Polymeric Films With Elongate Elements Interconnecting Particles
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Solution Overview
Problem
Conventional film processes struggle to incorporate high volumes of frangible particles, such as glass bubbles, due to mechanical damage during processing, leading to limitations in achieving low dielectric constants and high particle loadings.
Innovation Solution
A film manufacturing process utilizing thermally induced phase separation (TIPS) at elevated temperatures followed by controlled cooling under pressure, forming elongate polymeric elements that interconnect particles, allowing for high particle loadings without damaging them, resulting in a porous structure with low dielectric constant and improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional film processes are used to incorporate particles, then processing is simpler, but particle damage occurs and particle loading is limited
Solution Approach 1:
The patent changes the temperature parameter during processing, using elevated temperatures to soften the polymeric material and reduce its viscosity. This allows particles to be incorporated at high loadings without mechanical damage, as the softened matrix can accommodate particles more gently. The temperature parameter is then reduced to solidify the structure, achieving both high particle loading and particle integrity.
Solution Approach 2:
The patent utilizes phase transitions of the polymeric material, transitioning from a solid or semi-solid state to a softened/melted state during particle incorporation, and then back to a solidified state. This phase change allows the material to temporarily become more accommodating to high particle loadings without causing mechanical damage, then solidifies to maintain structural integrity.
2Quantity of substance
If high volumes of frangible particles are incorporated, then dielectric constant decreases, but mechanical integrity deteriorates
Solution Approach 1:
The patent employs parameter changes in the polymeric material's temperature and viscosity to achieve high particle loadings while maintaining mechanical integrity. By controlling the thermal state during processing, the material can accommodate high particle volumes, and upon cooling, maintains sufficient strength for practical applications.
Solution Approach 2:
The patent creates a composite material system consisting of frangible particles dispersed in a polymeric matrix. This composite structure allows the combination of particles with low dielectric constant and the polymer with good mechanical properties, achieving both low overall dielectric constant and adequate mechanical integrity through proper formulation and processing.
3Loss of energy
If high particle loadings are achieved, then transmission loss is reduced, but processing difficulty increases
Solution Approach 1:
The patent uses parameter changes, specifically temperature elevation, to reduce the viscosity and processing resistance of the polymeric material. This allows high particle loadings to be incorporated more easily, reducing transmission loss while maintaining manufacturability through controlled thermal processing.
Solution Approach 2:
The patent utilizes phase transitions of the polymeric material to facilitate processing of high particle loading composites. The material transitions to a softer phase during processing, enabling easier incorporation of particles, then transitions back to a solid phase to maintain structural integrity, thereby reducing transmission loss without excessive processing difficulty.
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 process enables films with high particle loadings exceeding 50% volume, achieving low dielectric constants and reduced transmission loss, while maintaining flexibility and mechanical integrity, suitable for applications like automotive RADAR units and radomes.
Implementation Method 1
inducing a phase separation of a polymer from a component that is a solvent for the polymer at a higher temperature but not at a lower temperature
Implementation Method 2
a component that is a solvent for the polymer at a higher temperature but not at a lower temperature
Data Source
AI summary
A film includes a polymeric material and a plurality of particles dispersed therein. The polymeric material includes a plurality of elongate polymeric elements oriented along substantially a same first direction and interconnecting the particles. A ratio of a volume of the plurality of particles to a volume of the polymeric material is at least 5. An elongate portion of at least a first elongate polymeric element in the plurality of elongate polymeric elements may conform to and be bonded to a first particle in the plurality of particles along an entire length of the elongate portion. The first elongate polymeric element may extend from the elongate portion at least to a second particle in the plurality of particles.