Alternating Phenylene Silicon Siloxane Polymer Synthesis
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Solution Overview
Problem
Conventional halogen-containing non-inflammable agents are toxic and environmentally harmful, while halogen-free silicon-containing agents face compatibility issues with polymer substrates, leading to high production costs and inefficiencies in the production of polymers with alternating phenylene silicon and siloxane structures, which are not suitable for mass production due to complex processing and purification requirements.
Innovation Solution
A method for producing a phenylene disilanol monomer through an autonomous synthesis process using cheap raw reactants, eliminating the need for banned solvents and intricate purification steps, allowing for mass production of a polymer with alternating phenylene silicon and siloxane structure using a simple centrifugal separation technique.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If halogen-containing non-inflammable agents are used, then flame retardation efficiency is improved, but toxicity and environmental harm increase
Solution Approach 1:
The patent replaces expensive and harmful halogen-containing flame retardants with a cost-effective halogen-free alternative. The phenylene disilanol monomer and resulting polymer provide sustainable flame protection without the toxic decomposition products of conventional halogenated agents, eliminating environmental harm while maintaining safety functionality.
2Object-affected harmful factors
If halogen-free silicon-containing non-inflammable agents are used, then toxicity is reduced, but compatibility with polymer substrates deteriorates
Solution Approach 1:
The patent introduces phenyl groups at specific positions in the siloxane chain to create localized aromatic regions that enhance compatibility with polymer substrates. This local modification of the silicone structure improves interfacial adhesion and compatibility without compromising the overall halogen-free, low-toxicity characteristics of the material.
3Reliability
If organosiloxane with additives is used, then flame retardation is enhanced, but processibility and appearance deteriorate due to water release and bubble formation
Solution Approach 1:
The patent creates a composite structure by incorporating phenyl groups into the siloxane backbone, forming a hybrid organic-inorganic polymer system. This composite approach provides inherent flame retardation through the aromatic content while maintaining the flexibility and processibility of the silicone matrix, eliminating the need for separate additives that cause bubbling.
4Productivity
If conventional polymerization methods are used, then polymer production is achieved, but production cost and complexity increase due to intricate purification requirements
Solution Approach 1:
The patent employs extraction chromatography using a specific solvent system to selectively separate the phenylene disilanol monomer from reaction byproducts and impurities. This extraction method efficiently purifies the monomer in a single step, dramatically simplifying the purification process and reducing production complexity while maintaining high monomer purity for polymer synthesis.
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 method achieves high-purity phenylene disilanol with a yield of at least 80%, reducing production costs and enabling industrial-scale production of a thermally stable, non-inflammable polymer suitable for various applications, with a 5% weight loss temperature of 400-500°C and a stable charring residue at 700°C, thus overcoming the limitations of existing technologies.
Implementation Method 1
MacKnight and others performed polycondensation with recrystallized para-phenylene disilanol and high-purity diamino silane to produce a polymer with alternating para-phenylene silicon and siloxane structure
Implementation Method 2
the main chain of silicone rubber usually builds with rigid organic aryl groups, such as phenylene, to increase the insulating charring layer content generated during combustion, and in consequence a dense and stable silicon-containing charring protective layer will be formed firmly on the surface of the substrate
Implementation Method 3
the polymer thus produced is tested by thermal analysis, and the molecular weight of the polymer is analyzed by gel permeation chromatography (GPC); the results show that the process method produces a thermally-satisfactory non-inflammable polymer
Data Source
AI summary
A polymer with alternating phenylene silicon and siloxane structure and a method of producing a precursor of the same are introduced to develop an autonomous synthesis process for para-phenylene disilanol monomer compounds and design a technique of purifying the polymer with alternating phenylene silicon and siloxane structure easily, so as to enable mass production of the polymer with alternating phenylene silicon and siloxane structure.