PA9T and PA6T are two types of semi-aromatic nylons, which exhibit significant differences in performance due to the varying lengths of their diamine carbon chains. Below is a comparison of their main properties: Water absorption and dimensional stability: The water absorption rate of PA9T (0.1%-0.3%) is significantly lower than that of PA6T (0.3%-0.5%), making PA9T exhibit superior dimensional stability in humid environments. This makes it particularly suitable for applications where high dimensional accuracy is required, such as semiconductors and precision electronics.
Chemical resistance and hydrolysis resistance: Due to its longer carbon chain and weaker molecular polarity, PA9T exhibits stronger resistance to polar solvents (such as ketones and esters) and hydrolysis environments. Therefore, it has a longer service life than PA6T in automotive coolant circulation systems and high-temperature, humid industrial equipment.
Heat resistance: Both have similar melting points (PA9T 308°C, PA6T 310-320°C) and heat distortion temperatures (both above 280°C), but PA9T exhibits slightly better creep resistance at high temperatures compared to PA6T.
Mechanical properties: The tensile strength (100-120MPa) and bending strength (150-180MPa) of PA6T are slightly higher than those of PA9T, but PA9T exhibits superior impact strength and toughness, making it less prone to embrittlement, especially in low-temperature environments.
Processing performance: PA9T exhibits better melt flowability and a lower molding shrinkage rate (0.5%-0.8%), making it suitable for the production of thin-walled and precision products; PA6T requires a slightly higher processing temperature and stricter temperature control for the equipment.
Application Scenario: PA9T is primarily used in fields demanding high dimensional stability, such as semiconductor packaging and 5G high-frequency connectors; whereas PA6T is predominantly employed in high-temperature components surrounding automotive engines and general high-end electronic connectors.
In summary, both PA9T and PA6T have their respective advantages, and the choice of material depends on specific application requirements.
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