TLCP Molded Body Plasma Surface Treatment for Adhesion
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Solution Overview
Problem
Thermoplastic liquid crystal polymer (TLCP) molded bodies have poor adhesion properties, particularly when used with adhesives other than epoxy or acrylic, which can compromise the excellent dielectric characteristics of TLCP films.
Innovation Solution
The TLCP molded body is treated with plasma at a high output per unit area for a short processing time, modifying the surface to achieve specific ratios of peak areas based on X-ray photoelectron spectroscopy analysis, thereby enhancing adhesion to a wide range of adhesion targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional plasma treatment is applied to TLCP molded bodies, then adhesion to epoxy or acrylic adhesives is improved, but adhesion to other types of adhesives remains poor and processing time is extended
Solution Approach 1:
The invention changes the plasma treatment parameters by increasing the output per unit area to 3.0 W/cm² or higher and reducing the processing time to 10 seconds or less. This parameter optimization achieves sufficient surface modification for improved adhesion to various adhesives (not limited to epoxy or acrylic) while minimizing processing time, thereby resolving the contradiction between adhesion strength and processing time efficiency
2Strength
If surface treatment is applied to improve adhesion, then adhesion property is enhanced, but the excellent dielectric characteristics of TLCP films may be compromised
Solution Approach 1:
The invention applies surface treatment only to the adherend portion (surface) of the TLCP molded body, leaving the bulk material properties unchanged. The plasma treatment modifies only the surface chemistry to improve adhesion, while the interior TLCP material retains its excellent dielectric characteristics, thus resolving the contradiction between adhesion enhancement and dielectric property preservation
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 modified TLCP molded body exhibits improved initial adhesion and long-term adhesion strength to various adhesives, maintaining high reliability and durability, especially in electronic circuit board applications.
Implementation Method 1
the surface treatment is performed by irradiating plasma to at least an adherend portion of the thermoplastic liquid crystal polymer molded body so as to carry out surface treatment under acidic gas atmosphere
Implementation Method 2
a ratio of the sum of peak intensities of [—C—O— bond] and [—COO— bond] based on a C(1s) peak intensity
Data Source
AI summary
A thermoplastic liquid crystal polymer (TLCP) molded body including a thermoplastic polymer capable of forming an optically anisotropic melt phase. The TLCP molded body includes an adherend portion in at least a part of the TLCP molded body. The adherend portion has a surface satisfying: a ratio <C—O>/<COO> of 1.5 or greater in which the <C—O> represents a proportion of a peak area of [C—O bond] to a C(1s) peak area, and the <COO> represents a proportion of a peak area of [COO bond] based on the C(1s) peak area; and a ratio <C═O>/<COO> of 0.10 or higher in which the <C═O> represents a proportion of a peak area of [C═O bond] based on the C(1s) peak area, and the <COO> represents the proportion of the peak area of the [COO bond] based on the C(1s) peak area in a result of X-ray photoelectron spectroscopy analysis.