研究目的
To fabricate uniform PP nano?bers with the lowest possible diameter from PP/PVB blends by a line-like CO2 laser M-ESP device and investigate the effect of the amount of PVB in PP/PVB blends on ?ber productivity, morphology, structure, and diameter.
研究成果
PP nano?bers with an average diameter of a few hundred nanometers were successfully developed from PP/PVB blends using a line-like CO2 laser-beam M-ESP system. The inclusion of PVB ensured a gentle internal dispersion with reduced viscosity, and increased the polarity of the components, facilitating the creation of a large number of Taylor cones and high production of as-spun blend ?bers with low diameter. The crystallinity of PP was improved due to the addition of PVB in blends.
研究不足
The high viscosity, low conductivity, and exit swelling of polymer melts in M-ESP constitute a considerable barrier to obtaining PP nano?bers. The immiscibility or very weak attraction between PP and PVB molecules may affect the uniformity of the blend.
1：Experimental Design and Method Selection
A nozzle-free melt-electrospinning system with a line-like CO2 laser melting device was used to manufacture PP nano?bers. The effect of PVB ratio on ?ber diameter was investigated.
2：Sample Selection and Data Sources
Isotactic PP with a melt ?ow index (MFI) of 35 g/10 min and PVB (B60HH) were used as materials. Various blend samples were made by adding 10, 20, 30, 40, 50, 60, 70, 80, and 90 wt% PVB to PP.
3：List of Experimental Equipment and Materials
Internal melt mixer, hot-press, line-like CO2 laser-beam M-ESP system, SEM, DSC, modular compact rheometer, IR spectrometer.
4：Experimental Procedures and Operational Workflow
PP/PVB blends were prepared via melt compounding. The prepared blended ?lms were fed to the line-laser melting zone at a feed rate of 1.0 mm/min. A high voltage of 40–45 kV was applied to the linearly melted zone through a copper slit. Produced ?bers were collected on the copper anode collector plate. PVB was removed from PP/PVB blended electrospun ?bers by treating with ethanol solution.
5：Data Analysis Methods
SEM observations, DSC measurements, rheological properties measurement, ATR-FTIR spectrum analysis.
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DSC
DSC-60
Shimadzu Corporation
Study of melting behavior of PP/PVB films and fibers
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Modular compact rheometer
MCR 302
Anton Paar
Measurement of rheological properties of samples
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IR spectrometer
IR Af?nity-1
Shimadzu Corporation
Recording ATR-FTIR spectrum of fibers
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Internal melt mixer
Imoto Machinery Co. Ltd
Melt compounding of PP/PVB blends
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Hot-press
Gonno Hydraulic Press Manufacturing Co.
Preparation of PP/PVB blend films
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SEM
VE-9800
Keyence Co. Ltd.
Observation of PP/PVB blend films and fibers
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