PLA Copper Clad Laminate Crystallization Control Against Warping
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Solution Overview
Problem
Printed wiring boards containing non-biodegradable resin substrates pose an environmental burden when leaked into nature, and using biodegradable resin like polylactic acid can lead to warping and cracking, which affects the integrity of the copper clad laminate.
Innovation Solution
A copper clad laminate is designed with a resin substrate containing at least 50% polylactic acid, a degree of crystallization between 29% and 36%, and a crystallite size of 19-26 nm, controlled through specific molding conditions to prevent warping and cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a biodegradable resin is used as a material to impart biodegradability to the resin substrate, then the resin substrate can be biodegraded and reduce environmental burden, but the resin substrate can warp and/or crack
Solution Approach 1:
The patent applies parameter changes by precisely controlling the degree of crystallization (29-36%) and crystallite size (19-26 nm) of polylactic acid in the resin substrate. These parameter optimizations enable the substrate to maintain structural integrity while achieving biodegradability, resolving the contradiction between environmental friendliness and reliability
Solution Approach 2:
The patent uses composite materials by combining polylactic acid with other resins in specific ratios (at least 50 mass% polylactic acid). This composite approach allows the resin substrate to exhibit both biodegradability from the polylactic acid component and sufficient mechanical strength to prevent warping and cracking
2Shape
If the degree of crystallization of polylactic acid is increased to reduce warping, then warping is suppressed, but the resin substrate becomes more prone to cracking
Solution Approach 1:
The patent resolves this contradiction by optimizing two parameters simultaneously: degree of crystallization (29-36%) and crystallite size (19-26 nm). This dual-parameter control allows the resin substrate to maintain shape stability while preserving crack resistance, as the controlled crystallite size prevents excessive brittleness even at higher crystallization degrees
3Shape
If the crystallite size of polylactic acid is decreased to prevent warping, then warping is reduced, but the resin substrate becomes more brittle and prone to cracking
Solution Approach 1:
The patent addresses this contradiction by establishing a lower bound for crystallite size (19-26 nm). This parameter constraint ensures that crystallites remain large enough to maintain ductility and crack resistance, while still being small enough to reduce warping. The precise parameter optimization balances shape stability with mechanical strength
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 laminate achieves biodegradability while minimizing warping and cracking, ensuring the laminate's structural integrity and reducing environmental impact.
Implementation Method 1
the degree of crystallization of the polylactic acid calculated on a basis of a result of differential scanning calorimetry being 29% or more and 36% or less
Implementation Method 2
a crystallite size of the polylactic acid calculated on a basis of a result of X-ray diffraction measurement being 19 nm or more and 26 nm or less
Data Source
AI summary
An object of the present technology is to provide a copper clad laminate including a resin substrate that has biodegradability and less likely to warp or crack. The present technology provides a copper clad laminate including: a resin substrate; an adhesive layer; and a copper foil layer, the adhesive layer and the copper foil layer being stacked in this order on at least one side of the resin substrate, the resin substrate containing at least 50 mass % or more of polylactic acid, the degree of crystallization of the polylactic acid calculated on a basis of a result of differential scanning calorimetry being 29% or more and 36% or less, a crystallite size of the polylactic acid calculated on a basis of a result of X-ray diffraction measurement being 19 nm or more and 26 nm or less. Further, the present technology provides a printed wiring board formed using the copper clad laminate.