Atmospheric p-xylylene Copolymerization via Carver Process
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Solution Overview
Problem
The existing methods for producing p-xylylene polymers, such as the Gorham process, require costly subatmospheric pressure environments and are not conducive to adding polymerizable molecules during formation, limiting the functionality of the resulting p-xylylene products.
Innovation Solution
A process, referred to as the Carver Process, which converts p-xylene into p-xylylene in the presence of N2O or reactive oxygen at atmospheric pressure, allowing for the introduction of secondary monomers in the vapor phase for copolymerization, enabling the production of functionalized copolymers and composite materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the Gorham process is used to produce p-xylylene polymers, then polymer formation is achieved, but costly subatmospheric pressure environments are required
Solution Approach 1:
The patent changes the pressure parameter from subatmospheric (Gorham process) to atmospheric pressure, fundamentally simplifying the equipment requirements and reducing production costs while maintaining polymer formation capability
Solution Approach 2:
The patent employs inexpensive reagents such as oxygen and p-xylene instead of costly specialized reagents, making the process economically viable for large-scale production
2Adaptability or versatility
If the Gorham process is used to produce p-xylylene polymers, then polymer formation is achieved, but functionality is limited due to inability to add polymerizable molecules
Solution Approach 1:
The patent combines p-xylylene formation with copolymerization in a single atmospheric pressure process, allowing secondary monomers to be incorporated during formation, thereby enhancing polymer functionality without adding process steps
Solution Approach 2:
The patent creates a multi-functional process that simultaneously achieves p-xylylene formation, copolymerization, and functionalization, making the process adaptable to various applications by selecting different secondary monomers
3Ease of manufacture
If vacuum vapor deposition is used for xylylene copolymeric thin films, then thin film formation is achieved, but expensive vacuum equipment is required
Solution Approach 1:
The patent changes the pressure parameter from vacuum to atmospheric pressure, eliminating expensive vacuum equipment while maintaining thin film formation capability through controlled vapor phase reactions
Solution Approach 2:
The patent employs self-organizing vapor phase condensation and polymerization processes that automatically form uniform thin films without requiring complex vacuum control systems
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
This method reduces production costs and enhances the functionality of p-xylylene polymers by enabling the formation of copolymers and composite materials with improved properties, suitable for various applications including film coatings, electronic components, and biological coatings.
Implementation Method 1
A process to make a xylylene monomer or other monomer according to principles of the invention, is referred to herein as the Carver Process. The process converts p-xylene into p-xylylene in the presence of N2O or a reactive oxygen
Implementation Method 2
which polymerize to form poly-p-xylylene (also known as parylene) polymers and copolymers
Implementation Method 3
The monomer is referred to as Puralene monomer. With modifications to the reactor described in U.S. Pat. No. 8,633,289, a second monomer is introduced in the vapor phase, and the combined gases are co-deposited on a substrate
Data Source
AI summary
A gaseous p-xylylene monomer, formed by reacting xylene with a monatomic oxygen source, is mixed with a functional gaseous monomer. The resulting mixture may be deposited and solidified on a substrate, which may optionally be exposed to a photoinitiating light energy and/or a permittivity enhancing electric or magnetic field. Alternatively, the resulting gaseous mixture may be trapped and condensed in a condenser, which may contain a solvent to facilitate trapping. The condensate may be mixed with a tertiary substance, e.g., another monomer, a reactive substance or an inert material.