Organic-Inorganic Composite Particles via Plasma Treatment
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Solution Overview
Problem
Conventional methods for producing organic-inorganic composite particles face challenges such as insufficient dispersibility, low organic polymer content, and complex multi-stage production processes, particularly when attempting to coat inorganic particles with organic polymers without using coupling agents or conducting modification treatments.
Innovation Solution
A method involving living radical polymerization to form hydrophilic and hydrophobic polymer blocks on the surfaces of inorganic particles without modification treatments, using specific monomers and solvents to achieve a stable two-layer organic polymer structure with high dispersibility, allowing for mass production without the need for polymerizable reactive groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If coupling agents are used to introduce polymerizable reactive groups onto inorganic particle surfaces, then organic polymer coating is achieved, but the intrinsic physical properties and functions of inorganic particles cannot be sufficiently exhibited
Solution Approach 1:
The invention extracts and removes the coupling agent from the composite particle structure, achieving polymer coating directly on inorganic particles without intermediate coupling layers. This is accomplished by introducing polymerizable reactive groups through ozone or plasma treatment, then directly polymerizing monomers onto the treated surfaces, eliminating the coupling agent and preserving the intrinsic properties of inorganic particles while achieving sufficient coating uniformity.
2Manufacturing precision
If coupling agents are used to coat inorganic particles with organic polymer, then polymer coating is achieved, but the packing fraction of inorganic particles decreases
Solution Approach 1:
The invention removes the coupling agent layer that occupies space between inorganic particles, directly coating organic polymer onto the inorganic particle surfaces through plasma-treated reactive groups. This extraction of the intermediate coupling layer reduces the total volume occupied by non-structural components, thereby increasing the packing fraction of inorganic particles in the composite while maintaining adequate polymer coating coverage.
3Manufacturing precision
If coupling agents are used to bond inorganic particles and organic polymer, then composite formation is achieved, but dispersibility in solvent is insufficient
Solution Approach 1:
The invention extracts the coupling agent that creates poor solvent dispersibility, achieving direct bonding between inorganic particles and organic polymer through plasma-introduced reactive groups. The resulting composite structure maintains integrity through direct covalent bonds while improving solvent dispersibility by eliminating the coupling agent layer that hindered solvent penetration and particle separation.
Solution Approach 2:
The invention changes the surface chemistry parameters of inorganic particles through ozone or plasma treatment, introducing polymerizable reactive groups that enable direct polymerization. This parameter change in surface functionality allows direct bonding without coupling agents, thereby improving solvent dispersibility while maintaining composite structure integrity.
4Manufacturing precision
If multi-stage production process with coupling agents is used, then polymer coating is achieved, but mass production becomes difficult
Solution Approach 1:
The invention merges the surface treatment and polymer coating steps into a single integrated process. Plasma or ozone treatment introduces reactive groups directly onto inorganic particle surfaces, and monomer polymerization occurs in the same reaction system without separate coupling agent application steps. This merging of processes reduces production stages, simplifies the workflow, and enables mass production while maintaining polymer coating quality.
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 approach results in organic-inorganic composite particles with excellent solvent dispersibility and high organic polymer content, enabling efficient and cost-effective large-scale production while maintaining the intrinsic properties of both inorganic and organic components.
Implementation Method 1
a hydrophilic block (A) arranged on the surfaces of the inorganic particles and made of a first polymer
Implementation Method 2
the inorganic particles, the first polymer, and the second polymer have surface free energies satisfying a condition expressed by the following formula (1): ENP>EA>EB
Data Source
AI summary
Organic-inorganic composite particles including: inorganic particles; and an organic polymer, wherein the inorganic particles have surfaces on which no modification treatment for introducing a polymerizable reactive group is conducted, the organic polymer comprises a hydrophilic block arranged on the surfaces of the inorganic particles and made of a first polymer, and a hydrophobic block stacked on an outside of the hydrophilic block and made of a second polymer, and the inorganic particles, the first polymer, and the second polymer have surface free energies satisfying a condition expressed by the following formula:ENP>EA>EB [in the formula, ENP represents the surface free energy of the inorganic particles, EA represents the surface free energy of the first polymer, and EB represents the surface free energy of the second polymer].