Polyamide Block Copolymer Transparency and Strength

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Solution Overview

Problem

There is a need for a colorless transparent material with improved transparency, heat resistance, mechanical strength, and flexibility to meet the demands of miniaturized information devices and high-resolution display devices.

Innovation Solution

A polyamide block copolymer is developed, comprising a first segment with a rigid structure represented by Chemical Formula 1 or 2, and a second segment with a flexible structure represented by Chemical Formula 3, which are combined in specific weight ratios to enhance transparency, heat resistance, and mechanical strength, while maintaining flexibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a colorless transparent material is used for optical applications, then transparency is achieved, but heat resistance and mechanical strength are insufficient

Engineering Contradiction:

ImprovetransparencyVSAvoidmechanical strength

Core Design Contradiction:

Illumination intensityVSStrength

Solution Approach 1:

The patent employs a block copolymer structure comprising a first block with rigid aromatic rings (providing mechanical strength and heat resistance) and a second block with flexible aliphatic chains (providing transparency and flexibility). This composite molecular architecture allows the material to simultaneously achieve high transparency in the visible spectrum while maintaining excellent mechanical properties and thermal stability.

Inventive Principle:

Principle #40Composite materials

2Strength

If material rigidity is increased to improve mechanical strength, then strength improves, but flexibility deteriorates

Engineering Contradiction:

Improvemechanical strengthVSAvoidflexibility

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The polymer is segmented into distinct blocks: rigid aromatic blocks (providing strength) and flexible aliphatic blocks (providing flexibility). This segmentation allows each block to contribute its dominant property while the block copolymer structure integrates them into a unified material that exhibits both high mechanical strength and good flexibility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the polymer chain have different local properties - the aromatic blocks provide localized rigidity and strength, while the aliphatic blocks provide localized flexibility. This local quality differentiation enables the overall material to exhibit both contradictory properties simultaneously.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS8895677B2Polyamide block copolymer, article including same, and display device including the article

Publication Date: 2014.11.25 SAMSUNG ELECTRONICS CO LTD

AI summary

A polyamide block copolymer that includes a first segment including a repeating unit represented by Chemical Formula 1, a repeating unit represented by Chemical Formula 2, or a combination thereof; and a second segment including a repeating unit represented by Chemical Formula 3. The variables R1 to R15, and n1 to n8 are defined herein.