Thermosetting Resin Compatibility Evaluation by SEM Phase Analysis
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Solution Overview
Problem
Current methods for evaluating the compatibility of thermosetting resin compositions, such as those used in printed wiring boards, are inadequate as they cannot accurately assess the compatibility between resins and solvents, leading to uncertainties in the cured product's properties, especially in high-frequency and heat-resistant applications.
Innovation Solution
A method involving scanning electron microscopy to evaluate the compatibility by obtaining reflected electronic images of cured products, binarizing the images to calculate the area ratio of non-separation parts, and determining the average domain size of phase-separated regions, providing a quantitative assessment of resin compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If visual transparency evaluation method is used to assess resin compatibility, then the evaluation process is simple and quick, but the measurement precision is insufficient to accurately determine compatibility differences
Solution Approach 1:
The patent replaces the visual inspection method with scanning electron microscopy (SEM) to observe the cross-sectional morphology of cured resin compositions. This substitution of observation method enables quantitative measurement of phase separation through image analysis, significantly improving measurement precision while maintaining operational feasibility through automated image processing
Solution Approach 2:
The patent introduces an image analysis system as an intermediary between the resin composition and the evaluator. By capturing reflected electronic images of the cured product's cross-section and analyzing the area ratio of phase-separated regions, the system provides objective quantitative data that mediates between the physical resin properties and the compatibility assessment
2Reliability
If thermoplastic polymers with no polar groups are used to reduce dielectric tangent, then high-frequency characteristics are improved, but compatibility with other polar resins deteriorates causing separation
Solution Approach 1:
The patent modifies the molecular structure of polyphenylene ether by introducing ethylenically unsaturated bonds, transforming it from a thermoplastic polymer to a thermosetting resin capable of crosslinking. This parameter change in chemical structure enables both low dielectric tangent and improved compatibility with polar resins through covalent bonding networks
Solution Approach 2:
The patent creates a composite resin system combining polyphenylene ether with ethylenically unsaturated bonds and vinyl aromatic compounds. This composite approach allows the non-polar polyphenylene ether backbone to maintain low dielectric properties while the unsaturated bonds enable crosslinking with polar resins, achieving both high-frequency performance and compositional stability
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
This method allows for a more precise evaluation of resin compatibility, enhancing the dielectric characteristics and heat resistance of thermosetting resin compositions, leading to improved performance in high-frequency applications.
Implementation Method 1
obtaining reflected electronic images of cross sections of cured products with a scanning electron microscope
Data Source
AI summary
A method for evaluating the compatibility of a thermosetting resin composition containing at least two kinds of resins and an inorganic filler, the method including the following steps 1A and 2A: Step 1A: a step of obtaining a reflected electronic image of the cross section of a cured product of the thermosetting resin composition using a scanning electron microscope at an observation magnification of 50 to 250 times; and Step 2A: a step in which, in the reflected electronic image, a phase-separated resin region is referred to as a separation part and the remaining region is referred to as a non-separation part, and the image is binarized such that the separation part has one value and the non-separation part has the other value, and the area ratio of the region of the non-separation part of the resultant binarized image to the total region of the binarized image (area of the region of the non-separation part×100/area of the total region of the binarized image) is calculated as the area ratio Rw of the non-separation part.