Nano-cellular Polymer Foam Nanoscale Pores
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Solution Overview
Problem
Current polymeric foams have limitations in achieving superior structural, thermal, and dielectric properties while maintaining low weight, with their pore morphology not fully exploited for enhanced performance, and they often become opaque when micro-sized pores are introduced.
Innovation Solution
Development of nano-cellular polymer foams with average pore sizes ranging from 10 nanometers to 500 nanometers and relative densities between 1% to 50% of the bulk density, achieved through a process involving contact with a foaming agent, allowing for superior structural, thermal, and dielectric properties, as well as optical transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pore size is reduced to micrometer level, then structural properties improve, but optical transparency deteriorates
Solution Approach 1:
The patent applies parameter changes by reducing pore size from micrometer to nanometer scale (10-500 nm), which fundamentally alters the light interaction mechanism. At this nanoscale, light scattering is minimized while structural properties are enhanced, resolving the contradiction between strength and transparency
Solution Approach 2:
The invention transitions from conventional micrometer-scale pore structures to nanometer-scale pore structures, representing a dimensional change in the pore size regime. This dimensional shift enables simultaneous achievement of superior structural properties and optical transparency that cannot be obtained at larger scales
2Weight of moving object
If foam density is reduced, then weight decreases, but mechanical strength deteriorates
Solution Approach 1:
The patent changes the pore size parameter to nanometer scale (10-500 nm), which fundamentally alters the relationship between density and strength. The nanoscale pore structure provides exceptional strength-to-density ratio, enabling weight reduction while maintaining or enhancing mechanical strength beyond classical bounds
Solution Approach 2:
The invention creates a composite-like structure with nanoscale pores distributed throughout the polymer matrix, achieving properties that exceed the theoretical bounds for conventional foams. The nano-cellular structure acts as a reinforcement phase that enhances strength while reducing density
3Temperature
If pore size is reduced to nanometer scale, then thermal insulation improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by controlling pore size in the nanometer range (10-500 nm) through specific foaming conditions, achieving superior thermal insulation. The nanoscale pore structure reduces thermal conduction while the manufacturing process, while complex, is managed through controlled foaming agent contact and processing parameters
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 nano-cellular polymer foams exhibit enhanced structural, thermal, and dielectric properties, along with optical transparency, surpassing the classical upper bound of conventional foams, and demonstrate reduced thermal conduction and increased radiation transmission, making them suitable for various applications.
Implementation Method 1
contacting a polymer with a foaming agent
Implementation Method 2
reduced thermal conduction
Data Source
AI summary
A nano-cellular polymer foam is disclosed, which has an average pore size from about 10 nanometers to about 500 nanometers; and a foam density that is from about 1 percent to about 50 percent of the bulk density of the material of the nano-cellular foam.