Thermoplastic Polyurethane Moisture Resistance
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Solution Overview
Problem
Thermoplastic polyurethanes (TPUs) face challenges with high moisture absorption, lower rigidity at elevated temperatures, and limited strength at high elongation, which are not adequately addressed by existing formulations.
Innovation Solution
A linear thermoplastic polyurethane is developed, comprising specific poly(phenylene ether) and diisocyanate repeat units, with a structure that includes halogen, hydrocarbylthio, hydrocarbyloxy, and halohydrocarbyloxy groups, forming urethane moieties to enhance moisture resistance, heat resistance, and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional TPU formulations are used, then the material exhibits good general performance including impact strength and abrasion resistance, but the material suffers from high moisture absorption
Solution Approach 1:
The patent changes the chemical composition parameters of the polyol component by incorporating poly(phenylene ether) units with specific structures (Q1, Q5, R1, R3 groups) to reduce moisture absorption. This chemical parameter modification directly addresses the high moisture absorption issue while maintaining TPU's elastomeric properties
Solution Approach 2:
The patent creates a composite polymer structure by combining poly(phenylene ether) units with diisocyanate and diol components to form a novel TPU formulation. This composite approach integrates the moisture resistance of poly(phenylene ether) with the elastomeric properties of traditional TPU
2Temperature
If conventional TPU formulations are used, then the material provides good elastomeric properties, but the material exhibits lower rigidity at elevated temperatures
Solution Approach 1:
The patent modifies the thermal parameters of the TPU by incorporating aromatic poly(phenylene ether) units which inherently provide higher thermal stability. This structural parameter change enables the material to maintain rigidity at elevated temperatures while preserving elastomeric behavior at service temperatures
3Strength
If conventional TPU formulations are used, then the material achieves adequate mechanical properties, but the material shows limited strength at high elongation
Solution Approach 1:
The patent develops a composite polymer architecture combining the flexibility of aliphatic chains with the strength of aromatic poly(phenylene ether) units. This composite structure enables the material to achieve superior strength at high elongation levels, exceeding the performance of conventional TPU formulations
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 thermoplastic polyurethane exhibits reduced moisture absorption, increased heat resistance, and improved strength at high elongation, making it suitable for various applications including films, cable sheathing, and automotive components.
Implementation Method 1
The isocyanate groups of the diisocyanate react with the hydroxyl groups on the diol to form a urethane linkage
Data Source
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AI summary
A thermoplastic polyurethane is formed by the reaction of a specific hydroxy-diterminated poly(phenylene ether) and an organic diisocyanate. The polyurethaneforming reaction optionally employs diols other than the hydroxy-diterminated poly(phenylene ether). Compared to thermoplastic polyurethanes lacking the residue of the hydroxy-diterminated poly(phenylene ether), the thermoplastic polyurethanes described herein exhibit properties including one or more of improved heat and oxidation resistance, improved resistance to acids, bases, and solvent, and reduced water absorption.