Polyhedral Polysiloxane Composition for Blue-Violet Laser Optodevices
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Solution Overview
Problem
Polysiloxane compositions face challenges in maintaining transparency over a wide temperature and wavelength region while ensuring heat resistance, light resistance, low dielectric characteristics, and workability, particularly when used in optodevices that require durability against blue-violet lasers.
Innovation Solution
A polysiloxane composition comprising a polysiloxane with a polyhedral skeleton, hydrosilyl groups, and a hydrosilylation catalyst, which includes alkenyl groups bonded to the Si atoms in the polyhedral skeleton, providing excellent heat resistance, low dielectric characteristics, and workability without compromising transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a phenyl group is introduced on a Si atom of polysiloxane to control refractive index, then transparency of composite material is improved, but heat resistance and light resistance decrease
Solution Approach 1:
The patent changes the chemical structure parameters by replacing phenyl groups with alkenyl groups (such as vinyl groups) directly bonded to Si atoms in the polysiloxane backbone. This structural parameter change maintains transparency control through refractive index adjustment while eliminating the degradation of heat and light resistance associated with phenyl groups.
Solution Approach 2:
The patent creates a composite material system combining polysiloxane with alkenyl-functionalized polyhedral skeleton units (6-24 Si atoms) and silica filler. This composite structure achieves transparency through refractive index matching while the polysiloxane matrix provides inherent heat and light resistance properties that are preserved unlike in phenyl-containing systems.
2Stability of the object's composition
If polysiloxane with polyhedral skeleton is used to suppress coefficient of thermal expansion, then thermal dimensional stability is improved, but transparency and workability deteriorate
Solution Approach 1:
The patent applies local quality by introducing alkenyl functional groups at specific locations on the polyhedral skeleton (bonded to Si atoms) rather than uniformly modifying the entire structure. This localized functionalization provides the necessary transparency and workability while the core polyhedral skeleton maintains thermal dimensional stability.
Solution Approach 2:
The patent optimizes the size parameter of the polyhedral skeleton to contain 6-24 Si atoms, which is a specific range that balances thermal stability with transparency. Additionally, the alkenyl groups enable crosslinking reactions that modify the network structure parameters to achieve both thermal stability and optical clarity.
3Ease of operation
If many hydrocarbon units (spacer composed of alkylene chain) are placed between epoxy group and polysiloxane skeleton, then workability is improved, but heat resistance and light resistance are not sufficient
Solution Approach 1:
The patent extracts and removes the hydrocarbon spacer units (alkylene chains) that were previously necessary to connect epoxy groups to the polysiloxane skeleton. By eliminating these spacers, the patent directly bonds functional groups to the polysiloxane backbone, thereby removing the source of poor heat and light resistance while maintaining workability through the alkenyl crosslinking mechanism.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The composition maintains high transparency and exhibits excellent heat resistance, light resistance, and low dielectric characteristics, making it suitable for optodevices that use blue-violet lasers, with a gel fraction of 95% or more after immersion in toluene, and a coefficient of thermal expansion of 300 ppm/K or less.
Implementation Method 1
A polysiloxane composition comprising a polysiloxane with a polyhedral skeleton, hydrosilyl groups, and a hydrosilylation catalyst, which includes alkenyl groups bonded to the Si atoms in the polyhedral skeleton
Data Source
AI summary
The present invention provides a polysiloxane composition maintaining high transparency over a wide wavelength region and a wide temperature region and being excellent in heat resistance, low-dielectric characteristics, workability, and the like. A polysiloxane composition includes (A) a polysiloxane which is composed of a polysiloxane compound having a polyhedral skeleton having 6 to 24 Si atoms in its molecule and which has at least one alkenyl group bonded directly or indirectly to a Si atom constituting the polyhedral skeleton, (B) a polysiloxane having a hydrosilyl group, and (C) a hydrosilylation catalyst.