Rotaxane Compound Silane Coupling Agent for Polymer Composites
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Solution Overview
Problem
Many rotaxane network polymers (RCPs) have limited versatility and application due to their crosslinking nature, and there is a need for a functional rotaxane compound with controlled properties that can act as a silane coupling agent.
Innovation Solution
A rotaxane compound is developed, featuring cyclic molecules and an axial molecule with specific functional groups capable of reacting with silica and carbon-carbon unsaturated bonds, allowing it to function as a silane coupling agent and impart dynamic characteristics to compounded compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rotaxane network polymers are used for crosslinking, then mechanical strength and elasticity are improved, but versatility and application range are limited
Solution Approach 1:
The patent segments the rotaxane structure into distinct functional components: the cyclic molecule (crown ether) provides the crosslinking capability through silica interaction, while the axial molecule contains the polymer-reactive functional group (vinyl, epoxy, or carboxyl). This segmentation allows the rotaxane to function as a crosslinking agent while maintaining versatility in polymer compatibility.
Solution Approach 2:
The rotaxane compound is designed with multi-functionality: it can react with silica surfaces through the crown ether cyclic molecule, while simultaneously providing multiple options for polymer reaction (vinyl, epoxy, or carboxyl groups on the axial molecule). This universal design enables application across different polymer systems and reinforcement scenarios.
2Strength
If crosslinked polymer structures are created, then mechanical properties are enhanced, but control over material properties becomes difficult
Solution Approach 1:
The patent applies local quality by placing specific functional groups at defined positions within the rotaxane structure. The cyclic molecule is positioned to interact with silica, while the axial molecule's functional groups (vinyl, epoxy, or carboxyl) are positioned to react with polymer matrices. This localized functional distribution enables precise control over the crosslinking behavior and resulting material properties.
Solution Approach 2:
The patent utilizes parameter changes by varying the functional groups on the axial molecule (vinyl, epoxy, or carboxyl) and the structure of the cyclic molecule (different crown ether variants) to tune the properties of the resulting crosslinked material. This allows systematic control over crosslinking density, polymer compatibility, and final material characteristics.
3Stability of the object's composition
If silane coupling agents are used to improve dispersion, then filler-polymer compatibility is enhanced, but dynamic characteristics are reduced
Solution Approach 1:
The rotaxane compound represents a composite molecular structure combining the crown ether cyclic molecule (for silica interaction and dispersion improvement) with the functionalized axial molecule (for polymer compatibility and dynamic characteristics). This molecular-level composite design allows simultaneous achievement of good dispersion and retained dynamic properties.
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 rotaxane compound effectively enhances the mechanical properties and dispersion of polymer compositions, leading to improved viscosity, storage elasticity, loss tangent, mechanical strength, and abrasion resistance.
Implementation Method 1
one functional group of a silane coupling agent reacts with silanol on a surface of the filler, thereby decreasing an interaction between the fillers by the silanol and improving dispersion
Implementation Method 2
another functional group reacts with the polymer, thereby coupling the filler with the polymer via the silane coupling agent
Implementation Method 3
Rotaxane is a supramolecular compound having a chain molecule as an axial component and a cyclic molecule as a ring component being coupled by a spatial bonding without a covalent bond, and each of constituent elements is not subject to limitation of a bond length and a bond angle and has a high degree of freedom and mobility
Data Source
AI summary
A rotaxane compound comprising one or more cyclic molecules and an axial molecule penetrating through inner holes of the cyclic molecules and having cap structures disposed lest the cyclic molecules should be detached, where one of the cyclic molecule and the axial molecule has one of a functional group being capable of reacting with silica and a functional group being capable of reacting with a carbon-carbon unsaturated bond, and the other of the cyclic molecule and the axial molecule has the other of the functional group being capable of reacting with silica and the functional group being capable of reacting with a carbon-carbon unsaturated bond.