Block Copolymer Vertical Alignment on Substrates
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Solution Overview
Problem
Existing block copolymers face challenges in achieving vertical alignment on various substrates without pre-treatment, and their phase separation properties are not efficiently controlled, limiting their applications in nanostructured patterns and devices.
Innovation Solution
The development of a block copolymer that can be vertically aligned on both hydrophobic and hydrophilic surfaces without pre-treatment, achieved by controlling specific parameters such as molecular weights, relative ratios of blocks, and thermal annealing, which enhances self-assembling and phase separation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional block copolymers are used, then they can form phase-separated structures, but they cannot achieve vertical alignment on diverse substrates without pre-treatment
Solution Approach 1:
The patent applies local quality by creating asymmetric block copolymers where one block (first block) has specific functional groups or surface properties that preferentially interact with substrates, while the other block (second block) has different properties. This local differentiation in block properties enables vertical alignment on diverse substrates without pre-treatment, as the first block anchors to the substrate while the second block forms the desired nanostructure.
Solution Approach 2:
The patent employs parameter changes by systematically varying the molecular weight, composition ratio, and chemical structure of the block copolymer blocks to optimize vertical alignment. Specifically, adjusting the ratio of hydrophobic to hydrophilic blocks and their respective molecular weights allows the copolymer to adapt to different substrate surfaces (hydrophobic or hydrophilic) and achieve consistent vertical alignment across diverse substrates.
2Manufacturing precision
If block copolymers are used for nanostructure formation, then various shapes can be prepared, but the phase separation properties are not efficiently controlled
Solution Approach 1:
The patent applies segmentation by dividing the polymer into distinct functional blocks with specific roles: the first block is designed for substrate interaction and anchoring, while the second block is optimized for forming the desired nanostructure (spheres, cylinders, lamellae, etc.). This clear segmentation of functions within the block copolymer structure enables precise control over phase separation behavior and nanostructure formation, as each block independently performs its designated function.
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 block copolymer exhibits excellent self-assembling and phase separation properties, allowing for the formation of nanostructured patterns on diverse substrates with improved vertical alignment, enabling applications in advanced technologies like flash memory and electronic devices.
Implementation Method 1
the block copolymer satisfies at least one parameters as described below, the phase-separation can be very effectively occurred, and therefore it can form a nano-scaled structure by a microphase separation
Implementation Method 2
the vertical alignment may be accomplished with respect to a large area in a short time by a thermal annealing
Data Source
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AI summary
The present application provides the block copolymers and their application. The present application may provide the block copolymers that have excellent self assembling and phase separation properties and therefore that can be effectively used in various applications. The present application may also provide applications of the block copolymers.