Polymeric Material Solid State Drawing Nanopores
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Solution Overview
Problem
Conventional foaming processes for producing low density polymeric materials result in low molecular orientation, mechanical weakness, and large cell sizes, limiting their application in high-speed production processes due to strain hardening constraints and poor pore distribution.
Innovation Solution
A thermoplastic composition with a continuous phase containing a matrix polymer and an ultrahigh molecular weight siloxane polymer, dispersed as discrete domains, is subjected to solid state drawing to create a porous network with nanopores, enhancing mechanical strength and pore distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional foaming processes are used to produce low density polymeric materials, then the material density is reduced, but the molecular orientation is low and mechanical strength is compromised
Solution Approach 1:
The patent changes the physical state parameter from molten to solid state during the foaming process. By initiating pore formation in the solid state rather than the molten state, the polymer chains maintain molecular orientation and strain hardening capability, thereby achieving both low density and high mechanical strength simultaneously
Solution Approach 2:
The patent performs preliminary molecular orientation and crystallization in the solid state before pore formation. This preliminary action establishes a structured polymer matrix that can withstand the mechanical stress of pore creation while maintaining strength, rather than forming pores in a disordered molten state
2Quantity of substance
If typical foaming processes are used, then pore structure is created through the bulk, but cell sizes become large (greater than 100 μm)
Solution Approach 1:
The patent introduces a nucleating agent that creates localized pore formation sites throughout the polymer matrix. This local quality approach ensures uniform distribution of small nanopores (0.1-10 μm) rather than large cells, by concentrating pore initiation at specific nucleation points that are evenly dispersed throughout the material
Solution Approach 2:
The patent uses a nucleating agent as an intermediary substance that mediates between the polymer matrix and the pore structure. This nucleating agent provides controlled sites for pore formation, enabling precise control over pore size and distribution while maintaining overall material integrity
3Quantity of substance
If large cell sizes are generated during foaming, then pore structure is established, but melt strength is reduced causing breaks in high speed production
Solution Approach 1:
The patent changes the physical state parameter to solid state during foaming, which maintains melt strength and prevents breaks in high speed production processes. The solid state structure provides mechanical integrity that allows the material to withstand the stresses of rapid processing while still forming the desired porous structure
4Quantity of substance
If foaming occurs in molten state, then pore formation is achieved, but strain hardening is prevented
Solution Approach 1:
The patent changes the physical state parameter from molten to solid state, which enables strain hardening to occur during pore formation. The solid state allows polymer chains to orient and harden under stress, providing both pore structure and enhanced mechanical stability simultaneously
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
The approach results in a polymeric material with a stable porous network, improved mechanical strength, and controlled pore size distribution, enabling the production of materials with reduced density and enhanced thermal resistance.
Implementation Method 1
an ultrahigh molecular weight siloxane polymer having a weight average molecular weight of about 100,000 grams per mole or more that is dispersed within the continuous phase in the form of discrete domains
Implementation Method 2
A porous network is defined within the thermoplastic composition that includes a plurality of nanopores
Implementation Method 3
solid state drawing the thermoplastic composition to form a porous network therein
Implementation Method 4
enhanced thermal resistance
Data Source
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AI summary
A polymeric material that includes a thermoplastic composition containing a continuous phase that includes a matrix polymer and a siloxane component is provided. The siloxane component contains an ultrahigh molecular weight siloxane polymer that is dispersed within the continuous phase in the form of discrete domains. A porous network is defined within the thermoplastic composition that includes a plurality of nanopores.