Conformable Polymer for Frequency-Selectable Heating
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Solution Overview
Problem
There is a need for materials that can efficiently transduce AC electromagnetic input signals into localized heat in substrates, particularly for applications requiring conformability, biocompatibility, and controlled heat generation, as traditional plastics are primarily insulators and lack the capability for effective heat localization.
Innovation Solution
A composite plastic material is developed by compounding a polymer base resin with additives such as barium titanate and carbon, which provides a high loss tangent and low electrical conductivity, allowing for frequency-selectable heat generation through planar resonator structures or variable electrode spacing, enabling localized heat creation without overheating the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If traditional plastic materials are used as substrate, then the substrate provides good electrical insulation and chemical inertness, but it cannot efficiently transduce AC electromagnetic signals into localized heat
Solution Approach 1:
The patent applies composite materials by combining polymer base resin with electromagnetic signal-transducing additives (such as carbon black, metal particles, or ferrite compounds) to create a substrate that maintains the electrical insulation and chemical inertness of plastic while gaining the ability to efficiently transduce AC electromagnetic signals into localized heat through controlled electrical conductivity pathways
2Temperature
If the substrate material has high electromagnetic energy absorption, then localized heat generation is improved, but the substrate may overheat and melt
Solution Approach 1:
The patent applies local quality by creating spatially non-uniform distribution of electromagnetic signal-transducing additives within the substrate, concentrating heat generation at specific localized regions while maintaining lower temperatures in other areas, thereby achieving targeted heating without overall substrate overheating or melting
Solution Approach 2:
The patent applies parameter changes by controlling the concentration, size, and distribution of electromagnetic signal-transducing additives to adjust the substrate's electromagnetic properties and thermal characteristics, enabling optimization of heat generation intensity while preventing excessive temperature rise that would cause substrate melting
3Adaptability or versatility
If the substrate is made flexible and conformable, then adaptability to different surfaces is improved, but manufacturing precision and material consistency become more difficult to control
Solution Approach 1:
The patent applies composite materials by integrating electromagnetic signal-transducing additives into flexible polymer matrices during the compounding process, ensuring uniform distribution of functional components while maintaining the inherent flexibility and conformability of the base polymer material
Solution Approach 2:
The patent applies flexible shells and thin films by forming the substrate as a flexible polymer composite that can conform to various surface geometries, with the composite structure maintaining material composition consistency through controlled processing methods despite the flexibility requirement
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 composite plastic material effectively generates controlled, localized heat within the substrate, allowing for flexible and conformable heating solutions that can be applied to various applications without risking the substrate's melting, offering advantages in weight, non-corrosiveness, and efficient energy conversion.
Implementation Method 1
a lossy dielectric plastic material, such as can be used to efficiently transduce an AC electromagnetic input signal into localized heat in the substrate
Implementation Method 2
using variable spacing electrodes or a planar resonator structure to selectively address and energize a transducer at a desired location in the substrate along the selected path
Data Source
AI summary
A lossy dielectric heat source transducer or other transducer can be formed using a multi-layer substrate, such as can include a power layer (to receive an applied electromagnetic input signal), a polyurethane or other polymeric electromagnetic energy absorption layer, and a coupling layer therebetween. The absorption layer can be doped with carbon or another dopant material to increase electromagnetic energy absorption. The coupling layer can be doped with barium titanate or another dopant material to focus electromagnetic energy passing through the coupling layer toward the absorption layer. Frequency-selective addressing of particular transducers can include using a plurality of planar resonators, which can be configured to resonate at the same or different specified frequencies of the applied electromagnetic input. Such addressing of such frequency-sensitive structures can permit location-specific actuation of one or more transducers.