Porous Polyester Material Solid State Drawing
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Solution Overview
Problem
Conventional foaming processes for producing low density polymeric materials result in low mechanical strength and large cell sizes due to the formation of pores in the molten state, preventing strain hardening and leading to breaks in high-speed production processes.
Innovation Solution
A thermoplastic composition comprising a polyester and a copolyetherester elastomer, where the elastomer is dispersed as discrete domains within the polyester, allowing for the formation of a porous network through solid state drawing, creating a plurality of nanopores that enhance mechanical strength and reduce density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If foaming processes are used to create pores in the molten state, then low density is achieved, but mechanical strength deteriorates
Solution Approach 1:
The invention changes the temperature parameter from molten state to solid state during pore formation. By conducting solid state drawing below the melting temperature, the polymer maintains its structural integrity while pores are formed, thereby achieving low density without sacrificing mechanical strength
Solution Approach 2:
The invention utilizes the phase transition from molten state to solid state as the key mechanism. By performing pore formation in the solid state rather than molten state, and controlling the temperature to remain below the melting point during drawing, the material achieves both low density and high mechanical strength through proper phase management
2Quantity of substance
If foaming processes are used to create pores, then low density is achieved, but cell size becomes large
Solution Approach 1:
The invention changes the temperature parameter to enable solid state processing, which allows for precise control of pore formation. This results in small, uniform nanopores (1-100 micrometers) rather than large cells, achieving both low density and high manufacturing precision
Solution Approach 2:
The copolyetherester elastomer domains are pre-dispersed in the polyester matrix before solid state drawing. This preliminary dispersion of domains serves as nucleation sites that control subsequent pore formation, ensuring uniform nanopore distribution and small cell size
3Quantity of substance
If pores are formed in the molten state, then low density is achieved, but molecular orientation is low
Solution Approach 1:
The invention changes the temperature parameter to solid state, enabling molecular orientation during solid state drawing. The polymer chains can reorganize and orient in the solid state while pores form around the dispersed elastomer domains, achieving both low density and high molecular orientation
Solution Approach 2:
The copolyetherester elastomer is pre-dispersed as domains in the polyester matrix before solid state drawing. These pre-positioned domains act as nucleation sites that guide molecular orientation during subsequent solid state drawing, ensuring both low density and high molecular orientation are achieved simultaneously
4Quantity of substance
If large cell sizes are generated, then low density is achieved, but melt strength is reduced
Solution Approach 1:
The invention changes the temperature parameter to solid state processing, eliminating the melt strength problem entirely. By forming pores in the solid state rather than molten state, the material maintains its structural integrity and strength throughout the process, achieving low density without compromising melt strength
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 resulting polymeric material exhibits improved mechanical strength and a stable porous network with nanopores, achieving a low density and high thermal resistance while maintaining processability, unlike conventional methods that result in uncontrolled pore distribution and poor mechanical properties.
Implementation Method 1
The copolyetherester elastomer 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
Implementation Method 2
solid state drawing the thermoplastic composition to form a porous network therein, the porous network including a plurality of nanopores
Data Source
AI summary
A polymeric material that includes a thermoplastic composition containing a continuous phase that includes a polyester and a copolyetherester elastomer is provided. The copolyetherester elastomer 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.