PEKK Polymer Blends With Lower Melting and Rapid Crystallization
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Solution Overview
Problem
Existing PEKK polymers face challenges in processing due to high melting temperatures, which hinder efficient fabrication and require high energy consumption, and there is a need for a PEKK material with a lower melting point that maintains high crystallinity and rapid crystallization to facilitate faster production cycles without compromising mechanical and chemical resistance.
Innovation Solution
A composition comprising a nucleophilic PEKK polymer blended with a second PEKK polymer and an inorganic nucleating agent, achieving a melting point of ≤330°C, high crystallinity, and rapid crystallization, with no cold crystallization upon heating, by controlling the T/I ratio and incorporating a nitride like boron nitride.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional PEKK polymers are used to maintain high crystallinity and high melt temperature for excellent thermal and mechanical properties, then strength, stiffness, and thermal resistance are improved, but processing difficulty increases and energy consumption rises due to high melting temperature requiring fabrication temperatures of at least 380°C
Solution Approach 1:
The patent modifies the chemical composition parameters of PEKK polymers by controlling the terephthalic acid to isophthalic acid (T/I) molar ratio within 65:35 to 75:25 ranges and incorporating specific comonomers to reduce melting temperature from the traditional ~340°C to ≤330°C, enabling lower processing temperatures while maintaining crystallinity and mechanical properties
Solution Approach 2:
The patent creates composite polymer systems by blending different PEKK compositions with varying T/I ratios and incorporating inorganic nucleating agents to achieve a composite material that combines low melting point with high crystallinity and rapid crystallization, resolving the contradiction between processability and mechanical performance
2Reliability
If traditional PEKK polymers are used to ensure high crystallinity and thermal resistance, then chemical and environmental resistance are improved, but production cycle time increases due to slow crystallization rate requiring extended cooling periods
Solution Approach 1:
The patent optimizes compositional parameters including T/I ratio (65:35 to 75:25) and comonomer selection to shift crystallization temperature closer to melting temperature, enabling rapid crystallization during conventional cooling cycles and eliminating the need for extended cooling periods while maintaining full crystallinity and chemical resistance
Solution Approach 2:
The patent introduces inorganic nucleating agents as intermediaries that provide nucleation sites for rapid crystal formation, accelerating the crystallization process and enabling fast production cycles without compromising the high crystallinity needed for chemical and environmental resistance
3Use of energy by stationary object
If PEKK polymer melting temperature is reduced to lower fabrication temperatures and energy consumption, then ease of processing and energy efficiency are improved, but crystallinity and mechanical properties may deteriorate
Solution Approach 1:
The patent carefully adjusts compositional parameters (T/I ratio between 65:35 and 75:25, specific comonomer incorporation) to reduce melting temperature to ≤330°C while simultaneously optimizing crystallization kinetics to ensure high crystallinity is achieved during processing, thereby lowering energy consumption without sacrificing mechanical properties
Solution Approach 2:
The patent exploits phase transition phenomena by engineering the polymer composition to achieve a narrow temperature window between melting and crystallization, allowing the material to transition efficiently from melt to crystalline state during processing, capturing latent heat and ensuring high crystallinity at lower processing temperatures
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 composition enables faster fabrication cycles with reduced energy consumption while maintaining high chemical resistance and mechanical properties, suitable for thermoplastic composites and composite structures.
Implementation Method 1
incorporating a nitride like boron nitride
Data Source
AI summary
The present invention relates to blends of poly(ether ketone ketone) (PEKK) polymers, in particular to certain blends endowed with lower melting point than traditional PEKK polymers, yet maintaining high crystallinity and rapid crystallization behaviour, which are composed of a major amount of a first nucleophilic PEKK having a first T/I ratio, and a minor amount of a second PEKK having a second T/I ratio higher than the first T/I ratio; to methods of making the same, and to uses thereof in various fields.