Rotaxane Polyurethane Stress Dispersion
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Solution Overview
Problem
Conventional polyurethanes lack the mechanical properties and stress dispersion capabilities required for enhanced toughness and abrasion resistance, particularly due to limitations in their crosslinking structures.
Innovation Solution
A novel rotaxane with a crown ether and a chain molecule piercing through the cyclic structure, featuring hydroxyl groups at the terminal and on the cyclic structure, is integrated into a polyurethane formulation, allowing for improved mechanical properties through stress dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polyurethane crosslinking structures are used, then the polymer can be formed, but the mechanical properties and stress dispersion capabilities are insufficient
Solution Approach 1:
The patent employs a rotaxane structure where the chain molecule can move dynamically within the crown ether cyclic structure. This dynamic movement allows the polymer to disperse stress effectively while maintaining strong mechanical properties, resolving the contradiction between strength and stress dispersion capability.
Solution Approach 2:
The patent creates a composite crosslinking structure combining crown ether cyclic molecules with chain molecules to form rotaxane units. This composite structure provides both the strength needed for mechanical integrity and the flexibility required for stress dispersion, simultaneously improving both parameters.
2Reliability
If the crown ether structure is made movable within the polymer chain, then stress dispersion is improved, but the structural stability may be compromised
Solution Approach 1:
The patent segments the polymer structure into distinct rotaxane units where the crown ether cyclic structure is separated from the main polymer chain by blocking structures. This segmentation allows the cyclic structure to move freely for stress dispersion while the blocking structures maintain overall structural stability.
Solution Approach 2:
The blocking structures act as intermediaries between the movable crown ether cyclic structure and the polymer chain. These intermediaries allow the cyclic structure to move for stress dispersion while preventing complete disassociation, thus maintaining structural stability.
3Strength
If the chain molecule pierces through the cyclic structure, then crosslinking is achieved, but the terminal functionality is limited
Solution Approach 1:
The patent extracts the hydroxyl group functionality from the chain ends of the rotaxane structure, allowing these terminal hydroxyl groups to participate in polyurethane formation. This extraction maintains the crosslinking capability provided by the piercing chain molecule while adding versatility through terminal functionality.
Data Source
AI summary
An object of the present invention is to provide a novel rotaxane and a polyurethane using the same. The present invention provides a rotaxane having a crown ether and a chain molecule piercing through the cyclic structure of the crown ether, wherein a hydroxyl group exists at one terminal of the chain molecule, and a hydroxyl group bonds to the cyclic structure of the crown ether. The present invention further provides a polyurethane using the rotaxane as a polyol component.