Porogen Compositions for Uniform Pore Structure
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Solution Overview
Problem
Conventional methods for producing porous materials using porogen scaffolds face challenges in achieving uniform fusion and structure, leading to inconsistent pore sizes and interconnections due to the random melting or fusion of porogens made from single materials.
Innovation Solution
The use of porogen compositions comprising a shell material with a lower melting point and a core material with a higher melting point, allowing controlled fusion to form a uniformly fused porogen scaffold, which is then stabilized and removed to create a porous material with a consistent pore structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thermal treatment is applied to fuse porogens made from single material, then porogen fusion occurs, but uniform fusion and consistent pore structure are not achieved
Solution Approach 1:
The porogen is segmented into two distinct materials: a fusible material (shell) and a non-fusible material (core). This segmentation allows the shell to melt and fuse uniformly during thermal treatment while the core remains intact, providing structural consistency. The segmentation resolves the contradiction by enabling controlled fusion without compromising pore structure uniformity.
Solution Approach 2:
The invention uses composite porogen particles comprising a fusible material shell and a non-fusible material core. This composite structure allows differential behavior during thermal treatment: the shell melts to enable fusion while the core maintains structural integrity. The composite material approach directly addresses the contradiction by combining materials with complementary properties for uniform fusion and consistent pore formation.
2Manufacturing precision
If thermal treatment temperature and time are carefully controlled, then sufficient porogen fusion is achieved, but not all porogens melt at the same time resulting in non-uniform structure
Solution Approach 1:
Different regions of the porogen particle have different properties: the shell is designed to be fusible while the core is non-fusible. This local quality differentiation ensures that during thermal treatment, only the shell material melts and participates in fusion, while the core remains stable. This resolves the reliability issue by making the melting behavior uniform and predictable across all porogens.
Solution Approach 2:
The invention changes the material parameters of the porogen from homogeneous single-material composition to heterogeneous two-material composition with different melting points. By selecting a fusible material with a lower melting point for the shell and a non-fusible material with a higher melting point for the core, the invention ensures uniform melting behavior during thermal treatment, achieving both sufficient fusion and uniform structure.
3Productivity
If porogens are fused to form porogen scaffold, then porous material can be produced, but the random fusion leads to inconsistent pore sizes and interconnections
Solution Approach 1:
The porogen is segmented into fusible shell and non-fusible core, enabling controlled fusion behavior. During thermal treatment, the shell melts uniformly to form consistent interconnections between pores, while the core maintains uniform size and shape. This segmentation allows high productivity through efficient thermal processing while achieving manufacturing precision in pore structure consistency.
Solution Approach 2:
The composite porogen structure with fusible shell and non-fusible core enables simultaneous achievement of productivity and precision. The shell material provides uniform fusion characteristics for consistent pore interconnections, while the core material maintains structural integrity for uniform pore sizes. This composite approach resolves the contradiction between production efficiency and structural consistency.
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 ensures a more uniform and controlled formation of porous materials with consistent pore sizes and interconnections, enhancing their utility in various applications by improving structural integrity and performance.
Implementation Method 1
a porogen composition comprising a shell material and a core material wherein the shell material has a lower melting point than the core material
Implementation Method 2
most porogens are fused using thermal means where the porogens, in the solid phase, are heated to a temperature above the melting point
Data Source
AI summary
Provided are porogen compositions and methods of using such porogen compositions in the manufacture of porous materials, for example, porous silicone elastomers. The porogens generally include comprising a core material and shell material different from the core material. The porogens can be used to form a scaffold for making a resulting porous elastomer when the scaffold is removed.