Polyamide Block Copolymer for Transparent Film
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Solution Overview
Problem
Aromatic polyimide resins face limitations in heat resistance and mechanical properties due to their dark color and high crystallinity, which affects the quality of polyamide films, particularly in thicker forms, and existing solutions fail to balance optical and mechanical properties effectively.
Innovation Solution
A polyamide block copolymer is developed with specific ratios of benzene-1,3-dicarbonyl and benzene-1,4-dicarbonyl groups in its segments, forming amide bonds that enhance mechanical and optical properties, allowing for a flexible and transparent film with improved haze and yellow index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polyamide copolymer is used to improve scratch resistance of polyimide, then mechanical properties are improved, but haze and yellow index are increased due to high crystallinity
Solution Approach 1:
The patent divides the polyamide copolymer into two distinct segments: a first polyamide segment with low crystallinity (benzene-1,3-dicarbonyl group ratio ≤20 mol%) and a second polyamide segment with high crystallinity (benzene-1,3-dicarbonyl group ratio >20 mol%). This segmentation allows each segment to fulfill different functions - the first segment maintains optical properties while the second segment provides mechanical strength, thereby resolving the contradiction between mechanical properties and haze/yellow index
Solution Approach 2:
The patent applies local quality by creating regions with different crystallinity characteristics within the same copolymer structure. The first polyamide segment has low crystallinity to maintain optical clarity, while the second polyamide segment has high crystallinity to provide mechanical strength. This localized differentiation of properties allows simultaneous optimization of both optical and mechanical performance
2Strength
If the film becomes thicker, then mechanical strength is improved, but haze and yellow index increase severely
Solution Approach 1:
The patent segments the polyamide copolymer into two segments with different crystallinity characteristics. The first polyamide segment (with low crystallinity) serves as the base matrix that maintains optical properties even in thicker films, while the second polyamide segment (with high crystallinity) provides mechanical reinforcement. This segmentation enables thicker films to maintain both strength and optical clarity
Data Source
AI summary
The present disclosure relates to a polyamide block copolymer and a polyamide film including the same.The polyamide block copolymer according to the present disclosure makes it possible to provide a polyamide film exhibiting excellent mechanical properties while being colorless and transparent.