Polyamide Film Hansen Solubility for Optical Mechanical Balance
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Solution Overview
Problem
Polyamide-based films used in display applications face a trade-off between optical and mechanical properties, where improvements in mechanical properties often compromise optical properties, and vice versa, necessitating a solution that enhances both while maintaining processing suitability.
Innovation Solution
A polyamide-based film with a dipolar solvent compatibility ranging from 18.5 to 24, as defined by specific Hansen solubility parameters, is developed, which improves wettability and uniformity during post-processing while maintaining excellent optical and mechanical properties, and a dispersible solvent compatibility within a certain range for strong adhesion and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If mechanical properties are improved, then strength and flexibility are enhanced, but optical properties such as transparency and colorlessness deteriorate
Solution Approach 1:
The patent applies parameter changes by precisely controlling the Hansen solubility parameters (δ1d: 13-17, δ1p: 5-13) of the polyamide-based polymer to achieve a dipolar solvent compatibility of 18.5 to 24. This parameter optimization allows the film to maintain both mechanical strength and optical transparency simultaneously, resolving the trade-off between these properties through chemical composition adjustment rather than physical modification
2Illumination intensity
If optical properties are improved, then transparency and colorlessness are enhanced, but mechanical properties such as flexibility and hardness deteriorate
Solution Approach 1:
The patent resolves this contradiction by changing the chemical parameters of the polyamide-based polymer, specifically optimizing the Hansen solubility parameters to achieve the desired balance between optical and mechanical properties
3Ease of manufacture
If wettability is improved during post-processing, then adhesion and uniformity are enhanced, but surface structure may be compromised
Solution Approach 1:
The patent applies parameter changes by optimizing the dipolar solvent compatibility parameter to fall within 18.5 to 24, which enables the film to achieve excellent wettability and adhesion during post-processing while preserving its surface structure and optical properties
Solution Approach 2:
The patent uses solvent compatibility as an intermediary mechanism that mediates between the film's surface properties and the post-processing solution, enabling effective adhesion without compromising the film's structural integrity
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 film achieves enhanced optical properties such as high transmittance, low haze, and low yellow index, along with improved mechanical properties like modulus and flexibility, ensuring excellent adhesion and uniformity during post-processing, suitable for applications in foldable and flexible display devices.
Implementation Method 1
a dipolar solvent compatibility represented by the following Equation 1 is 18.5 to 24. In Equation 1, σd is a value of a dispersible component in surface energy of the polyamide-based film, σp is a value of a polar component in surface energy of the polyamide-based film, δ1d is a value of a dispersible component in Hansen solubility parameter of the dipolar solvent
Data Source
AI summary
The embodiments relate to a polyamide-based film excellent in optical properties, mechanical properties, and processing suitability and to a cover window and a display device comprising the same. The polyamide-based film comprises a polyamide-base polymer, wherein a dipolar solvent compatibility represented by the following equation is 18.5 to 24: Dipolar solvent compatibility=√{square root over ((σd−δ1d)2+(σp−δ1p)2)}. In the equation, σd is a value of a dispersible component in surface energy of the polyamide-based film, σp is a value of a polar component in surface energy of the polyamide-based film, δ1d is a value of a dispersible component in Hansen solubility parameter of the dipolar solvent, and δ1p a value of a dipolar component in Hansen solubility parameter of the dipolar solvent.