Amine-Functionalized Cycloaliphatic Polysiloxanes Synthesis
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Solution Overview
Problem
Existing materials struggle to achieve a balance between flexibility and durability, often sacrificing one property for the other, and amine functionalized cycloaliphatic polysiloxanes have been unknown due to difficulties in preparation, limiting their use in applications requiring both flexibility and thermal/chemical resistance.
Innovation Solution
The synthesis of amine-functionalized cyclo-aliphatic silicone oligomers through base-catalyzed ring-opening reactions or hydrosilation of cycloaliphatic silicone oligomers with blocked diamines, allowing for molecular weight control and the use of various crosslinking agents, while maintaining amine functionality and avoiding steric effects of bulky cycloaliphatic substituents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If epoxy resin molecular weight is increased to improve durability, then durability is improved, but viscosity increases and heat resistance decreases
Solution Approach 1:
The patent creates composite materials by blending epoxy resins with polysiloxane modifiers. The polysiloxane component introduces Si-O bonds that provide thermal stability and oxidative resistance, while the epoxy component maintains durability. This composite approach allows simultaneous improvement of heat resistance and durability that cannot be achieved by increasing epoxy molecular weight alone.
Solution Approach 2:
The patent changes the chemical composition parameters of the resin system by incorporating polysiloxane segments with specific molecular weights and functionalities. By adjusting the ratio of epoxy to polysiloxane components and selecting different polysiloxane chain lengths, the formulation optimizes both heat resistance and durability without the viscosity penalties associated with high molecular weight epoxy alone.
2Ease of operation
If flexible backbone segments are incorporated to improve flexibility, then flexibility is improved, but heat and chemical resistance is sacrificed
Solution Approach 1:
The patent combines flexible polysiloxane backbone segments with heat-resistant epoxy and amine components. The polysiloxane provides flexibility through its flexible Si-O-Si backbone, while the epoxy-amine crosslinked network maintains heat and chemical resistance. This composite structure achieves both flexibility and reliability simultaneously.
Solution Approach 2:
The patent applies local quality by having different regions of the polymer chain perform different functions: the polysiloxane backbone segments provide flexibility in the chain regions, while the epoxy-amine crosslinked regions provide heat and chemical resistance at the crosslink points. This spatial differentiation of properties allows simultaneous achievement of flexibility and heat resistance.
3Adaptability or versatility
If amine functionalized cycloaliphatic polysiloxanes are synthesized, then molecular weight control and compatibility are improved, but preparation difficulty increases due to steric effects
Solution Approach 1:
The patent segments the synthesis process into distinct stages: first forming the cycloaliphatic polysiloxane backbone, then separately introducing amine functional groups through controlled reactions. This segmentation allows molecular weight to be controlled during the backbone formation stage, while amine functionality is added later without interfering with the polymerization, thereby reducing preparation difficulty despite steric effects.
Solution Approach 2:
The patent performs preliminary action by pre-forming the cycloaliphatic polysiloxane structure with controlled molecular weight before introducing the amine functional groups. This preliminary formation of the backbone structure allows subsequent functionalization to proceed more easily, avoiding the steric hindrance problems that would arise if amine groups were introduced during polymerization.
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 materials exhibit improved glass transition temperatures, mechanical properties, and compatibility with other coating resins, enabling the production of flexible, durable, and thermally stable films with enhanced adhesion and chemical resistance.
Implementation Method 1
an amine functionalized silicone is prepared through a base-catalyzed ring-opening reaction
Implementation Method 2
an amine functionalized silicone is prepared through the hydrosilation of a silicone oligomer through the blocking and deblocking of an amine terminated in a vinyl group
Data Source
AI summary
The present invention relates to novel amine terminated cycloaliphatic polysiloxanes, and preparations thereof. More particularly, the invention provides several reaction schemes for the synthesis of amino-functionalized cyclo-aliphatic silicones and the products produced by the reaction schemes. In one embodiment of the invention, an amine functionalized silicone is prepared through a base-catalyzed ring-opening reaction. In another embodiment of the invention, an amine functionalized silicone is prepared through the hydrosilation of a silicone oligomer through the blocking and deblocking of an amine terminated in a vinyl group.