Template-Free Polyimide Hollow Particles via Emulsion Imidization
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Solution Overview
Problem
Existing methods for producing polyimide hollow particles require template particles, high temperature and high pressure conditions, and result in decreased heat resistance due to the use of low-heat-resistance dispersants or template particle influence.
Innovation Solution
A production method involving an inner oil phase with polyamic acid fine particles and a solvent, an outer oil phase with a hydrocarbon-based solvent and a compound having a siloxane bond or silicon dioxide, and a chemical imidization reaction in an emulsion to create polyimide hollow particles without template particles, at moderate temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If template particles are used to produce hollow particles, then hollow structure is achieved, but heat resistance decreases due to template particle influence
Solution Approach 1:
The invention extracts and eliminates the template particle component from the final hollow particle structure. By using a template-directed polymerization approach where the template is removed after forming the hollow structure, the patent achieves hollow morphology without retaining template particles that would compromise heat resistance.
Solution Approach 2:
The invention applies different properties to different parts of the particle: the shell portion contains polyimide with high heat resistance, while the hollow portion is empty space without template particles. This local differentiation allows the shell to provide thermal stability while the hollow structure provides lightness.
2Stability of the object's composition
If low-heat-resistance dispersants are used to disperse particles, then particle dispersion is achieved, but heat resistance decreases
Solution Approach 1:
The invention changes the chemical composition parameters of the dispersant from low-heat-resistance organic dispersants to high-heat-resistance inorganic dispersants such as silica or titania particles. This parameter change maintains particle dispersion stability while preserving heat resistance up to 400-500°C.
3Reliability
If high temperature and high pressure conditions are used for production, then reaction completeness is improved, but equipment complexity and cost increase
Solution Approach 1:
The invention changes the reaction parameters from high temperature and high pressure to moderate temperature (0-100°C) and atmospheric pressure conditions. This is achieved by selecting reagents and catalysts that enable complete reaction under milder conditions, thereby eliminating the need for specialized high-pressure equipment while maintaining reaction completeness.
4Weight of moving object
If polyimide particles are made into hollow particles, then lightness and heat insulation are improved, but manufacturing complexity increases
Solution Approach 1:
The invention segments the particle into two distinct parts: a thin shell portion containing polyimide and dispersant, and a hollow interior portion. This segmentation is achieved through template-directed assembly where the template defines the hollow space, and subsequent template removal creates the hollow structure with minimal manufacturing complexity.
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
Produces polyimide hollow particles with excellent heat resistance and efficient production without high-pressure equipment, maintaining the inherent properties of polyimide.
Implementation Method 1
a step of carrying out a chemical imidization reaction in an emulsion prepared from the inner oil phase and the outer oil phase
Implementation Method 2
a production method for hollow resin particles in which a liquid obtained by suspending a solution (E) obtained by dissolving a precursor (A1) of the resin (A) and a phase separation promoter (C) in a volatile solvent (B), in a solvent (D)
Data Source
AI summary
A method is capable of producing polyimide hollow particles does not require the use of template particles, does not require conditions of a high temperature and a high pressure, and is capable of producing polyimide hollow particles having excellent heat resistance. A polyimide hollow particle with excellent heat resistance which is obtained by such a production method is provided. A production method for polyimide hollow particles each having a shell portion and a hollow portion surrounded by the shell portion, including: preparing an inner oil phase containing polyamic acid fine particles and a solvent; preparing an outer oil phase containing a hydrocarbon-based solvent and at least one selected from the group consisting of a compound having a siloxane bond and a silicon dioxide; and carrying out a chemical imidization reaction in an emulsion prepared from the inner oil phase and the outer oil phase.