Multimodal Pore Polymeric Material for High-Strength Foaming
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Solution Overview
Problem
Conventional methods for producing low density polymeric materials through foaming result in materials with low mechanical strength and large cell sizes, limiting their use in high-speed production processes due to strain hardening issues and uncontrolled pore distribution.
Innovation Solution
A porous polymeric material is created by dispersing first and second inclusion additives within a thermoplastic composition, leading to a multimodal pore size distribution with micropores and nanopores, which enhances mechanical properties and thermal resistance through controlled pore formation and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional foaming processes are used to produce low density polymeric materials, then density is reduced, but mechanical strength deteriorates
Solution Approach 1:
The invention changes the pore size parameters from large (conventional) to a bimodal distribution with micropores (1-10 μm) and nanopores (0.1-1 μm), which fundamentally alters the mechanical properties while maintaining low density. This parameter change resolves the contradiction by showing that smaller, controlled pore sizes can reduce density without compromising strength
Solution Approach 2:
The invention uses specifically designed porous structures with controlled pore size distribution and morphology. The micropore-nanopore hierarchical structure provides both low density and enhanced mechanical strength through improved stress distribution, resolving the contradiction between density reduction and strength maintenance
2Stability of the object's composition
If conventional foaming processes are used, then low molecular orientation is achieved, but strain hardening capability is lost
Solution Approach 1:
The invention changes the processing parameters to maintain molecular orientation above the melting temperature, enabling strain hardening. The controlled pore formation process allows polymer chains to align and orient properly, resolving the contradiction between maintaining molecular orientation and preserving strain hardening capability
3Volume of stationary object
If conventional foaming processes are used, then large cell sizes are generated, but melt strength is reduced
Solution Approach 1:
The invention changes the pore size parameters from large (greater than 100 μm) to a bimodal distribution with micropores (1-10 μm) and nanopores (0.1-1 μm). This parameter change dramatically improves melt strength while maintaining the porous structure, resolving the contradiction between cell size and melt strength
Solution Approach 2:
The invention uses a hierarchical porous structure with controlled morphology and size distribution. The combination of micropores and nanopores provides sufficient structural support to maintain melt strength, resolving the contradiction between pore volume and melt strength
4Ease of manufacture
If conventional foaming processes are used, then uncontrolled pore distribution is achieved, but manufacturing precision deteriorates
Solution Approach 1:
The invention uses pore-forming agents as intermediaries to control pore nucleation and growth. These agents enable precise control over pore size and distribution, transforming the uncontrolled foaming process into a precision manufacturing process, thereby resolving the contradiction between ease of manufacture and manufacturing precision
Data Source
AI summary
A polymeric material having a multimodal pore size distribution is provided. The material is formed by applying a stress to a thermoplastic composition that contains first and second inclusion additives dispersed within a continuous phase that includes a matrix polymer. Through the use of particular types of inclusion additives and careful control over the manner in which such additives are dispersed within the polymer matrix, the present inventors have discovered that a unique, multimodal porous structure can be achieved.