Optical Waveguide Core Cladding Adhesion
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Solution Overview
Problem
Resin-made optical waveguides face issues with thermal resistance and are prone to separation, cracking, or interface failures when subjected to heating, bending, or temperature changes due to poor adhesion between the core and cladding.
Innovation Solution
The optical waveguide is composed of a core formed by curing a fluorine-containing polyarylene prepolymer with crosslinkable functional groups and a cladding formed by curing a curable composition containing a compound with crosslinkable functional groups, where the ratio of the fluorine-containing prepolymer to the total mass is between 1 to 97%, ensuring excellent adhesion and thermal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a resin-made optical waveguide is used, then device size is reduced and communication speed is improved, but thermal resistance deteriorates and interface separation or cracking occurs under heating or bending
Solution Approach 1:
The patent uses a composite curable composition containing both fluorine-containing polyarylene prepolymer (A) and compound (B) with crosslinkable functional groups. This composite material system provides both the low dielectric constant and high transparency of fluorinated resins while achieving excellent adhesion and thermal resistance through crosslinking reactions between the two components, resolving the contradiction between miniaturization and reliability.
Solution Approach 2:
The patent optimizes the molecular weight of compound (B) to be 140 to 5,000 and controls the ratio of prepolymer (A) to compound (B) to be 1 to 97 by mass. These parameter changes enable the curable composition to achieve both good adhesion to the core and excellent thermal resistance, preventing interface separation under heating or bending while maintaining the benefits of resin-made waveguides.
2Adaptability or versatility
If heating or bending is applied to improve flexibility or integration, then adaptability is improved, but separation or cracking occurs at the core-cladding interface
Solution Approach 1:
The patent controls the molecular weight of compound (B) within 140 to 5,000 and adjusts the composition ratio of (A) and (B) to achieve optimal balance between adhesion and flexibility. This enables the optical waveguide to withstand heating and bending without interface separation, maintaining strength while improving adaptability for various integration scenarios.
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
This configuration results in an optical waveguide with enhanced thermal resistance and improved contact between the core and cladding, preventing separation and cracking under various environmental conditions, while maintaining high transparency and compatibility with existing optical devices.
Implementation Method 1
a core formed by curing (A) a fluorine-containing polyarylene prepolymer having a crosslinkable functional group
Implementation Method 2
a cladding formed by curing (I) a curable composition containing (B) a compound having a molecular weight of 140 to 5,000, having a crosslinkable functional group
Data Source
AI summary
The present invention relates to an optical waveguide containing: a core formed by curing (A) a fluorine-containing polyarylene prepolymer having a crosslinkable functional group; and a cladding formed by curing (I) a curable composition containing (B) a compound having a molecular weight of 140 to 5,000, having a crosslinkable functional group and having no fluorine atom, and (A) a fluorine-containing polyarylene prepolymer.