation - Stretching Equipment : tensile tester Stretched length : 8 %, 16%, and 24 % Stretched 8% Initial length (100 %) 16% 24% Shinshu University Nano Fusion Technology Research Group
Characterizations SEM (Scanning electron microscopy) Which concentration is the best? Tensile test Elastic and plastic deformation range. WAXD (Wide angle X-ray diffraction) Evaluation about crystalline structure. DSC (Differential scanning calorimetry) Additional evaluation about crystalline structure. Shinshu University Nano Fusion Technology Research Group
Results and discussions SEM images of PB membranes 2. 50 wt% 1. 50 wt% 0. 50 wt% 10. 0μm SEM images of PB membranes Shinshu University Nano Fusion Technology Research Group
Tensile test 5. 0 Force (N) 4. 0 Elastic zone 3. 0 2. 0 1. 0 0 5 10 15 20 25 30 35 Deformation (mm) Force – Deformation curve of PB membranes (Initial sample size was 5 cm) Shinshu University Nano Fusion Technology Research Group
SEM images of stretched PB membranes 24% relaxed 24% 16% 20. 0μm 8% 0% 20. 0μm SEM images of stretched PB membranes Shinshu University Nano Fusion Technology Research Group
Effect of stretching to fiber diameter 1. 8 Average diameters (μm) 1. 6 1. 4 1. 2 1. 0 0. 8 0. 6 0. 4 0. 2 0. 0 Not stretched 8% 16% 24% relaxed Average diameters of each sample Shinshu University Nano Fusion Technology Research Group
Crystalline transformation - WAXD 24% relaxed 24% Stretched 16% Stretched 8% Stretched E-Spun PB Membrane 5 10 15 2 theta 20 25 30 Structural formula of Poly(1 -butene) Shinshu University Nano Fusion Technology Research Group
Crystalline transformation - DSC 24% relaxed Melting point of form I´ Not stretched 60 80 100 120 Temperature(℃) 140 160 Structural formula of Poly(1 -butene) Shinshu University Nano Fusion Technology Research Group
Conclusions We successfully prepared poly(1 -butene) fibrous membrane via electrospinning. We observed and evaluated about stretched effect by SEM, WAXD, and DSC for the first time. It was observed that mechanical deformation caused crystalline transformation such as form II → form I by WAXD and DSC. Shinshu University Nano Fusion Technology Research Group
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