研究目的
To synthesize new series of polysiloxane copolymer through hydrosilylation reaction based on different levels of crosslink densities and phenyl content for high brightness LED encapsulant.
研究成果
The synthesized polysiloxane copolymers with phenyl rings and high crosslink densities exhibit high refractive index, hardness, adhesion strength, and transparency, making them ideal candidates for high brightness LED encapsulant. They also show low water absorption and gas permeability, and maintain stability under thermal and UV aging.
研究不足
The study focuses on the synthesis and characterization of polysiloxane copolymers for LED encapsulant, but does not explore the long-term stability under operational conditions or the cost-effectiveness of the synthesis process.
1：Experimental Design and Method Selection:
Synthesis of polysiloxane copolymer through hydrosilylation reaction with varying crosslink densities and phenyl content.
2：Sample Selection and Data Sources:
Octamethylcyclotetrasiloxane (D4), octaphenylcyclotetrasiloxane (P4), and other materials purchased from Gelest Inc. and Sigma-Aldrich.
3：List of Experimental Equipment and Materials:
Brookfield CAP 2000+ viscometer, ATAGO Refractometer, Shore A Techlock Durometer GS Series Model, Lloyd tensile instrument, UV–Vis spectrometer Lambda
4：Experimental Procedures and Operational Workflow:
Ring opening polymerization of cyclosiloxane monomer, curing of polysiloxane in a Te?on mold, characterization of viscosity, refractive index, hardness, adhesion strength, water absorption, gas permeability, and optical properties.
5：Data Analysis Methods:
Measurement of viscosity, refractive index, hardness, adhesion strength, water absorption, gas permeability, and optical properties under thermal and UV aging.
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UV–Vis spectrometer
Lambda 35
Perkin Elmer
Measurement of UV–Vis absorbance and transmission of polysiloxane series
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Agilent Cary 60 UV–Vis spectrophotometer
Cary 60
Agilent
Measurement of percentage of transmission and color change of polysiloxane series under thermal aging
Cary 60 UV-Vis Spectrophotometer
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Octamethylcyclotetrasiloxane
D4
Gelest Inc.
Polymer precursor for synthesis of polysiloxane copolymer
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Octaphenylcyclotetrasiloxane
P4
Gelest Inc.
Polymer precursor for synthesis of polysiloxane copolymer
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1,3,5,7-tetramethylcyclotetrasiloxane
D4H
Gelest Inc.
Polymer precursor for synthesis of polysiloxane copolymer
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1,3-divinyltetramethyldisiloxane
EC1
Gelest Inc.
Polymer precursor for synthesis of polysiloxane copolymer
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Hexamethyldisiloxane
EC2
Gelest Inc.
Polymer precursor for synthesis of polysiloxane copolymer
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1,1,3,3-tetramethyldisiloxane
EC3
Gelest Inc.
Polymer precursor for synthesis of polysiloxane copolymer
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Potassium hydroxide
KOH
Sigma-Aldrich (M) Sdn Bhd
Catalyst for polymerization of cyclosiloxane
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Trifluoromethanesulfonic acid
Triflic acid
Sigma-Aldrich (M) Sdn Bhd
Catalyst for polymerization of cyclosiloxane
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Platinum catalyst
Andisil 782
AB Specialty Silicones
Catalyst for hydrosilylation reaction
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Platinum(0)-1,1,3,3-tetramethyldisiloxane
C8H18OSi2Pt
AB Specialty Silicones
Catalyst for hydrosilylation reaction
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Brookfield CAP 2000+ viscometer
CAP 2000+
Brookfield
Measurement of viscosity of polysiloxane series
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ATAGO Refractometer
D-line
ATAGO
Measurement of refractive index of polysiloxane series
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Shore A Techlock Durometer GS Series Model
GS Series
Techlock
Measurement of hardness of cured polysiloxane
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Lloyd tensile instrument
Lloyd
Measurement of adhesion strength of polysiloxane series
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