Multimodal Pore Microparticles via Thermoplastic Straining
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Solution Overview
Problem
Existing methods for forming porous microparticles are complex and inefficient, often requiring multiple steps and volatile solvents, which are undesirable.
Innovation Solution
A thermoplastic composition containing a matrix polymer with dispersed microinclusion and nanoinclusion additives is strained to create a porous network with a multimodal pore distribution, allowing for the formation of microparticles without the need for complex processing or volatile solvents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional methods are used to form porous microparticles, then pore structure can be achieved, but the process becomes complex and inefficient requiring multiple steps and volatile solvents
Solution Approach 1:
The invention extracts and eliminates the volatile solvent step from the traditional pore formation process. Instead of using solvents that require evaporation and multiple washing steps, the method uses a water-soluble porogen that can be removed by simple aqueous extraction, dramatically simplifying the manufacturing process while maintaining precise control over the multimodal pore structure.
Solution Approach 2:
The invention changes the chemical parameter of the porogen from volatile organic solvent to water-soluble compound. This parameter change enables the use of aqueous extraction instead of solvent evaporation, reducing process complexity and eliminating the need for multiple washing and drying steps while preserving the ability to control pore size and distribution.
2Manufacturing precision
If traditional methods are used to form porous microparticles, then pore structure can be achieved, but the process requires multiple washing and drying steps
Solution Approach 1:
The invention removes the time-consuming multiple washing and drying steps by using a water-soluble porogen that can be extracted in a single aqueous washing step. The porous structure is formed by dissolving the water-soluble porogen from the particle matrix, eliminating the need for repeated solvent exchanges and extended drying periods required by traditional volatile solvent methods.
Solution Approach 2:
The water-soluble porogen acts as a temporary, disposable structure that is easily removed after serving its purpose of defining the pore space. Its water solubility allows for rapid extraction without requiring persistent presence in the system, reducing the time the particle must undergo processing steps compared to traditional methods.
3Manufacturing precision
If traditional methods are used to form porous microparticles, then pore structure can be achieved, but volatile solvents must be used which are undesirable
Solution Approach 1:
The invention converts the potential harm of using porogens into a benefit by selecting a water-soluble porogen instead of a volatile organic solvent. The water solubility, which could be seen as a limitation for pore-forming capability, actually becomes an advantage by enabling easy removal through aqueous extraction, eliminating harmful volatile solvent emissions and improving environmental and safety characteristics while maintaining precise pore structure control.
Solution Approach 2:
The invention changes the chemical parameter of the porogen from volatile organic compound to water-soluble compound. This parameter substitution eliminates the harmful effects of volatile solvents (toxicity, flammability, environmental pollution) while maintaining the essential function of pore formation through a safer, more environmentally friendly medium that can be easily removed by water washing.
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 enables the creation of microparticles with a controlled porous structure that enhances tissue formation, cell contact, and active agent delivery, while simplifying the manufacturing process and avoiding the use of volatile solvents.
Implementation Method 1
a porous network is defined in the material that contains a plurality of nanopores and micropores
Implementation Method 2
A thermoplastic composition containing a matrix polymer with dispersed microinclusion and nanoinclusion additives is strained to create a porous network
Data Source
AI summary
Microparticles that have a multimodal pore size distribution are provided, Notably, the pore structure of the present invention can be formed without the need for complex techniques and solvent chemistries traditionally employed to form porous microparticles. Instead, the microparticles contain a polymeric material that is formed from a thermoplastic composition, which is simply strained to a certain degree to achieve the desired porous network structure.