Triazine Polymer SH Capping for High Refractive Index
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Solution Overview
Problem
Triazine ring-containing polymers with high refractive index and plasticity are needed for optical materials, but existing polymers with sulfur atoms, such as episulfide and thiourethane resins, lack plasticity and have high yellowness indices, limiting their commercialization.
Innovation Solution
A triazine ring-containing polymer with a repeating unit derived from a triazine dithiol compound, where terminal SH groups are capped with hydrocarbon groups, reducing the yellowness index and improving transparency and refractive index, is developed, incorporating a divalent aromatic hydrocarbon group to enhance glass transition temperature and refractive index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If sulfur atoms are introduced into the polymer to increase refractive index, then refractive index is improved (greater than or equal to 1.7), but plasticity deteriorates and yellowness index increases
Solution Approach 1:
The patent changes the chemical structure parameters by introducing triazine ring-containing structural units with specific configurations (General Formulas 1-4) that contain sulfur atoms. By carefully selecting the structural parameters (aromatic hydrocarbon groups, linking groups, substituent positions), the polymer achieves high refractive index (≥1.7) while maintaining plasticity through the specific molecular architecture designed in the triazine ring structure.
2Illumination intensity
If sulfur atoms are introduced into the polymer to increase refractive index, then refractive index is improved (greater than or equal to 1.7), but yellowness index deteriorates (increases)
Solution Approach 1:
The patent applies local quality by specifically designing the triazine ring structural units with particular aromatic hydrocarbon groups and substituent configurations (General Formulas 1-4). The local chemical environment around the sulfur atoms and triazine rings is optimized to achieve high refractive index while suppressing yellowing through controlled electron distribution and reduced oxidation susceptibility at critical molecular sites.
Solution Approach 2:
The patent creates a composite molecular structure combining triazine rings, aromatic hydrocarbon groups, and sulfur atoms in specific configurations. This composite structural approach (multiple structural units represented by General Formulas 1-4) synergistically achieves high refractive index while maintaining color stability, as the different structural components work together to balance optical properties and chemical stability.
3Object-affected harmful factors
If polymer structure is modified to improve transparency and reduce yellowness index, then optical properties are improved, but manufacturing complexity increases
Solution Approach 1:
The patent designs the triazine ring-containing structural units (General Formulas 1-4) to be multi-functional: they simultaneously provide high refractive index through sulfur atoms and triazine rings, maintain plasticity through the molecular structure, and ensure color stability through the specific chemical configuration. This universal structural design achieves multiple optical and mechanical properties through a single structural framework, reducing the need for separate modifications for each property.
Data Source
AI summary
Disclosed are a triazine ring-containing polymer having a repeating unit that comprises a structural unit derived from a triazinedithiol compound, the triazine ring-containing polymer having a yellowness index of less than 3 and comprising terminal SH groups, wherein at least a portion of the SH groups are capped with a hydrocarbon group, and a number of the SH groups in the triazine ring-containing polymer is less than about 1×1018 per gram of the polymer, and a thermoplastic article and optical part including the polymer.