Thermally Stable SMMs for High-Temperature Polymer Processing
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Solution Overview
Problem
Existing fluorochemicals lack thermal stability to be processed at temperatures above 200 °C, which is required for high-temperature applications such as medical care garments and protective wear, limiting their use in materials like thermoplastic films and fibers.
Innovation Solution
Development of surface modifying macromolecules (SMMs) with high thermal degradation temperatures, specifically formulated with soft and hard segments and surface active groups, that can be admixed with base polymers to impart water and oil repellency while withstanding high processing temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluorochemicals are used to impart water and oil repellency, then surface repellency is achieved, but thermal stability above 200 °C is insufficient
Solution Approach 1:
The patent changes the chemical parameters of the fluorochemicals by incorporating them into polymeric structures with specific backbone compositions (polyester, polyether, polyurethane, or polycarbonate). This structural modification raises the degradation temperature from below 200 °C to above 200 °C while maintaining the fluorochemical surface properties that provide water and oil repellency.
Solution Approach 2:
The invention creates composite molecular structures where fluorochemical functional groups are combined with thermally stable polymeric backbones. The resulting surface modifying macromolecules integrate the repellency function of fluorochemicals with the thermal stability of engineered polymers, achieving both water/oil repellency and high-temperature processing capability.
2Productivity
If high-temperature processing is used for base polymers, then manufacturing capability is improved, but existing fluorochemicals decompose
Solution Approach 1:
The patent modifies the thermal parameter of the fluorochemicals by changing their molecular architecture from small molecules to high-molecular-weight polymers. This structural parameter change increases the decomposition temperature to above 200 °C, enabling compatibility with high-temperature base polymer processing while maintaining chemical stability during extrusion and fabrication.
3Ease of operation
If topical application of fluorochemicals is used, then water and oil repellency is achieved, but thermal processing above 200 °C causes degradation
Solution Approach 1:
The invention creates composite surface modifying macromolecules that combine fluorochemical surface-active groups with thermally stable polymeric backbones. These composite molecules can be applied topically or incorporated into base polymers and maintain stability at processing temperatures above 200 °C, unlike conventional small-molecule fluorochemicals that decompose under such conditions.
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 SMMs provide thermal stability up to 400 °C, enabling the production of articles with enhanced water and oil repellency and resistance, suitable for high-temperature processing conditions, ensuring durability and functionality in medical and industrial applications.
Implementation Method 1
Surface modifiers of formula (I) can have a thermal degradation temperature of at least 200, 205, 210, 215, 220, 225, 230, 235, 240, 245, 250 255, 260, 265, 270, 275, 280, 285, 290, 295, 300, 305, 310, 315, 320, 325, 330, 335, 340, 345, 350, 355, 360, 365, 370, 375, 380, 385, 390, 395, 400, 405, 410, 415,420, 425, 430, 435, 440, 445, or even 350 °C
Implementation Method 2
Various fluorochemicals have been used to impart water and oil repellency, as well as soil resistance, to a variety of substrates
Data Source
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AI summary
The invention relates to surface modifying macromolecules (SMMs) having high degradation temperatures and their use in the manufacture of articles made from base polymers which require high temperature processing. The surface modifier is admixed with the base polymer to impart alcohol and water repellency properties.