研究目的
To demonstrate a dichroic nanocomposite film with outstanding optical properties by introducing cellulose nanowhiskers (CNWs) into PVA iodine complex.
研究成果
The addition of CNWs leads to an enhancement in thermal stability and mechanical properties. The transmittance and degree of polarization improved as the draw ratio and the content of CNWs increased. This is attributed to the microstructural change of PVA crystals such as enhanced orientation and crystallinity of PVA.
研究不足
The study employed significantly simplified processing conditions, reducing the iodine treatment time and the extension ratio of film compared to commercial production conditions.
1：Experimental Design and Method Selection:
CNWs were isolated via acid hydrolysis and embedded into PVA film. The film was then elongated and dyed with iodine.
2：Sample Selection and Data Sources:
Microcrystalline cellulose (MCC) powder was used as the source for CNWs.
3：List of Experimental Equipment and Materials:
Poly(vinyl alcohol) (PVA), sulfuric acid, membrane filters, iodine, potassium iodide, boric acid, Nano DS particle size analyzer, AFM, TEM, FE-SEM, DSC, WAXD, UV-visible spectrometer.
4：Experimental Procedures and Operational Workflow:
CNWs were isolated via acid hydrolysis, embedded into PVA film, the film was immersed in I2/KI solution and drawn in boric acid solution.
5：Data Analysis Methods:
Size distribution of CNWs was evaluated using a particle size analyzer. Thermal characteristics were investigated using DSC. The crystallinity of samples was calculated using the heat of fusion.
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Transmission electron microscope
JEM-200CX
JEOL
Analysis of CNWs
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Wide angle X-ray diffraction
D/MAX-2500
Rigaku
Conducting WAXD experiments
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UV-visible spectrometer
Lambda 25
Perkin-Elmer
Measurement of single transmittance of samples
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Poly(vinyl alcohol)
85,000-124,000
Sigma Aldrich
Matrix material for the nanocomposite film
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Microcrystalline cellulose
50 μm
Acros Organics
Source for cellulose nanowhiskers
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Sulfuric acid
Duckan Chemical
Used for acid hydrolysis of MCC
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Membrane filters
550 nm
Hyundai Micro
Filtration of CNW suspension
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Iodine
Iodeal Brands Co
Dye for the PVA film
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Potassium iodide
Component of the I2/KI solution
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Boric acid
Quiborax Co
Used in the drawing solution
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Nano DS particle size analyzer
Cilas 1090
Evaluation of the size distribution of CNWs
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Atomic force microscope
XE-100
Park System
Observation of CNWs
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Field emission scanning electron microscope
S-4300
Vecco
Obtaining cross-sectional images of the specimens
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Differential scanning calorimetry
Q2000 system
TA Instruments
Investigation of thermal characteristics of specimens
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