Disulfidated Polymer Composition for Transparent High-Refractive Films
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Solution Overview
Problem
Existing high refractive index polymers (HRIPs) face challenges in achieving high transparency and facile preparation due to complex synthesis and limited sulfur content, which restricts their use in optical applications requiring large-scale production and thick films.
Innovation Solution
A method involving the polymerization of compounds of Formula (I) and (II) to form 1,2-dithiolane monomers and polymers, allowing for high sulfur content and improved refractive index through thiolyne reactions, which are more efficient and transparent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high refractive index sulfur-containing polymers are synthesized using conventional methods (poly(phenylene thioethers), poly(thioether sulfones), thioether-bridge poly(phenyl quinoxalines)), then refractive index is improved, but synthesis complexity increases and transparency decreases
Solution Approach 1:
The patent changes the chemical reaction parameters by using thiol-yne click chemistry instead of conventional polymerization methods. This allows incorporation of higher sulfur content (up to 30-50 wt%) while maintaining simple one-step synthesis and high transparency, resolving the contradiction between refractive index improvement and synthesis complexity
Solution Approach 2:
The patent creates composite polymer structures by combining thiol-containing monomers with alkyne-functionalized monomers in controlled ratios. This composite approach enables tuning of sulfur content and refractive index while maintaining processability and transparency through the flexible composition design
2Ease of manufacture
If thiolene chemistry is used to achieve low shrinkage and reduced oxygen inhibition, then processability is improved, but refractive index capability is limited due to one sulfur per ene bonding constraint
Solution Approach 1:
The patent segments the sulfur incorporation strategy by using separate thiol and alkyne functional groups that react in a stepwise manner. This segmentation allows two thiols to bond per alkyne unit, doubling the sulfur content compared to thiolene chemistry while maintaining the ease of manufacture benefits of click chemistry
Solution Approach 2:
The patent changes the stoichiometric parameters by using excess thiol groups relative to alkyne groups, enabling incorporation of up to 50 wt% sulfur content. This parameter change fundamentally increases refractive index capability from ~1.5 to ~1.7-1.8 while preserving the simplicity of the thiol-yne reaction process
3Illumination intensity
If thiolyne reactions are used to incorporate high amounts of sulfur atoms, then refractive index is improved, but chemistry exploration and optimization complexity increases
Solution Approach 1:
The patent applies the universal thiol-yne click chemistry platform across multiple monomer combinations and applications. The same reaction mechanism works for different thiol-containing monomers (vinyl sulfides, cyclic disulfides) and alkyne-functionalized monomers, simplifying chemistry optimization by using a single versatile reaction system rather than developing multiple specialized chemistries
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 method enables the production of sulfur-containing HRIPs with enhanced transparency and ease of preparation, suitable for optical applications such as lenses, waveguides, and holograms.
Implementation Method 1
A method involving the polymerization of compounds of Formula (I) and (II) to form 1,2-dithiolane monomers and polymers
Data Source
AI summary
The present disclosure describes polymer compositions obtained from cyclic 1,2-disulfides and alkyne monomers, which result in materials with optically useful properties. The disclosure also describes synthetic methods for making these polymer compositions.