Polydisulfide Polymer Composition for High-Index Transparent Optics
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Solution Overview
Problem
Existing materials with high refractive index and optical transparency are either expensive, hazardous, or have limitations such as short shelf life, nanoparticle aggregation, or are incompatible with high-temperature processing, making them unsuitable for advanced optical devices.
Innovation Solution
Development of polydisulfide polymers with disulfide repeats in the main chain, synthesized via thiol and/or ene monomers, offering a refractive index range of 1.70 to 1.85 and high transparency, which are easily processable and cost-effective.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If existing high refractive index materials are used, then refractive index is improved, but cost increases and safety deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating sulfur-containing functional groups (disulfide repeats) into the polymer backbone, which fundamentally alters the refractive index while maintaining safety. This parameter change achieves high refractive index (1.70-1.85) through molecular structure modification rather than using hazardous heavy metal oxides or other harmful materials.
Solution Approach 2:
The patent creates a composite polymer system combining disulfide repeats with various organic groups (aromatic, aliphatic, heterocyclic) to achieve the desired optical properties. This composite approach allows tuning of refractive index through molecular design while avoiding hazardous materials by using organic sulfur compounds instead of inorganic harmful substances.
2Temperature
If existing high refractive index materials are used, then refractive index is improved, but manufacturing cost increases
Solution Approach 1:
The patent modifies the material composition by incorporating sulfur atoms into the polymer backbone, which increases refractive index through intrinsic molecular properties rather than requiring expensive heavy metal additives. This parameter change achieves cost-effective high refractive index materials by using organic sulfur compounds that are generally more affordable than rare earth metal oxides.
Solution Approach 2:
The patent introduces sulfur-containing functional groups at specific locations within the polymer structure (disulfide repeats in the main chain) to locally enhance the refractive index. This localized quality improvement allows achieving high overall refractive index without uniformly using expensive materials throughout the entire polymer structure.
3Temperature
If nanoparticle-based high refractive index materials are used, then refractive index is improved, but stability deteriorates due to aggregation
Solution Approach 1:
The patent extracts the refractive index-enhancing functionality from separate nanoparticle additives and integrates it directly into the polymer backbone through disulfide repeats. This extraction eliminates the nanoparticle aggregation problem by incorporating the high refractive index functionality at the molecular level within the polymer chain itself, ensuring uniform distribution and long-term stability.
Solution Approach 2:
The patent creates an intrinsically composite polymer structure where sulfur-containing disulfide repeats are embedded within the polymer backbone. This composite design achieves high refractive index through molecular-level integration rather than physical mixing of nanoparticles, preventing aggregation and ensuring compositional stability.
4Ease of manufacture
If conventional polymer synthesis methods are used, then ease of manufacture is improved, but refractive index deteriorates
Solution Approach 1:
The patent changes the synthesis approach by incorporating sulfur-containing monomers (thiol and/or ene monomers with sulfur groups) into conventional polymerization processes. This parameter change allows using standard polymer synthesis methods while achieving high refractive index through the sulfur-containing functional groups in the polymer backbone, maintaining ease of manufacture.
Solution Approach 2:
The patent designs sulfur-containing monomers that can participate in conventional thiol-ene or thiol-yne polymerization reactions, making the high refractive index functionality compatible with existing manufacturing processes. This universality allows the material to be produced using conventional polymer synthesis equipment and methods while achieving enhanced optical properties.
Data Source
AI summary
A method for forming a polydisulfide polymer is described. In various implementations, the method includes forming a mixture including one or more thiols, agitating the mixture, precipitating the mixture, and extracting a polydisulfide polymer from the mixture. In various implementations, the polydisulfide polymer has a refractive index of at least 1.7.