PFPE Block Copolymers With Pendant Groups for Low-Tg Viscosity Control
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Solution Overview
Problem
Existing (Per)fluoropolyether polymers (PFPE) lack functional groups along the backbone, which are desirable for enhanced properties such as increased viscosity and low glass transition temperature while maintaining a liquid state at room temperature, and are not efficiently synthesized with segregated blocks of functional groups.
Innovation Solution
Development of block copolymers with perfluoropolyether chains containing pendant functional groups, achieved through a process involving peroxidic PFPE polymers reacted with perfluorinated compounds under UV radiation or heating, allowing control over the distribution and number of functional groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If functional groups are added to PFPE polymers to increase viscosity, then the viscosity increases, but the glass transition temperature increases which may cause the polymer to solidify at room temperature
Solution Approach 1:
The patent applies local quality by introducing functional groups at specific pendant positions along the polymer backbone rather than uniformly throughout. The functional groups are attached as pendant groups (—CH2—CH(—CH2—X)—) at controlled intervals, allowing localized modification of polymer properties. This selective placement enables viscosity enhancement through functional group interactions while maintaining the bulk polymer's low glass transition temperature by preserving the flexible perfluoropolyether backbone structure between functional groups.
2Ease of manufacture
If functional groups are randomly distributed along the polymer chain, then the synthesis is simpler, but the functional groups are not efficiently distributed and properties are not optimized
Solution Approach 1:
The patent applies segmentation by dividing the polymer chain into repeating units, each containing a perfluoropolyether backbone segment with a pendant functional group. The polymer structure is organized as —[—CF2—CF2—O—]n—[—CH2—CH(—CH2—X)—]— where n controls the spacing between functional groups. This segmented architecture provides controlled distribution of functional groups along the chain, optimizing their spacing for desired properties while maintaining systematic synthesis through defined repeating units rather than random attachment.
3Productivity
If peroxidic groups are present in the PFPE polymer, then the polymerization can proceed, but safety concerns arise and chain scission may occur
Solution Approach 1:
The patent applies the extraction principle by removing the harmful peroxidic groups from the final polymer structure. The peroxidic groups are used only as temporary intermediates during the polymerization process to initiate chain formation and attach functional groups. After the polymerization is complete, the peroxidic linkages are eliminated through reduction or decomposition, leaving a stable polymer structure without residual peroxide groups. This extracts the harmful element while preserving its useful function as a polymerization initiator.
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 resulting copolymers exhibit tunable viscosity and maintain a low glass transition temperature, suitable for use as additives in lubricants and other applications, with improved compatibility and performance characteristics.
Implementation Method 1
a process involving peroxidic PFPE polymers reacted with perfluorinated compounds under UV radiation or heating
Implementation Method 2
a process involving peroxidic PFPE polymers reacted with perfluorinated compounds under UV radiation or heating
Data Source
AI summary
The present invention relates to new copolymers comprising (per)fluoropolyether chains and functional groups as pendant groups along the backbone of the copolymers.