研究目的
To develop highly thermally stable, transparent, and flexible nanocomposite substrates for optoelectronic applications by reinforcing a soft polymer with cellulose nanorods using a Pickering emulsification process.
研究成果
The study successfully fabricated transparent nanocomposites with high thermal stability (endurance up to 150-180°C), improved mechanical properties, and easy patternability. The hierarchical structure from Pickering emulsification enables applications in optoelectronics, photonics, and other fields like microscopy and energy storage, with the demonstrated thermal stability of microlens arrays highlighting their potential.
研究不足
The nanocomposites may initiate thermal decomposition of cellulose at around 180°C, leading to slight decreases in transparency over time. The process requires careful control of CN content to prevent resin leakage during hot compression, and the thermal expansion is anisotropic with higher values in the thickness direction.
1:Experimental Design and Method Selection:
The study used a Pickering emulsification method to create resin-in-water emulsions stabilized by cellulose nanorods (CNs), followed by dehydration, hot compression, and UV curing to produce transparent nanocomposites. This method was chosen for its simplicity and ability to uniformly mix hydrophilic CNs with hydrophobic resin without chemical intervention.
2:Sample Selection and Data Sources:
Sugar-cane bagasse pulp was used as the raw material for CN preparation. Different types of CNs (CN4K, CN1K, CN400, CN300) were produced by mechanical disintegration and acid hydrolysis with varying lengths and crystallinities. The acrylic resin ABPE-10 was selected for its low glass-transition temperature, flexibility, and refractive index close to cellulose.
3:List of Experimental Equipment and Materials:
Equipment included a grinder (MKCA6-2, Masuko Sangyo), FE-SEM (JSM-7800F Prime, JEOL), XRD (UltraX 18HF, Rigaku), UV-Vis spectrophotometer (U-4100, Hitachi), tensile testing machine (Instron 3365), dynamic thermomechanical analyzer (DMS 6100, Seiko Instruments), thermomechanical analyzer (TMA/SS 6100, Seiko Instruments), TGA (Q50, TA Instruments), and UV lamp/conveyer system (F300S, Fusion UV Systems). Materials included sugar-cane bagasse, ABPE-10 monomer, photoinitiator, NaClO2, KOH, acetic acid, HCl, and PTFE filter membranes.
4:Experimental Procedures and Operational Workflow:
CNs were prepared by chemical purification and mechanical/acid treatments. Emulsions were formed by blending CN/water slurry with resin, vacuum filtered to form mats, dried, hot compressed at 150°C and 2 MPa, and UV polymerized. For patterned surfaces, mats were compressed between patterned templates. Characterization involved FE-SEM, XRD, optical transmittance measurements, tensile tests, thermomechanical analysis, thermodimensional analysis, TGA, and birefringence observation.
5:Data Analysis Methods:
Data were analyzed using ImageJ for dimensions, Segal equation for crystallinity from XRD, and standard statistical methods for mechanical and thermal properties.
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scanning electron microscope
JSM-7800F Prime
JEOL
Imaging of cellulose nanorods and nanocomposite fracture surfaces
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X-ray diffractometer
UltraX 18HF
Rigaku
XRD analysis to determine crystallinity of cellulose samples
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ultraviolet-visible spectrophotometer
U-4100
Hitachi
Measurement of optical transmittance of nanocomposites
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thermal imaging camera
FLIR E6
FLIR Systems
Monitoring real-time temperature during thermal stability tests of microlens arrays
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grinder
MKCA6-2
Masuko Sangyo
Mechanical disintegration of cellulose fibers into nanofibers
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universal testing machine
Instron 3365
Instron
Tensile testing of nanocomposite specimens
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dynamic thermomechanical analyzer
DMS 6100
Seiko Instruments
Analysis of thermomechanical properties (storage modulus) of nanocomposites
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thermomechanical analyzer
TMA/SS 6100
Seiko Instruments
Analysis of thermodimensional properties (CTE) of nanocomposites
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thermogravimetric analyzer
Q50
TA Instruments
TGA analysis to assess thermal decomposition of nanocomposites
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UV lamp conveyer system
F300S
Fusion UV Systems
UV polymerization of nanocomposites
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PTFE filter membrane
Advantec
Vacuum filtration to form CN/resin mats
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