Curable Polysiloxane Compatibility and Property Retention
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Solution Overview
Problem
Reactive polysiloxanes often exhibit poor compatibility with other components in compositions, leading to issues like haze and a loss of physical properties such as comparative tracking index, tensile modulus, and low temperature impact resistance.
Innovation Solution
A polysiloxane with a specific structural formula, allowing for improved compatibility and retention of physical properties through the use of specific R groups and functional groups, and the incorporation of a polysiloxane in a curable composition with an initiator and optional crosslinkers or fillers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pendent groups are added to reactive polysiloxanes to improve compatibility with other components, then compatibility improves, but physical properties such as tensile strength, modulus, and low temperature impact resistance deteriorate
Solution Approach 1:
The patent applies local quality by introducing pendent groups at specific locations along the polysiloxane chain rather than uniformly modifying the entire structure. The pendent groups are attached at controlled densities and positions, allowing compatibility improvement at specific sites while preserving the core chain structure that provides mechanical strength. This localized modification resolves the contradiction by making the improvement targeted rather than global.
Solution Approach 2:
The patent creates a composite structure within the polysiloxane molecule by combining the base polysiloxane chain with pendent functional groups. This molecular-level composite structure allows the material to exhibit both the compatibility characteristics of the pendent groups and the mechanical properties of the polysiloxane backbone, effectively resolving the trade-off between compatibility and physical properties.
2Stability of the object's composition
If polysiloxane chains with dimethylsiloxy repeat units are used, then the polysiloxane structure is simple and stable, but compatibility with other organic polymers deteriorates resulting in poor clarity
Solution Approach 1:
The patent changes the chemical parameters of the polysiloxane by introducing pendent groups with specific functional characteristics. This parameter change modifies the polarity, steric properties, and intermolecular interaction capabilities of the polysiloxane, enabling it to compatibilize with organic polymers while maintaining the stable dimethylsiloxy repeat unit backbone structure.
3Adaptability or versatility
If pendent groups are introduced to improve compatibility, then haze decreases, but partial molar volume changes resulting in loss of physical properties
Solution Approach 1:
The patent applies local quality by introducing pendent groups at specific locations along the polysiloxane chain rather than uniformly modifying the entire structure. The pendent groups are attached at controlled densities and positions, allowing compatibility improvement at specific sites while preserving the core chain structure that provides mechanical strength. This localized modification resolves the contradiction by making the improvement targeted rather than global.
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 polysiloxane composition achieves enhanced thermal stability, high heat distortion temperature, flame resistance, and improved paintability without compromising transparency, addressing the compatibility and property retention issues of previous reactive polysiloxanes.
Implementation Method 1
reactive polysiloxanes and their use in curable compositions and applications containing the same... polysiloxane components are used, they often experience poor compatibility with the other components, resulting in poor clarity (haze)
Data Source
AI summary
There is provided herein a curable polysiloxane composition comprising a reactive polysiloxane having the general structural formula (I): as described herein. There is provided a method of making the polysiloxane. In addition there is provided a curable composition including the polysiloxane.