Block Copolymer Base Material for Horizontal Phase Separation
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Solution Overview
Problem
Existing base materials using block copolymers with styrene derivatives struggle with vertically oriented phase-separated structures, leading to poor horizontal orientation and adhesion to substrates.
Innovation Solution
A base material containing a block copolymer with specific block compositions, excluding alkyl (meth)acrylate units, and optimized molar ratios, enhances horizontal orientation by improving substrate adhesion through polar groups in the block copolymer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a block copolymer with large period (L0) is used for phase separation, then the phase-separated structure can be formed, but vertically oriented structures are mixed with horizontally oriented structures
Solution Approach 1:
The invention changes the chemical composition parameters of the base material by specifying a block copolymer with particular structural characteristics (no alkyl (meth)acrylate units, specific constituent unit ratios with A1 and A2 blocks). This parameter change in the base material composition enables horizontal orientation of phase-separated structures even when using block copolymers with large period (L0), thereby achieving both phase separation and orientation uniformity.
2Reliability
If a base material is used that does not provide sufficient adhesion, then the phase-separated structure can form, but the adhesion to substrate is poor
Solution Approach 1:
The invention modifies the chemical composition parameters of the base material by specifying a block copolymer containing polar groups (through specific A1 and A2 block compositions) and excluding alkyl (meth)acrylate units. This parameter change simultaneously improves adhesion to substrate and maintains phase separation control, resolving the contradiction between reliability and ease of manufacture.
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 solution enables the formation of phase-separated structures with excellent horizontal orientation and improved adhesion, facilitating controlled nanostructure positioning and orientation.
Implementation Method 1
a technique for processing a finer structure has been demanded. In response to such a demand, a technique has been developed for forming a finer structure by utilizing a phase-separated structure formed by self-organization of a block copolymer
Implementation Method 2
utilizing a phase-separated structure formed by self-organization of a block copolymer in which mutually incompatible blocks are bonded to each other
Implementation Method 3
A base material containing a block copolymer (A) including a block (A1) and a block (A2)... the block copolymer having no constituent unit derived from an alkyl (meth)acrylate... capable of forming a phase-separated structure excellent in horizontal orientation
Data Source
AI summary
A base material capable of forming a phase-separated structure excellent in horizontal orientation. The base material contains a block copolymer including a block (A1) having a constituent unit represented by the following Formula (a1) and a block (A2) having a constituent unit represented by the following Formula (a2), and a molar ratio of the constituent unit of the block (A2) of more than 0 mol % and 40 mol % or less. In Formula (a1), Ra11 represents a hydrogen atom, Ra12 represents a substituent, and n is an integer of 0 to 5; and in Formula (a2), Ra21 represents a hydrogen atom, L1 represents a single bond, and Y1 represents a divalent linking group having 1 to 15 carbon atoms