Polymeric Material Cryogenic Ductility
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Solution Overview
Problem
Polymeric materials face challenges in low temperature applications due to low mobility of polymer chains, leading to brittle failure and rapid crack propagation under load, especially in cryogenic conditions like LNG storage, where common materials fail to maintain mechanical and chemical resistance.
Innovation Solution
A polymeric material with a specific repeat unit structure, including a phenylene moiety and high melt viscosity, is developed to enhance mechanical and chemical resistance, suitable for temperatures below -50°C, and potentially as low as -165°C, addressing the limitations of existing polymers like PEEK in such extreme conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If common polymeric materials are used in low temperature applications, then processability is improved, but mechanical properties and ductility deteriorate due to low polymer chain mobility
Solution Approach 1:
The patent changes the chemical structure parameters of the polymer by incorporating specific aromatic moieties (phenylene, diphenylene) and carbonyl groups in defined ratios. This structural modification alters the polymer chain flexibility and intermolecular forces, enabling the material to maintain both processability at manufacturing temperatures and superior mechanical properties at cryogenic temperatures down to -196°C
Solution Approach 2:
The patent creates a composite molecular structure within the polymer chain itself, combining rigid aromatic segments for strength with flexible ether linkages for chain mobility. The specific repeat unit structure integrates multiple functional groups (ether, carbonyl, phenylene) that work synergistically to provide both processability and low-temperature mechanical performance
2Stability of the object's composition
If polymeric materials with high chain mobility are used to improve ductility at low temperature, then resistance to brittle failure improves, but mechanical strength and abrasion resistance deteriorate
Solution Approach 1:
The patent modifies the polymer structure by controlling the ratio of rigid aromatic components to flexible ether linkages. The specific repeat unit with phenylene and carbonyl groups in defined proportions creates optimal chain stiffness for strength while maintaining sufficient mobility for ductility at -196°C, achieving both high mechanical strength and resistance to brittle failure
Solution Approach 2:
The patent introduces local structural variations within the polymer chain by positioning specific functional groups (ether oxygens, carbonyl groups) at defined intervals along the backbone. This local structural quality control allows different regions of the polymer to contribute differently - rigid segments for strength and flexible segments for ductility - achieving simultaneous improvement in both properties
3Reliability
If traditional polymers like PEEK are used, then chemical resistance is improved, but performance at very low temperatures below -50°C deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating specific aromatic moieties and carbonyl groups in defined ratios, creating a polymer structure that maintains the chemical resistance characteristics of traditional polymers like PEEK while adding the low-temperature performance capability through controlled chain flexibility and intermolecular interactions
Solution Approach 2:
The patent segments the polymer structure into distinct functional units within the repeat - aromatic rings for chemical resistance and stability, ether linkages for flexibility and low-temperature performance. This segmentation allows each component to contribute its specific property, achieving both chemical resistance and cryogenic performance simultaneously
Data Source
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AI summary
An assembly or apparatus for use in relation to an assembly, wherein said assembly is subjected to a temperature of less than -50°C in use, wherein said assembly or apparatus includes a component which comprises a polymeric material (A) having a repeat unit of formula -O-Ph-O-Ph-CO-Ph- (I) wherein Ph represents a phenylene moiety; and wherein said polymeric material (A) has a melt viscosity of at least 0.50 kNsm-2 .