Aromatic Polysulfone Resin Heat Shrinkage Reduction
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Solution Overview
Problem
Aromatic polysulfone resin-based hollow fiber membranes experience cracks due to high heat shrinkage rates during sterilization and use, affecting their integrity and performance in applications like artificial dialysis.
Innovation Solution
Development of an aromatic polysulfone resin with a specific molar ratio of repeating units, which reduces the heat shrinkage rate of the membrane, preventing cracks and maintaining structural integrity under high temperature and pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If aromatic polysulfone resin is used for hollow fiber membrane, then good heat resistance and chemical resistance are achieved, but high heat shrinkage rate causes cracks during sterilization
Solution Approach 1:
The patent changes the chemical composition parameters of the aromatic polysulfone resin by introducing a specific repeating unit structure with controlled molar ratios. This modifies the resin's thermal properties to reduce heat shrinkage while maintaining heat resistance, directly addressing the contradiction between thermal stability and shrinkage-induced cracking.
Solution Approach 2:
The patent creates a composite resin system by combining multiple repeating units (Formula I and Formula II) in specific proportions. This composite approach allows the material to inherit the heat resistance of polysulfone while the specific unit combination suppresses heat shrinkage, resolving the contradiction between these two properties.
2Reliability
If hollow fiber membrane is subjected to steam sterilization, then sterilization is achieved, but cracks occur due to heat shrinkage under high temperature and pressure
Solution Approach 1:
The patent applies preliminary anti-action by pre-modifying the resin composition to counteract the harmful effect of heat shrinkage before sterilization occurs. The specific repeating unit structure is designed in advance to resist thermal contraction, preventing crack formation during subsequent steam sterilization processes.
Solution Approach 2:
The patent modifies the thermal parameters of the membrane material by adjusting the resin composition. This changes the membrane's thermal expansion characteristics to minimize dimensional changes during sterilization, thereby maintaining structural integrity and preventing cracking while allowing sterilization to proceed.
3Ease of manufacture
If membrane is heated during manufacturing or use, then processing is enabled, but heat shrinkage causes cracks in both hollow fiber and flat membranes
Solution Approach 1:
The patent changes the thermal parameters of the membrane material through resin composition modification. This allows the membrane to undergo necessary heating during manufacturing and use without excessive shrinkage, as the specific repeating unit structure provides thermal stability that prevents crack formation while still enabling processing.
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 aromatic polysulfone resin with a targeted molar ratio of 1:2,000 to 1:200 for the repeating units significantly lowers the heat shrinkage rate of the membrane, minimizing the occurrence of cracks and ensuring the membrane's stability during sterilization and use.
Implementation Method 1
the hollow fiber membrane may be sterilized... under high temperature and high pressure conditions of a temperature of 121 °C and a pressure of 0.2 MPa. In this case, in a case where the hollow fiber membrane has a high heat shrinkage rate, cracks may occur in the hollow fiber membrane due to the heat shrinkage of the hollow fiber membrane
Data Source
AI summary
An aromatic polysulfone resin having a repeating unit represented by Formula (I) and a repeating unit represented by Formula (II), in which a ratio (m:n) of a molar content (m) of the repeating unit represented by Formula (I) to a molar content (n) of the repeating unit represented by Formula (II) is 1:2,000 to 1:200. wherein hydrogen atoms of phenylene groups of Formulae (I) and (II) may be each independently substituted with an alkyl group, an aryl group, or a halogen atom.