Electrooptic Compound with Polycyclic Ring for Thermal Stability
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Solution Overview
Problem
Conventional electrooptic (EO) compounds lack sufficient heat resistance, leading to degradation under high temperature conditions, which limits processing conditions and element formation in optical and electronic applications.
Innovation Solution
A compound with a divalent polycyclic condensed ring group and a linking group is introduced into the n-conjugated bridge structure, enhancing heat resistance and hyperpolarizability, allowing for improved thermal stability and process flexibility in EO element production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional EO compounds are used to achieve high EO coefficient and fast operation speed, then the electrooptic performance is improved, but the heat resistance is insufficient and decomposition occurs under high temperature conditions
Solution Approach 1:
The patent modifies the molecular structure parameters of EO compounds by introducing polycyclic condensed ring groups (such as dibenzofuran, dibenzothiophene, carbazole) and specific linking groups into the n-conjugated bridge system. This structural parameter change enhances the thermal stability and heat resistance of the compound, allowing it to withstand high-temperature processing conditions without decomposition while maintaining its electrooptic properties.
Solution Approach 2:
The patent creates composite molecular structures by combining electron-donating groups (with polycyclic condensed rings) and electron-withdrawing groups through n-conjugated bridges. This composite approach integrates multiple functional moieties that collectively provide both high electrooptic performance and improved thermal stability, resolving the contradiction between EO coefficient and heat resistance.
2Manufacturing precision
If high temperature is applied during poling and thermal curing processes, then the orientation and curing are improved, but conventional EO compounds decompose due to insufficient heat resistance
Solution Approach 1:
The patent elevates the thermal stability parameter of EO compounds through strategic molecular design. By incorporating polycyclic condensed ring structures (dibenzofuran, dibenzothiophene, carbazole) into the electron-donating groups, the compound's decomposition temperature is increased, enabling it to withstand the high-temperature poling (typically 80-150°C) and thermal curing processes without degradation, thus achieving both high orientation quality and thermal stability.
3Reliability
If the n-conjugated bridge length is increased to enhance EO coefficient, then the electrooptic effect is improved, but the heat resistance and thermal stability are reduced
Solution Approach 1:
The patent applies local quality enhancement by introducing rigid polycyclic condensed ring groups at specific positions within the molecular structure. Rather than uniformly extending the n-conjugated bridge which would reduce thermal stability, the patent strategically places heat-resistant polycyclic structures (such as dibenzofuran, dibenzothiophene, carbazole) in the electron-donating groups, allowing the molecule to simultaneously achieve high EO coefficient through extended conjugation and high thermal stability through localized rigid heat-resistant structures.
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 compound provides excellent heat resistance and high hyperpolarizability, enabling reliable performance in high-temperature processes such as poling and thermal curing, thereby increasing the freedom in EO element production and ensuring durable EO elements.
Implementation Method 1
an EO compound is oriented in a direction of the applied electric field by a Coulomb force between dipole moment of the EO compound and the applied electric field
Implementation Method 2
an electric field is usually applied in a state where heating is performed to a temperature near a glass transition temperature of a host material to promote a molecular motion of the EO compound
Data Source
AI summary
A compound having formula (1) has excellent heat resistance.In formula (1), X represents a divalent polycyclic condensed ring group having two or more thiophene rings and having an sp3 carbon atom as a constituent element. R1 and R2 each represent an alkyl group, R3 represents an alkyl group, k represents an integer of 0 to 4, and A represents a group having formula (a1), (a2), or (b1):R4, R5, R6, R7, R8, and R9 each represent an alkyl group, E1 and E2 each represent —C(R10)(R11)—, —C(O)—, —O—, or —NR12—. R10 and R11 each represent an alkyl group, R12 represents an alkyl group, m and n each represent 0 or 1, where m+n=1.