Block Copolymer Resin Composition for Vertical Phase Separation

The patent changes the chemical composition parameters of the block copolymer by introducing fluorinated groups with specific electron-withdrawing capabilities. This modifies the interaction parameter (χ) and degree of polymerization (N) to achieve an optimal χ·N product that provides both sufficient phase separation strength and vertical orientation capability. The fluorinated monomer units (Formula 1) with specific R1 alkyl groups and oxygen/silicon atoms create the desired balance between repulsion force and orientational order.

The patent creates a composite block copolymer structure combining hydrocarbon blocks (Formula 2) with fluorinated blocks (Formula 1). This composite material approach allows the hydrocarbon portion to provide structural framework while the fluorinated portion enhances phase separation through strong dipole-dipole interactions and electron-withdrawing effects, achieving both large structural period and vertical orientation simultaneously.

Instead of increasing N proportionally to increase L0, the patent changes the interaction parameter (χ) by introducing fluorinated monomer units. This allows achieving larger structural periods through enhanced χ values rather than simply increasing polymer chain length, thereby reducing the complexity associated with controlling high molecular weight block copolymers.

The patent substitutes the mechanical approach of increasing chain length (N) with a chemical approach of enhancing intermolecular interactions (χ) through fluorinated groups. This replacement of physical scaling with chemical modification simplifies the control of phase separation patterns while achieving the desired structural period.