Polysiloxazane Compound Liquid-Liquid Separation
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Solution Overview
Problem
Polysilazane compounds synthesized using dimethyldichlorosilane or methyldichlorosilane exhibit poor workability due to their linear structure and require inefficient filtration for byproduct removal, leading to low productivity and high reactivity issues.
Innovation Solution
Introducing a polysiloxazane compound with a repeating unit structure that includes a siloxane moiety, allowing for liquid-liquid separation with an alkaline aqueous solution to remove ammonium chloride byproducts, enhancing solubility and curability while minimizing solvent use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alkyltrichlorosilane or tetrachlorosilane is used to introduce three-dimensional bridged structure, then curability is improved, but solubility deteriorates and solid precipitation occurs during liquid-liquid separation
Solution Approach 1:
The patent uses composite silane structures combining both three-dimensional bridging units (for curability) and siloxane units (for solubility). Specifically, the copolymer includes units from methyltrichlorosilane/tetrachlorosilane and units from cyclic siloxanes, creating a composite material that achieves both excellent curability and solubility without solid precipitation during processing
Solution Approach 2:
The patent controls the molar ratio of different silane units to optimize both curability and solubility. By adjusting the proportion of three-dimensional bridging units versus siloxane units, the invention finds the optimal parameter range where sufficient crosslinking density is achieved while maintaining adequate solubility and preventing precipitation during liquid-liquid separation
2Object-generated harmful factors
If filtration is used to remove ammonium chloride byproduct, then byproduct removal is achieved, but productivity deteriorates due to low efficiency and long processing time
Solution Approach 1:
The patent replaces the mechanical filtration system with a liquid-liquid separation system using alkaline aqueous solution. This substitution eliminates the need for filtration equipment and operations, dramatically improving productivity while effectively removing ammonium chloride byproducts through chemical reaction and phase separation
3Device complexity
If linear polysilazane structure is used, then synthesis simplicity is maintained, but workability deteriorates due to poor curability
Solution Approach 1:
The patent segments the polymer structure into repeating units with different functions: some units provide linear connectivity while others introduce three-dimensional bridging. This segmentation allows the polymer to maintain processability from simple linear segments while developing crosslinked network structure for excellent curability upon curing
Solution Approach 2:
The patent pre-introduces potential crosslinking sites (chlorine atoms and three-dimensional bridging units) during synthesis, which remain dormant during processing but become active during curing. This preliminary action allows the material to be processed as a linear polymer while having the capability to form a crosslinked network structure when needed
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 polysiloxazane compound achieves excellent solubility and curability, facilitating efficient production and fast film formation, as well as preventing solid precipitation during liquid-liquid separation.
Implementation Method 1
when an alkaline aqueous solution is added, hydrolytic condensation can proceed
Implementation Method 2
a method for removing ammonium chloride in which an alkaline aqueous solution is added to the reactant and the resulting mixture is subjected to liquid-liquid separation
Data Source
AI summary
A polysiloxazane compound including a repeating unit of the following general formula (1), and having a number average molecular weight of 500 to 100,000 as measured by gel permeation chromatography versus polystyrene standards,wherein R1 and R2 each independently represent a substituted or unsubstituted C1-C50 monovalent hydrocarbon group optionally containing a hetero atom, Xs each independently represent a methyl group, an oxygen atom, NH—SiX2, or (NH)(3-r)/2—SiR1R2r (R1 and R2 have the same meaning as provided above), or Xs are joined to one another to represent an oxygen atom, n is an integer of 0 to 8, when the number of NH—SiX2 is denoted by p, p satisfies 0≤p/(2n+4)≤0.5, r is an integer of 0, 1, or 2, and a and b are numbers satisfying 0<a≤1, 0≤b<1, and a+b=1.