Peroxidic Fluoropolyether Surfactant for Controlled Polymerization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The use of PFOA or its salts as surfactants in fluorin-containing dispersion polymerization leads to environmental contamination due to their stability and difficulty in degradation, raising health concerns and the need for alternative surfactants that can control polymerization effectively.
Innovation Solution
Peroxidic fluoropolyether carboxylic acid or its salts are used as surfactants in emulsion polymerization of fluorin-containing monomers, featuring a peroxy bond and ether bonds that provide high temperature resistance and chemical stability, allowing for controlled polymerization with reduced initiator amounts and reaction time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PFOA or its salts are used as surfactants in fluorin-containing dispersion polymerization, then effective polymerization control is achieved, but environmental contamination occurs due to stability and difficulty in degradation
Solution Approach 1:
The invention changes the chemical structure parameters of the surfactant by introducing peroxide bonds (-O-O-) into the fluoropolyether chain, creating a labile bond that allows controlled degradation. This maintains the surfactant's effectiveness during polymerization while enabling environmental breakdown after use, thus resolving the contradiction between reliability and environmental harm.
Solution Approach 2:
The peroxidic fluoropolyether is designed as a temporary, consumable surfactant that performs its function during polymerization then degrades. The peroxide bonds break down under reaction conditions, allowing the surfactant to be effective during use but short-lived in the environment, eliminating long-term contamination while maintaining polymerization control.
2Productivity
If peroxidic fluoropolyether is used as surfactant, then reaction control is improved and initiator amount is reduced, but the peroxide bond instability may affect surfactant durability
Solution Approach 1:
The surfactant's stability is made dynamic rather than static. The peroxide bonds remain stable under storage and mild conditions but become labile under polymerization conditions (heat, catalysts), allowing the surfactant to be durable when needed and reactive when required. This dynamic behavior resolves the contradiction between productivity improvement and durability maintenance.
Solution Approach 2:
The surfactant undergoes a functional phase transition from stable to unstable state during polymerization. The peroxide bonds are stable at lower temperatures and pH but decompose under the specific conditions of polymerization (elevated temperature, presence of catalysts), providing controlled reaction initiation while maintaining surfactant integrity during storage and application.
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 use of peroxidic fluoropolyether surfactants results in a fluorin-containing polymer dispersion with improved reaction control, reduced environmental impact by minimizing PFOA residues, and the ability to produce stable, high-quality fluoropolymers with shorter reaction times and lower initiator requirements.
Implementation Method 1
Due to the small bond energy and the long bond length of peroxide bond, it is unstable and decomposes easily in the reaction
Implementation Method 2
coordinating it with additives, such as initiator, in the production of aqueous dispersion of fluorin-containing monomer can induce the reaction moderate
Data Source
AI summary
The present invention provides peroxidic fluoropolyether and a fluorin-containing dispersion obtained from polymerization of fluorin-containing monomers in the presence of peroxidic fluoropolyether as a surfactant. The peroxidic fluoropolyether can be used as surfactant for producing aqueous dispersion of fluorin-containing monomer in place of PFOA or the salts thereof. Thus the amount of PFOA or the salts thereof is reduced and the natural environment is protected. In addition, applying peroxidic fluoropolyether as surfactant and combining it with adjuvants, such as initiator, can induce the reaction moderate and can be beneficial to the polymerization control, thus reducing the amount of initiator or shortening the reaction time.