Crosslinked Fluoropolymer Coatings for Low-Loss Telecom Dielectrics
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Solution Overview
Problem
The lack of perfluoropolymer materials that can be crosslinked to provide lower dielectric constants and dielectric loss properties has limited their use in electronic telecommunications articles, despite their potential for improved mechanical properties compared to uncrosslinked perfluoropolymers.
Innovation Solution
The development of crosslinked fluoropolymer compositions using fluorinated curing agents, which offer improved solubility and properties such as lower moisture uptake and thermal expansion, are used in electronic telecommunication articles like integrated circuits, printed circuit boards, and optical fiber cables, with specific formulations and application methods to achieve these properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If perfluoropolymer materials are used without crosslinking, then processing ease is improved, but mechanical properties and dielectric performance deteriorate
Solution Approach 1:
The patent applies parameter changes by introducing crosslinking degree as a controllable parameter. By adjusting the crosslinking degree through selective curing agents and processing conditions, the material transitions from aprocessable uncrosslinked state to a optimized crosslinked state, simultaneously achieving good mechanical properties and dielectric performance while maintaining processing ease through controlled crosslinking levels.
Solution Approach 2:
The patent employs composite materials by combining perfluoropolymer base materials with specific curing agents (amine-based, carboxylic acid-based, or anhydride-based). This creates a composite system where the polymer matrix provides dielectric properties while the crosslinked network enhances mechanical strength, resolving the contradiction between processing ease and mechanical properties.
2Reliability
If perfluoropolymer materials are crosslinked to improve mechanical properties, then dielectric constant and dielectric loss reduction is achieved, but solubility and processability deteriorate
Solution Approach 1:
The patent applies preliminary action by incorporating reactive functional groups (carboxylic acid groups, anhydride groups, or amine groups) into the perfluoropolymer structure before processing. These pre-installed functional groups enable subsequent crosslinking reactions that improve dielectric performance while the controlled timing of crosslinking (after coating but before final curing) maintains solubility and processability during application.
Solution Approach 2:
The patent uses parameter changes by controlling the crosslinking degree through selective curing agents and processing conditions. By adjusting crosslinking density and timing, the material maintains adequate solubility for coating application while achieving sufficient crosslinking to reduce dielectric constant and dielectric loss to below 2.0 and 0.005 respectively.
3Speed
If crosslinking is increased to reduce dielectric loss, then signal transmission speed improves, but moisture uptake and hydroscopic absorption increase
Solution Approach 1:
The patent applies parameter changes by optimizing crosslinking density to achieve the minimum necessary level for reducing dielectric loss below 0.005, rather than maximizing crosslinking. This controlled parameter adjustment reduces signal transmission speed limitations while simultaneously minimizing moisture uptake and hydroscopic absorption by avoiding excessive crosslinking that would create more hydrophilic sites.
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 crosslinked fluoropolymer compositions demonstrate reduced dielectric constants and losses, improved mechanical properties, and processing advantages, making them suitable replacements for polyimides in various electronic telecommunications applications.
Implementation Method 1
a crosslinked fluoropolymer layer comprises the reaction product of a fluoropolymer and a fluorinated curing agent
Implementation Method 2
applying the film or coating solution to a substrate
Data Source
AI summary
Electronic telecommunication article is described comprising a crosslinked fluoropolymer layer. The crosslinked fluoropolymer layer comprises the reaction product of a fluoropolymer and a fluorinated curing agent. Suitable fluorinated curing agent may comprise amine groups or at least one amine group in combination with one or more alkoxy silane groups. Also described are compositions comprising a fluoropolymer and a fluorinated curing agent and optionally fluorinated solvent; as well as methods of making coated substrates and articles.