High Tg Polyamide via 1,3-BAC and Terephthalic Acid
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Standard Polyphthalamides (PPA) suffer from limitations in thermal resistance and mechanical properties at elevated temperatures, primarily due to their glass transition temperature (Tg) which ranges between 80° C. and 140° C., leading to a decline in stiffness, strength, and electrical properties.
Innovation Solution
A new polyamide is developed with a high glass transition temperature (Tg) of at least 165° C., achieved by using a reaction mixture with at least 99.0 mol % of 1,3-bis(aminomethyl) cyclohexane as the diamine component and at least 90.0 mol % of terephthalic acid as the dicarboxylic acid component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If standard PPA-based materials are used, then good mechanical and chemical resistance is achieved at room temperature, but thermal resistance and mechanical properties deteriorate near the glass transition temperature (80-140°C)
Solution Approach 1:
The patent changes the chemical composition parameters of the polyamide by using specific ratios of diamine (at least 99.0 mol % 1,3-bis(aminomethyl) cyclohexane) and dicarboxylic acid (at least 90.0 mol % terephthalic acid) components, which fundamentally alters the glass transition temperature from the conventional 80-140°C range to at least 165°C, thereby resolving the contradiction between achieving high temperature resistance and maintaining mechanical strength
2Temperature
If stabilizers and additives are formulated to improve heat resistance, then thermal stability is enhanced to a certain extent, but mechanical and electrical performance at elevated temperature remains unaffected
Solution Approach 1:
The patent creates a composite polyamide structure by combining specific diamine and dicarboxylic acid components in defined proportions, resulting in a material that inherently achieves both improved heat resistance (Tg ≥ 165°C) and maintained mechanical/electrical performance, eliminating the need for separate stabilizers that fail to improve high-temperature performance
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 resulting polyamide exhibits enhanced thermal stability with a melting temperature of at least 280° C. and high crystallinity, maintaining desirable mechanical, electrical, and chemical resistance even at elevated temperatures.
Implementation Method 1
the temperature of use of any semi-crystalline polymer is dictated by its glass transition temperature which, in the case of PPA, is generally between 80° C. and 140° C.
Implementation Method 2
The polyamide (PA) exhibits a melting temperature of at least 280° C., as measured according to ASTM D3418
Data Source
AI summary
Described herein are polyamides (PA) formed from a reaction mixture (RM) including a diamine component (DA) and a dicarboxylic acid component (DC). The diamine component (DA) includes at least 99 mol % of 1.3-bis (aminomethyl) cyclohexane (“1,3-BAC”) and the dicarboxyic acid component (DC) includes at least 90 mol % of terephthalic acid (“TA”). It was surprisingly found that the polyamides (PA) had and increased glass transition temperature (“Tg”), while maintaining high melting temperatures (“Tm”) and high crystallinity. More particularly, in some embodiments, the polyamides (PA) have a Tg of at least 165° C. a Tm of at least 280° C. and a heat of fusion (“ΔHf”) of at least 20 J/g. Due at least in part to the relative high Tg, Tm and crystallinity (measured by ΔHf), the polyamides (PA) can be advantageously used in high heat application settings, while maintaining desirable mechanical, electrical properties and chemical resistance